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Admire Shayanowako is a Post-Doctoral Research Fellow in Plant Breeding at the African Centre for Crop Improvement (ACCI), University of KwaZulu-Natal in South Africa.
Pearl millet (Pennisetum glaucum) is a staple food crop in Burkina Faso that is widely grown in the Sahelian and Sudano-Sahelian zones, characterised by poor soil conditions and erratic rainfall, and high temperatures. The objective of this study was to document farmers’ perceptions of the prevailing constraints affecting pearl millet production and related approaches to manage the parasitic weeds S. hermonthica. The study was conducted in the Sahel, Sudano-Sahelian zones in the North, North Central, West Central, Central Plateau, and South Central of Burkina Faso. Data were collected through a structured questionnaire and focus group discussions involving 492 participant farmers. Recurrent drought, S. hermonthica infestation, shortage of labour, lack of fertilisers, lack of cash, and the use of low-yielding varieties were the main challenges hindering pearl millet production in the study areas. The majority of the respondents (40%) ranked S. hermonthica infestation as the primary constraint affecting pearl millet production. Respondent farmers reported yield losses of up to 80% due to S. hermonthica infestation. 61.4% of the respondents in the study areas had achieved a mean pearl millet yields of <1 t/ha. Poor access and the high cost of introduced seed, and a lack of farmers preferred traits in the existing introduced pearl millet varieties were the main reasons for their low adoption, as reported by 32% of respondents. S. hermonthica management options in pearl millet production fields included moisture conservation using terraces, manual hoeing, hand weeding, use of microplots locally referred to as ‘zaï’, crop rotation and mulching. These management techniques were ineffective because they do not suppress the below ground S. hermonthica seed, and they are difficult to implement. Integrated management practices employing breeding for S. hermonthica resistant varieties with the aforementioned control measures could offer a sustainable solution for S. hermonthica management and improved pearl millet productivity in Burkina Faso.
Armel Rouamba; Hussein Shimelis; Inoussa Drabo; Mark Laing; Prakash Gangashetty; Isack Mathew; Emmanuel Mrema; Admire Shayanowako. Constraints to Pearl Millet (Pennisetum glaucum) Production and Farmers’ Approaches to Striga hermonthica Management in Burkina Faso. Sustainability 2021, 13, 8460 .
AMA StyleArmel Rouamba, Hussein Shimelis, Inoussa Drabo, Mark Laing, Prakash Gangashetty, Isack Mathew, Emmanuel Mrema, Admire Shayanowako. Constraints to Pearl Millet (Pennisetum glaucum) Production and Farmers’ Approaches to Striga hermonthica Management in Burkina Faso. Sustainability. 2021; 13 (15):8460.
Chicago/Turabian StyleArmel Rouamba; Hussein Shimelis; Inoussa Drabo; Mark Laing; Prakash Gangashetty; Isack Mathew; Emmanuel Mrema; Admire Shayanowako. 2021. "Constraints to Pearl Millet (Pennisetum glaucum) Production and Farmers’ Approaches to Striga hermonthica Management in Burkina Faso." Sustainability 13, no. 15: 8460.
Sorghum [Sorghum bicolor (L.) Moench] is the main food staple grain widely cultivated in sub-Sharan Africa including Uganda. There is a lack of current information on sorghum production constraints and varietal trait preferences in the major sorghum production areas in Uganda. Therefore, the objective of this study was to assess the sorghum production constraints and farmer preferences for sorghum variety in Uganda. A participatory rural appraisal study was undertaken in four selected sorghum production districts in Uganda (Kumi, Bukedea, Oyam and Gulu). Data were collected through surveys using semi-structured questionnaires and focus group discussion involving 128 and 55 participants, respectively. Data were subjected to parametric and non-parametric statistical analyses to draw inferences. A lack of improved sorghum varieties was the major sorghum production constraint reported by 82.8% of participants. Farmer preferred ideal sorghum varieties were short to medium plant height with high grain yield. The quality attributes mostly preferred by farmers were baking quality, nutrition, and seed colour. Farmers in the study areas mainly grew unimproved sorghum varieties with low food values. Overall, the study provides the current evidence on sorghum production constraints and farmer-preferred attributes that will guide sorghum nutritional quality breeding with farmer preferred traits.
