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Dr. Mahmoud Gaballah
Rice Research & Training Center, Field Crops Research Institute, Agricultural Research Center, Egypt.

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Research Keywords & Expertise

0 Agronomy
0 Ecology
0 Plant Breeding
0 plant genetic resources
0 Abiotic stress

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Short Biography

• Abilities to execute job duties including plan experiments based on the discussion with the breeding team, conduct experiments in field, greenhouse and laboratory, to achieve a specific molecular breeding outcome, carry out experimental plans including statically experiments design, data collection and result analysis, report and discuss results and having good scientific writing skill. Conducted breeding methods, such as conventional breeding, pedigree method, MAS selection method, Single seed descent method, mutation, pure line and hybrid seed technology. • Molecular mapping, phenotype selection, molecular marker assisted selection, and gene cloning tissue culture, marker-Assisted Selection, QTL/gene discovery, marker development and genomic selection model development. • Rice breeding for release new varieties suitable for breeding objective, high yield potential with high sustainable, early maturing, short stature, low input, increase grain nutrition, resistance for common pests, diseases (blast, brown spot and false smut) and insects (stem borer leaf miner); short stature and superior grain quality i.e. bold grain shape, high translucency, milling outturn % and focusing on the elucidation of molecular mechanisms underlying the starch biosynthesis in rice and genetic improvement of rice grain quality. Developing varieties adapted to adverse conditions (drought, salinity, Alkaline and heat stress).

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Journal article
Published: 15 March 2021 in Sustainability
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Hybrid seed set on the female line depends primarily on its flowering synchronization with the restorer line (R), therefore, the sowing of male and female lines must be planned properly to achieve this. Field experiments on different sowing dates (May 1st, May 15th, and May 30th) of R lines (Giza 178R, Giza 179R, and Giza 181R) and cytoplasmic male sterile (CMS) lines (IR69625A, IR70368A, IR58025A, K17A, and G46A) were carried out at the farm of Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt during 2019 and 2020 to study the effect of sowing dates on flowering synchronization in hybrid rice. The results indicated that the synchronization of flowering between CMS lines and R lines has highly significant effects on the days to 50% heading, number of leaves, effective accumulated temperature (EAT), plant height, panicle exertion percentage, panicle length, number of fertile panicles, panicle weight, seed set percentage, harvest index and seed yield of hybrid rice. The highest seed yield (1.72 and 1.41 t ha−1, respectively in 2019 and 2020) was recorded from the sowing date May 1st and the hybrid combination of Giza 178R × IR58025A (2.06 and 2.12 t ha−1 in 2019 and 2020, respectively). The grain yield had a significant and highly significant positive correlation with the plant height (cm), panicle exertion percentage, panicle length, number of panicles plant−1, panicle weight, seed set percentage, and harvest index. In Egypt, May 1st is the best time for the synchronization of hybrid rice lines and a combination of Giza 178R × IR58025A may be recommended for better performance.

ACS Style

Mahmoud Gaballah; Hassan Hamad; Atif Bamagoos; Hesham Alharby; Sharif Ahmed; Ismail Ismail; Sohidul Islam; Ayman EL Sabagh. Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates. Sustainability 2021, 13, 3229 .

AMA Style

Mahmoud Gaballah, Hassan Hamad, Atif Bamagoos, Hesham Alharby, Sharif Ahmed, Ismail Ismail, Sohidul Islam, Ayman EL Sabagh. Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates. Sustainability. 2021; 13 (6):3229.

Chicago/Turabian Style

Mahmoud Gaballah; Hassan Hamad; Atif Bamagoos; Hesham Alharby; Sharif Ahmed; Ismail Ismail; Sohidul Islam; Ayman EL Sabagh. 2021. "Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates." Sustainability 13, no. 6: 3229.

