Yield and yield attributes are important components in genotypic evaluation. The butterfly pea is a native plant of Indonesia, and it is considered an underutilized crop. The goals of this study were to evaluate genotypes using environment (year) interactions (GEIs) with yield and yield attributes, and evaluate butterfly pea genotypes based on stability measurements and sustainability index (SI). The study was conducted at the Ciparanje Experimental Field, Faculty of Agriculture, Universitas Padjadjaran using 35 butterfly pea genotypes in a randomized complete block design with two replications. The field trial was conducted over three years (2018–2020). The results showed that the yield and yield attributes were influenced by GEIs. Additive main effects and multiplicative interaction (AMMI) selected 11 stable genotypes (31.43%); genotype plus genotype by environment interaction (GGE) biplot, AMMI stability value (ASV), and genotype stability index (GSI), each selected six genotypes (17.14%) that were stable and high-yielding, and SI selected 18 genotypes (51.43%) that were stable and high-yielding. There were three genotypes identified by all measurements, namely G2, G14, and G16. These three genotypes can be selected as the superior genotypes of the butterfly pea for flower production, and can be used as material for crosses in plant-breeding prog.

Butterfly pea (Clitoria ternatea L.) is a leguminous plant with several potential health benefits. The scientific name is derived from its origin on Ternate Island, North Maluku. Therefore, this study aimed to analyze the genetic variability in butterfly pea using Intergenic Simple Sequence Repeat (ISSR) markers in North Maluku. Field surveys, collection trips, and habitat studies of butterfly pea plants were conducted on Ternate, Tidore, Halmahera, and Morotai Islands. Genetic diversity was analyzed based on molecular data from the ISSR method. The molecular analysis results obtained using PCR-ISSR on 18 accessions showed a low degree of similarity. Among these, 15 accessions from Ternate, Tidore, Morotai, and Halmahera were in group A, while 3 from Ternate, Tidore, and Halmahera were in group B. All accessions exhibited a genetic similarity level of 0.709, indicating significant diversity. The arrangement among accessions on the dendrogram was similar to the phylogenetic tree, showing separation and spread at 0.608–0.924 based on the Jaccard coefficient. The results suggested that C. ternatea probably originated from Ternate, and subsequently spread to Tidore, Halmahera, and Morotai due to its use as a herbal medicine and ornamental plant. This information could be used as the basis for butterfly pea conservation and cultivation activities in Indonesia, specifically in Ternate Island, North Maluku.

Dewayani, Maulana H, Wicaksana N, Suganda T, Concibido V, Karuniawan A. 2021. Distribution and prevalence of scurf (Monilochaetes infuscans) on sweet potato (Ipomea batatas) in West Java, Indonesia. Biodiversitas 22: 2876-2883. Scurf (Monilochaetes infuscans) is a common sweet potato (Ipomoea batatas (L.) Lam.) tuber skin discoloration disease, that can cause significant yield loss, especially when tubers are destined for the export market. Despite the economic importance of the disease in West Java, Indonesia, there is a dearth of information on the distribution and severity of scurf disease. To address this gap, a disease survey was carried out across 28 fields in six districts (Bandung, Sumedang, Garut, Kuningan, Cianjur, and Bogor) of West Java from 2016 to 2018. Scurf disease prevalence was recorded by counting the number of infected tubers from 15 plant samples per field. Disease incidence was recorded when at least one infected tuber per plant was observed. Severity of scurf diseases was estimated by measuring the percentage of infected surface area, using AutoCAD map 2019. Results show that scurf was distributed across all locations surveyed. Disease incidence ranged from 1.68% (Cikadu) to 27.56% (Cilembu) while disease severity ranged from 7.92% (Cikadu) to 57.00% (Cilembu). Based on potato dextrose agar (PDA) culture plates, 68.57 % of tubers were infected with various fungi. Among them, M. infuscans (32.14 %) was the most prevalent and most widely distributed pathogen associated with the scurf disease across sweet potato fields in West Java, Indonesia. To effectively manage the disease and improve farmers’ income, it is imperative to establish effective and sound integrated disease mitigation strategies based on the results of this survey.