Charles Andiku; Hussein Shimelis; Mark Laing; Admire Isaac Tichafa Shayanowako; Michael Adrogu Ugen; Eric Manyasa; Chris Ojiewo. Assessment of sorghum production constraints and farmer preferences for sorghum variety in Uganda: implications for nutritional quality breeding. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 2021, 1 -13.
AMA StyleCharles Andiku, Hussein Shimelis, Mark Laing, Admire Isaac Tichafa Shayanowako, Michael Adrogu Ugen, Eric Manyasa, Chris Ojiewo. Assessment of sorghum production constraints and farmer preferences for sorghum variety in Uganda: implications for nutritional quality breeding. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science. 2021; ():1-13.
Chicago/Turabian StyleCharles Andiku; Hussein Shimelis; Mark Laing; Admire Isaac Tichafa Shayanowako; Michael Adrogu Ugen; Eric Manyasa; Chris Ojiewo. 2021. "Assessment of sorghum production constraints and farmer preferences for sorghum variety in Uganda: implications for nutritional quality breeding." Acta Agriculturae Scandinavica, Section B — Soil & Plant Science , no. : 1-13.
Ethiopia is one of the centers of genetic diversity of sesame (Sesamum indicum L.). The sesame genetic resources present in the country should be explored for local, regional, and international genetic improvement programs to design high-performing and market-preferred varieties. This study’s objective was to determine the extent of genetic variation among 100 diverse cultivated sesame germplasm collections of Ethiopia using phenotypic traits and simple sequence repeat (SSR) markers to select distinct and complementary genotypes for breeding. One hundred sesame entries were field evaluated at two locations in Ethiopia for agro-morphological traits and seed oil content using a 10 × 10 lattice design with two replications. Test genotypes were profiled using 27 polymorphic SSR markers at the Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences. Analysis of variance revealed significant (p ≤ 0.05) entry by environment interaction for plant height, internode length, number of secondary branches, and grain yield. Genotypes such as Hirhir Kebabo Hairless-9, Setit-3, Orofalc ACC-2, Hirhir Humera Sel-6, ABX = 2-01-2, and Setit-1 recorded grain yield of >0.73 ton ha−1 with excellent performance in yield component such as oil yield per hectare. Grain yield had positive and significant (p< 0.01) associations with oil yield (r = 0.99), useful for simultaneous selection for yield improvement in sesame. The SSR markers revealed gene diversity and polymorphic information content values of 0.30 and 0.25, respectively, showing that the tested sesame accessions were genetically diverse. Cluster analysis resolved the accessions into two groups, while population structure analysis revealed four major heterotic groups, thus enabling selection and subsequent crossing to develop breeding populations for cultivar development. Based on phenotypic and genomic divergence, the following superior and complementary genotypes: Hirhir Humera Sel-6, Setit-3, Hirhir Kebabo Hairless Sel-4, Hirhir Nigara 1st Sel-1, Humera-1 and Hirhir Kebabo Early Sel-1 (from cluster II-a), Hirhir kebabo hairless-9, NN-0029(2), NN0068-2 and Bawnji Fiyel Kolet, (from cluster II-b). The selected genotypes will serve as parents in the local breeding program in Ethiopia.
Desawi Teklu; Hussein Shimelis; Abush Tesfaye; Jacob Mashilo; Xiurong Zhang; Yanxin Zhang; Komivi Dossa; Admire Shayanowako. Genetic Variability and Population Structure of Ethiopian Sesame (Sesamum indicum L.) Germplasm Assessed through Phenotypic Traits and Simple Sequence Repeats Markers. Plants 2021, 10, 1129 .
