WAASB index revealed stable resistance sources for soybean anthracnose in India

Abstract

Anthracnose caused by Colletotrichum truncatum is a major soybean disease in India. Genetic resistance is the viable option to combat yield losses due to this disease. In the current study, 19 soybean genotypes were evaluated for anthracnose disease resistance at five locations (Medziphema, Palampur, Dharwad, Jabalpur and Indore) for three consecutive years (2017–2019) to identify stable and superior genotypes as resistant sources and to elucidate genotype (G) × environment (E) interactions. Genotype effect, environment effect and G × E interactions were found significant (P < 0.001) where G × E interactions contributed highest (42.44) to the total variation followed by environment (29.71) and genotype (18.84). Through Weighted Average of Absolute Scores (WAASB) stability analysis, PS 1611 (WAASB score = 0.33) was found to be most stable and through WAASBY superiority analysis NRC 128 (WAASBY score = 94.31) and PS 1611 (WAASBY score = 89.43) were found to be superior for mean performance and stability. These two genotypes could be candidate parents for breeding for durable and stable anthracnose resistance. Through principal component analysis, disease score was found to be positively associated with relative humidity, wind speed at 2 m above ground level, effect of temperature on radiation use efficiency and global solar radiation based on latitude and Julian day. Among the five locations, Indore was found to be highly discriminative with the highest mean disease incidence and could differentiate anthracnose-resistant and susceptible genotypes effectively, therefore can be considered an ideal location for breeding for field resistance against anthracnose disease.

Importance of mega-environments in evaluation and identification of climate resilient maize hybrids (Zea mays L.)

“…Hybrids G14, G2, and G7 for 2016, G7, G11 and G3 for 2017, G5, G6 and G10 for 2018, and G2, G10 and G1 for 2019 were identified as the best-performing hybrids. In a similar study WAASBY index was used to identify, stable maize hybrids 34], cotton genotypes for salt effected soils [ 35 ], maize in Huanghuaihai region of China [ 36 ] and soyabean genotypes resistant to anthracnose [ 37 ].…”

Molecular Breeding to Overcome Biotic Stresses in Soybean: Update

“…Identification of the sources of genetic resistance against this disease may be a possible solution to combat yield loss [ 145 ]. Attempts at screening of soybean germplasm for the identification of anthracnose resistance have been carried outby various research groups [ 146 , 147 ].…”

Distribution of Charcoal Rot of Soybean, its Influencing Factors and Pathogenic Variabilities in Different Regions of Madhya Pradesh

“…In India, soybean is a Kharif season crop cultivated in rainfed conditions during which the crop succumbed to various abiotic and biotic stresses (Dupare et al, 2014;Amrate et al 2023a). In this concern, sustainable soybean production in the central part of the country has suffered due to the attack of many diseases such as yellow mosaic, charcoal rot, aerial blight, anthracnose, bacterial pustule, frog eye leaf spot etc (Amrate et al, 2020a;Rajput et al, 2021;Uikey et al 2022;Amrate et al, 2023b).…”