Multilocation experiments are the steps to determine the genotype stability being tested. Honey sweet potato is a superior agricultural product from West Java, Indonesia. High yield and sweetness are the important traits of the new honey sweet potato breeding lines. In this study, the sweetness level used was the soluble solid level (°brix). The goals of this study were to determine the effects of genotype by environment interactions (GEIs) and to select for storage root yield stability and sweetness among the new promising honey sweet potato lines. Field trials have been carried out using randomized completed block design, which was repeated thrice for the 16 genotypes, across six locations in West Java, Indonesia. To estimate GEIs, data were analyzed using combined analysis of variance. Storage root yield stability (t/ha) and sweetness (°brix) were estimated using parametric measurements, nonparametric measurements, and GGE biplot. The results showed that the genotype (G), environment (E), and GEIs have significant influences on storage root yield and sweetness. Two genotypes, SP3 and SP16, have been identified as the most stable ones with high yield and sweetness across several locations. These two superior genotypes are recommended as potential new honey sweet potato varieties for West Java, Indonesia.

Abstrak Bunga telang (Clitoria ternatea L.) merupakan tanaman legum yang bagian bunganya telah banyak dimanfaatkan. Double petal adalah salah satu varian spesies bunga telang yang banyak ditemukan di Asia Tenggara. Penelitian ini bertujuan untuk mengevaluasi keragaman fenotipik plasma nutfah bunga telang double petal asal Indonesia (Bali, Jawa Barat, dan Jawa Timur) dan Thailand berdasarkan morfologi bunga. Percobaan disusun dalam Rancangan Acak Kelompok (RAK) dengan tiga ulangan. Data morfologi dianalisis menggunakan analisis multivariat berupa Analisis Komponen Utama (Principal Component Analysis) dan Analisis Klaster (Cluster Analysis) dengan bantuan program NTSYS 2.1. Hasil penelitian menunjukkan terdapat lima komponen utama yang berpengaruh terhadap keragaman aksesi dengan persentase keragaman kumulatif 88,82%. Karakter tipe bunga, susunan mahkota bunga, keberadaan lunas, tipe benang sari, dan posisi kepala putik memberi pengaruh terbesar terhadap keragaman aksesi. Analisis klaster membagi aksesi-aksesi tersebut menjadi dua klaster dengan koefisien ketidakmiripan 3,01–6,83. Dari hasil penelitian dapat disimpulkan bahwa bunga telang double petal asal Indonesia dan Thailand memiliki keragaman yang luas dan kekerabatan yang jauh; aksesi asal Bali memiliki morfologi bunga dan klaster yang berbeda dengan aksesi asal Jawa Barat, Jawa Timur, dan Thailand. Informasi ini akan bermanfaat dalam merencanakan pengelolaan plasma nutfah dan pemuliaan bunga telang double petal. Abstract Butterfly pea (Clitoria ternatea L.) is a legumeplant of which flower parts are widely used. One of butterfly pea variant is double petal which commonly found in Southern Asia. This study aimed to evaluate phenotypic diversity of double petal butterfly pea germplasm from Indonesia (Bali, West Java, and East Java) and Thailand based on flower morphology. The experiment was arranged in randomized complete blocks design with three replications. Morphology data were subjected to multivariate analysis using Principal Component Analysis and Cluster Analysis and performed by NTSYS 2.1. The result showed that there were five significant principal components that cumulatively explained 88.82% of variance. Existence of keel, aestivation type, position of stigma, type of stamen, and flower type gave high contributions to the diversity of accessions. Cluster analysis grouped the accessions into two clusters with dissimilarity coefficient from 3.01–6.83. From the results, it can be concluded that double petal butterfly pea from Indonesia and Thailand have wide diversity and genetic relationship; the accessions from Bali have different flower morphology and cluster compared to the accessions from East Java, West Java, and Thailand. The information will help planning management of the germplasm and breeding double petal butterfly pea.