AMA StyleDesawi Teklu, Hussein Shimelis, Abush Tesfaye, Jacob Mashilo, Xiurong Zhang, Yanxin Zhang, Komivi Dossa, Admire Shayanowako. Genetic Variability and Population Structure of Ethiopian Sesame (Sesamum indicum L.) Germplasm Assessed through Phenotypic Traits and Simple Sequence Repeats Markers. Plants. 2021; 10 (6):1129.
Chicago/Turabian StyleDesawi Teklu; Hussein Shimelis; Abush Tesfaye; Jacob Mashilo; Xiurong Zhang; Yanxin Zhang; Komivi Dossa; Admire Shayanowako. 2021. "Genetic Variability and Population Structure of Ethiopian Sesame (Sesamum indicum L.) Germplasm Assessed through Phenotypic Traits and Simple Sequence Repeats Markers." Plants 10, no. 6: 1129.
Striga species cause significant yield loss in maize varying from 20 to 100%. The aim of the present study was to screen and identify maize genotypes with partial resistance to S. hermonthica (Sh) and S. asiatica (Sa) and compatible with Fusarium oxysporum f. sp. strigae (FOS), a biocontrol agent. Fifty-six maize genotypes were evaluated for resistance to Sh and Sa, and FOS compatibility. Results showed that FOS treatment significantly (p< 0.001) enhanced Striga management compared to the untreated control under both Sh and Sa infestations. The mean grain yield was reduced by 19.13% in FOS-untreated genotypes compared with a loss of 13.94% in the same genotypes treated with FOS under Sh infestation. Likewise, under Sa infestation, FOS-treated genotypes had a mean grain yield reduction of 18% while untreated genotypes had a mean loss of 21.4% compared to the control treatment. Overall, based on Striga emergence count, Striga host damage rating, grain yield and FOS compatibility, under Sh and Sa infestations, 23 maize genotypes carrying farmer preferred traits were identified. The genotypes are useful genetic materials in the development of Striga-resistant cultivars in Tanzania and related agro-ecologies.
John Lobulu; Hussein Shimelis; Mark Laing; Arnold Mushongi; Admire Shayanowako. Characterization of Maize Genotypes (Zea mays L.) for Resistance to Striga asiatica and S. hermonthica and Compatibility with Fusarium oxysporum f. sp. strigae (FOS) in Tanzania. Agronomy 2021, 11, 1004 .
AMA StyleJohn Lobulu, Hussein Shimelis, Mark Laing, Arnold Mushongi, Admire Shayanowako. Characterization of Maize Genotypes (Zea mays L.) for Resistance to Striga asiatica and S. hermonthica and Compatibility with Fusarium oxysporum f. sp. strigae (FOS) in Tanzania. Agronomy. 2021; 11 (5):1004.
Chicago/Turabian StyleJohn Lobulu; Hussein Shimelis; Mark Laing; Arnold Mushongi; Admire Shayanowako. 2021. "Characterization of Maize Genotypes (Zea mays L.) for Resistance to Striga asiatica and S. hermonthica and Compatibility with Fusarium oxysporum f. sp. strigae (FOS) in Tanzania." Agronomy 11, no. 5: 1004.
The economic potential of African leafy vegetables (ALVs) remains obscured by a poorly developed value chain. This scoping review assembled and examined scattered knowledge generated on ALVs across southern Africa, focusing on production, processing, marketing, and consumption. Two electronic databases (Scopus and Web of Science) were screened, and a total of 71 relevant studies were included and evaluated. The review provides a state of the art on knowledge related to utilisation of ALVs across the entire value chain. The findings show that functional properties are of prime importance in the production and consumption of ALVs. However, the lack of improved germplasm and a non-existent seed supply system are significant production bottlenecks. Pests and diseases affecting the productivity of ALVs remain mostly unexplored. Sun-drying and boiling were the most reported post-harvest processing methods, suggesting that traditional processing methods are still prominent. Many studies also confirmed the predominance of informal markets in the trading of ALVs as they fail to penetrate formal markets because of poor product positioning and exclusion from produce demand and supply forecasts. The inception of cultivar development, mechanised processing methods, and market linkages will enhance the profitability of ALVs in the region. This review enhances the gaining of insight into the state of different value chain components will assist in upscaling production, value addition of products, and enhance marketing efficiency. There is a great opportunity for basic and applied research into ALVs.