Journal article
Published: 24 December 2020 in Plants
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Drought is the most challenging abiotic stress for rice production in the world. Thus, developing new rice genotype tolerance to water scarcity is one of the best strategies to achieve and maximize high yield potential with water savings. The study aims to characterize 16 rice genotypes for grain and agronomic parameters under normal and drought stress conditions, and genetic differentiation, by determining specific DNA markers related to drought tolerance using Simple Sequence Repeats (SSR) markers and grouping cultivars, establishing their genetic relationship for different traits. The experiment was conducted under irrigated (normal) and water stress conditions. Mean squares due to genotype × environment interactions were highly significant for major traits. For the number of panicles/plants, the genotypes Giza179, IET1444, Hybrid1, and Hybrid2 showed the maximum mean values. The required sterility percentage values were produced by genotypes IET1444, Giza178, Hybrid2, and Giza179, while, Sakha101, Giza179, Hybrid1, and Hybrid2 achieved the highest values of grain yield/plant. The genotypes Giza178, Giza179, Hybrid1, and Hybrid2, produced maximum values for water use efficiency. The effective number of alleles per locus ranged from 1.20 alleles to 3.0 alleles with an average of 1.28 alleles, and the He values for all SSR markers used varied from 0.94 to 1.00 with an average of 0.98. The polymorphic information content (PIC) values for the SSR were varied from 0.83 to 0.99, with an average of 0.95 along with a highly significant correlation between PIC values and the number of amplified alleles detected per locus. The highest similarity coefficient between Giza181 and Giza182 (Indica type) was observed and are susceptible to drought stress. High similarity percentage between the genotypes (japonica type; Sakha104 with Sakha102 and Sakha106 (0.45), Sakha101 with Sakha102 and Sakha106 (0.40), Sakha105 with Hybrid1 (0.40), Hybrid1 with Giza178 (0.40) and GZ1368-S-5-4 with Giza181 (0.40)) was also observed, which are also susceptible to drought stress. All genotypes are grouped into two major clusters in the dendrogram at 66% similarity based on Jaccard’s similarity index. The first cluster (A) was divided into two minor groups A1 and A2, in which A1 had two groups A1-1 and A1-2, containing drought-tolerant genotypes like IET1444, GZ1386-S-5-4 and Hybrid1. On the other hand, the A1-2 cluster divided into A1-2-1 containing Hybrid2 genotype and A1-2-2 containing Giza179 and Giza178 at coefficient 0.91, showing moderate tolerance to drought stress. The genotypes GZ1368-S-5-4, IET1444, Giza 178, and Giza179, could be included as appropriate materials for developing a drought-tolerant variety breeding program. Genetic diversity to grow new rice cultivars that combine drought tolerance with high grain yields is essential to maintaining food security.

ACS Style

Mahmoud M. Gaballah; Azza M. Metwally; Milan Skalicky; Mohamed M. Hassan; Marian Brestic; Ayman El Sabagh; Aysam M. Fayed. Genetic Diversity of Selected Rice Genotypes under Water Stress Conditions. Plants 2020, 10, 27 .

AMA Style

Mahmoud M. Gaballah, Azza M. Metwally, Milan Skalicky, Mohamed M. Hassan, Marian Brestic, Ayman El Sabagh, Aysam M. Fayed. Genetic Diversity of Selected Rice Genotypes under Water Stress Conditions. Plants. 2020; 10 (1):27.

Chicago/Turabian Style

Mahmoud M. Gaballah; Azza M. Metwally; Milan Skalicky; Mohamed M. Hassan; Marian Brestic; Ayman El Sabagh; Aysam M. Fayed. 2020. "Genetic Diversity of Selected Rice Genotypes under Water Stress Conditions." Plants 10, no. 1: 27.

Original article
Published: 30 June 2019 in Alexandria Science Exchange Journal
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Thirteen rice genotypes were grown in the two successive rice seasons 2017 and 2018 to assess the presence of variability for desired traits and estimate genetic parameters and correlations for traits under normal and heat stress conditions. Analysis of variance revealed significant differences due to environments, genotypes and their interaction for all studied characteristics in both seasons. The estimates of genotypic (GCV) and phenotypic (PCV) coefficient of variation were highly significant for all studied traits and generally, the PCV values were higher than GCV values, in both seasons. Leaf rolling and sterility percentage increased under heat stress, while days to heading, plant height, number of tillers and number of panicles / plant, 100-grainweight and grain yield/plant decreased under heat stress in comparison to normal condition. As mean performance Giza 179, Giza 178 and Sakha 101 surpassed other genotypes in grain yield and its important attributes, while WAB56-50/Sakha101-1, WAB56-50/Sakha101-2 and IR65907-206-7-8/Gyehwa71 gave the lowest grain yield in both seasons. Giza178 and WAB56-50/Sakha101-1 recorded the lowest values of geometric mean productivity, stress susceptibility index and yield index which refer to those genotypes highly tolerance to heat stress, while Giza 177 and Sakha 101 gave the highest values to be the most heat susceptible genotypes under study. Highly positive and significant phenotypic correlations were observed between yield index and leaf rolling, sterility percentage, geometric mean productivity and stress susceptibility index, otherwise number of tillers/plant, number of panicles/panicle and panicle weight, as yield attributes had highly significant negative correlation with the yield index. From the results we can conclude that, the genotypes can be scored as heat tolerant, based on days to heading, leaf rolling, tillering productivity and spikelets sterility percentage.

ACS Style

Mahmoud M. Gaballah; Aziz F. Abu El-Ezz. Genetic Behavior of Some Rice Genotypes under Normal and High Temperature Stress. Alexandria Science Exchange Journal 2019, 40, 370 -384.

AMA Style

Mahmoud M. Gaballah, Aziz F. Abu El-Ezz. Genetic Behavior of Some Rice Genotypes under Normal and High Temperature Stress. Alexandria Science Exchange Journal. 2019; 40 (2):370-384.

Chicago/Turabian Style

Mahmoud M. Gaballah; Aziz F. Abu El-Ezz. 2019. "Genetic Behavior of Some Rice Genotypes under Normal and High Temperature Stress." Alexandria Science Exchange Journal 40, no. 2: 370-384.