Admire Shayanowako; Oliver Morrissey; Alberto Tanzi; Maud Muchuweti; Guillermina Mendiondo; Sean Mayes; Albert Modi; Tafadzwanashe Mabhaudhi. African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review. Sustainability 2021, 13, 2896 .
AMA StyleAdmire Shayanowako, Oliver Morrissey, Alberto Tanzi, Maud Muchuweti, Guillermina Mendiondo, Sean Mayes, Albert Modi, Tafadzwanashe Mabhaudhi. African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review. Sustainability. 2021; 13 (5):2896.
Chicago/Turabian StyleAdmire Shayanowako; Oliver Morrissey; Alberto Tanzi; Maud Muchuweti; Guillermina Mendiondo; Sean Mayes; Albert Modi; Tafadzwanashe Mabhaudhi. 2021. "African Leafy Vegetables for Improved Human Nutrition and Food System Resilience in Southern Africa: A Scoping Review." Sustainability 13, no. 5: 2896.
Background Ethiopia is one of the centres of genetic diversity of sesame (Sesamum indicum L.). The sesame genetic resources present in the country should be explored for local, regional and international sesame improvement programs to design high performing and market preferred varieties. This study's objectives were to determine the extent of genetic variation among 100 diverse cultivated sesame germplasm collections of Ethiopia using phenotypic traits and simple sequence repeat (SSR) markers to select distinct and complementary specimens for breeding. One-hundred sesame entries were field evaluated at two locations in Ethiopia for agro-morphological traits and seed oil content using a 10 × 10 lattice design with two replications. Test specimens were profiled using 27 selected polymorphic SSR markers. Results The analysis of variance revealed significant (P ≤ 0.05) entry by environment interaction for plant height, internode length, number of secondary branches, and seed yield. Genotypes such as Hirhir Kebabo Hairless-9, Setit-3, Orofalc ACC-2, Hirhir Humera Sel-6, ABX=2-01-2, and Setit-1 recorded higher grain yield of > 0.73 ton ha-1 with excellent performance in yield component such as oil and seed yield per hectare. Seed yield had positive and significant (p < 0.01) associations with oil yield (r = 0.99) useful for simultaneous selection for yield improvement in sesame. The SSR markers revealed gene diversity and polymorphic information content of 0.30 and 0.25, respectively, showing that the tested sesame accessions were genetically diverse. Cluster analysis resolved the accessions into two groups, while population structure analysis revealed four major heterotic groups, this enabling selection and subsequent crosses to develop breeding populations for cultivar development.Conclusions Based on phenotypic and genomic divergence, the following complementary specimens were selected: Hirhir Humera Sel-6, Setit-3, Hirhir Kebabo Hairless Sel-4, Hirhir Nigara 1st Sel-1, Humera-1 and Hirhir Kebabo Early Sel-1 (from cluster II-a), Hirhir kebabo hairless-9, NN-0029(2), NN0068-2 and Bawnji Fiyel Kolet, (from cluster II-b). The selected genetic resources are recommended for use in sesame production and breeding programs in Ethiopia.
Desawi Hdru Teklu; Hussein Shimelis; Abush Tesfaye; Jacob Mashilo; Xiurong Zhang; Yanxin Zhang; Komivi Dossa; Admire Shayanowako. Genetic Variability and Population Structure of Ethiopian Sesame (Sesamum Indicum L.) Germplasm Assessed Through Phenotypic Traits and Simple Sequence Repeats Markers. 2021, 1 .
AMA StyleDesawi Hdru Teklu, Hussein Shimelis, Abush Tesfaye, Jacob Mashilo, Xiurong Zhang, Yanxin Zhang, Komivi Dossa, Admire Shayanowako. Genetic Variability and Population Structure of Ethiopian Sesame (Sesamum Indicum L.) Germplasm Assessed Through Phenotypic Traits and Simple Sequence Repeats Markers. . 2021; ():1.
Chicago/Turabian StyleDesawi Hdru Teklu; Hussein Shimelis; Abush Tesfaye; Jacob Mashilo; Xiurong Zhang; Yanxin Zhang; Komivi Dossa; Admire Shayanowako. 2021. "Genetic Variability and Population Structure of Ethiopian Sesame (Sesamum Indicum L.) Germplasm Assessed Through Phenotypic Traits and Simple Sequence Repeats Markers." , no. : 1.
Genotype-by-environment interaction (GEI) analysis is fundamental in crop improvement programmes to guide selection and for recommendation of high performing and stable genotypes for breeding or production. The objectives of this study were to quantify the GEI effects and determine grain yield stability among diverse pigeonpea genotypes to select candidate lines for breeding in Malawi. Eighty-one pigeonpea genotypes were tested under six environments using a 9 × 9 alpha-lattice design with two replications. Data collected were subjected to additive main effects and multiplicative interaction (AMMI) analysis and genotype plus genotype-by-environment interaction (GGE) biplot analysis. Genotype, environment, and genotype × environment interaction (GEI) accounted for 16.4, 33.5, and 49.6%, respectively, of the total variation for grain yield. The test environments were delineated into three mega-environments, based on site and seasonal variability. The AMMI and GGE analyses indicated that the top-yielding and stable genotypes across the test environments were MWPLR 24, ICEAP 01155, MWPLR 14, TZA 5582, and MWPLR 4. The selected genotypes are recommended as parental lines for grain yield improvement in Malawi or similar agro-ecologies.
Esnart Nyirenda Yohane; Hussein Shimelis; Mark Laing; Isack Mathew; Admire Shayanowako. Genotype-by-environment interaction and stability analyses of grain yield in pigeonpea [Cajanus cajan (L.) Millspaugh]. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 2021, 1 -11.
AMA StyleEsnart Nyirenda Yohane, Hussein Shimelis, Mark Laing, Isack Mathew, Admire Shayanowako. Genotype-by-environment interaction and stability analyses of grain yield in pigeonpea [Cajanus cajan (L.) Millspaugh]. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science. 2021; ():1-11.
Chicago/Turabian StyleEsnart Nyirenda Yohane; Hussein Shimelis; Mark Laing; Isack Mathew; Admire Shayanowako. 2021. "Genotype-by-environment interaction and stability analyses of grain yield in pigeonpea [Cajanus cajan (L.) Millspaugh]." Acta Agriculturae Scandinavica, Section B — Soil & Plant Science , no. : 1-11.
Striga presents a major threat to cereal crop production in sub-Saharan Africa. A combined use of host resistance and biological control agents holds promise as a key strategy for sustainable, integrated Striga management in maize (Zea mays L.) production. The objective of this study was to determine resistance against Striga asiatica (L.) Kuntze and compatibility of selected maize genotypes to a biocontrol agent, Fusarium oxysporum f.sp. strigae (FOS), for integrated Striga management. Eighteen maize genotypes were evaluated under glasshouse and field conditions using three treatments: 1) maize genotypes sown without Striga infestation and FOS treatment (control), 2) maize genotypes grown under Striga infestation and; 3) FOS-treated maize genotypes grown under Striga infestation. The results showed that genotype-by-FOS interaction significantly (P < 0.05) affected all traits, except anthesis-to-silking interval, ear aspect score and Striga emergence count at 8 weeks after planting. All maize and Striga traits were significantly affected by FOS treatment (P < 0.001), although the efficacy of FOS seemed to be maize genotype dependent. Mean grain yield was 4.2 t ha−1 for the control, 2.63 t ha−1 for the FOS-treated and 2.17 t ha−1 for the untreated genotypes. Overall, the combined effect of host resistance and inoculation of seed with FOS reduced parasitic infestations and Striga damage symptoms, resulting in improved agronomic performance. Five genotypes (ZM1523, ZM 1423, ZM 1421, NC QPM and Colorado) showed resistance to S. asiatica and compatibility to FOS. The study demonstrated the efficacy of host resistance and biological control in integrated management of S. asiatica in maize.
Admire I. T. Shayanowako; Hussein Shimelis; Mark D. Laing; Learnmore Mwadzingeni. Striga resistance and compatibility of maize genotypes to a biocontrol agent, Fusarium oxysporum f.sp.strigea. Journal of Crop Improvement 2020, 34, 437 -454.
AMA StyleAdmire I. T. Shayanowako, Hussein Shimelis, Mark D. Laing, Learnmore Mwadzingeni. Striga resistance and compatibility of maize genotypes to a biocontrol agent, Fusarium oxysporum f.sp.strigea. Journal of Crop Improvement. 2020; 34 (4):437-454.
Chicago/Turabian StyleAdmire I. T. Shayanowako; Hussein Shimelis; Mark D. Laing; Learnmore Mwadzingeni. 2020. "Striga resistance and compatibility of maize genotypes to a biocontrol agent, Fusarium oxysporum f.sp.strigea." Journal of Crop Improvement 34, no. 4: 437-454.
The South African sugar industry develops commercial sugarcane cultivars across multiple testing sites, crop-years and replications. The extent of such parameters has not been well quantified for optimum breeding and resource allocation. The objective of this study was to identify the optimum number of testing sites, crop-years and replications needed to maximize efficiency of post-release cultivar evaluations in South Africa. Ten commercial sugarcane varieties were evaluated in randomized block designs across five regions tested over five crop cycles. The study was conducted from the main plant to third ratoon crops across the locations. The general linear model was used to estimate variance components. Genotype × location (G×L) interactions were significant (p ≤ 0.01) for cane yield (TCANE), estimated recoverable crystal content (ERC), sugar yield (TERC) and fibre (F). Tonnes of estimated recoverable crystal were highly influenced by G×L interaction, suggesting that evaluating cultivars across locations is essential. High broad sense heritability estimates were observed for TCANE (71.17%), ERC (97.11%) and F % (93.11%), implying that these traits were genetically controlled. The G×L and G×L×C variances were the largest source of variation, suggesting that the evaluation of sugarcane cultivars across locations as opposed to crop cycles would be essential.
Sbongeleni Warren Duma; Hussein Shimelis; Sanesh Ramburan; Admire Isaac Tichafa Shayanowako. Optimising the number of test sites, crop-years and replications to maximize post-release testing efficiencies. South African Journal of Plant and Soil 2020, 37, 61 -70.
AMA StyleSbongeleni Warren Duma, Hussein Shimelis, Sanesh Ramburan, Admire Isaac Tichafa Shayanowako. Optimising the number of test sites, crop-years and replications to maximize post-release testing efficiencies. South African Journal of Plant and Soil. 2020; 37 (1):61-70.
Chicago/Turabian StyleSbongeleni Warren Duma; Hussein Shimelis; Sanesh Ramburan; Admire Isaac Tichafa Shayanowako. 2020. "Optimising the number of test sites, crop-years and replications to maximize post-release testing efficiencies." South African Journal of Plant and Soil 37, no. 1: 61-70.
Genetic diversity is a pre-requisite for rice (Oryza sativa L.) breeding and population development. Hence, the objective of this study was to assess the genetic diversity and population structure of 54 rice accessions using 14 polymorphic simple sequence repeats (SSR) markers to select unique parents for breeding. Data analysis was based on marker and population genetic parameters. The mean polymorphic information content (PIC) was 0.61 suggesting high polymorphisms for the selected SSR markers among the rice accessions. The population structure revealed a narrow genetic base with only two major sub-populations. Analysis of molecular variance revealed that only 30% of the variation was attributed to population differences while 47% and 23% were due to variation among individuals within populations and within individual variation, respectively. The genetic distance and identity among genotypes varied from 0.083 to 1.834 and 0.159 to 0.921, respectively. Dendrogram grouped the genotypes into three clusters with wide variation among the accessions. The study established the existence of considerable genetic diversity among the tested 54 accessions. The selected genetic resources will be useful resources for rice breeding in Tanzania or other African countries.
William Titus Suvi; Hussein Shimelis; Mark Laing; Isack Mathew; Admire Isaac Tichafa Shayanowako. Assessment of the genetic diversity and population structure of rice genotypes using SSR markers. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 2019, 70, 76 -86.
AMA StyleWilliam Titus Suvi, Hussein Shimelis, Mark Laing, Isack Mathew, Admire Isaac Tichafa Shayanowako. Assessment of the genetic diversity and population structure of rice genotypes using SSR markers. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science. 2019; 70 (1):76-86.
Chicago/Turabian StyleWilliam Titus Suvi; Hussein Shimelis; Mark Laing; Isack Mathew; Admire Isaac Tichafa Shayanowako. 2019. "Assessment of the genetic diversity and population structure of rice genotypes using SSR markers." Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 70, no. 1: 76-86.
Sugarcane (Saccharum spp.) yields in the South African sugar industry are affected largely by genotype by environment (G × E) interactions. The objectives of this study were to investigate the nature and magnitude of G × E interactions of selected sugarcane genotypes based on regional evaluation trials and to identify mega-environments to inform future testing strategies. The study was conducted across five regions in KwaZulu-Natal province. Ten sugarcane hybrids and one commercial check hybrid were evaluated using a randomized complete block design with four replications. Data collected were analyzed using the additive main effect and multiplicative interaction (AMMI 2) and genotype main effect plus genotype by environment interaction (GGE) bi-plot analyses. A combined analysis of variance detected significant variation for genotypes, locations, and crop year and their interactions for total cane yield, estimated recoverable crystal and sugar yield. Genotypes N19 and N40 showed broad adaptability for cane and sugar yields, whereas N51 and N12 were superior for sucrose percentage. High cane yields were achieved in the following environments: South Coast, North Coast, Hinterland and irrigated North regions. Overall, the Irrigated North region was the most suitable environment for discriminating among cultivars and for being a representative test environment. Two mega-environments (MGE) were identified for the industry; where Midland and Hinterland sites fell in the same MGE 1; and North Coast, South Coast, and Irrigated North were combined into MGE 2.
Sbongeleni W. Duma; Hussein Shimelis; Sanesh Ramburan; Admire I.T. Shayanowako. Genotype-by-region interactions of released sugarcane varieties for cane yield in the South African sugar industry. Journal of Crop Improvement 2019, 33, 478 -504.
AMA StyleSbongeleni W. Duma, Hussein Shimelis, Sanesh Ramburan, Admire I.T. Shayanowako. Genotype-by-region interactions of released sugarcane varieties for cane yield in the South African sugar industry. Journal of Crop Improvement. 2019; 33 (4):478-504.
Chicago/Turabian StyleSbongeleni W. Duma; Hussein Shimelis; Sanesh Ramburan; Admire I.T. Shayanowako. 2019. "Genotype-by-region interactions of released sugarcane varieties for cane yield in the South African sugar industry." Journal of Crop Improvement 33, no. 4: 478-504.