Performance and Stability of Cyamopsis Tetragonoloba (l.) Taub Genotypes under Rainfed Conditions

Cluster bean (Cyamopsis tetragonoloba (L.) Taub) is a valuable arid legume grown in India, Pakistan and the United States. India accounts for 80% of its total production in the World of which Rajasthan occupies the largest area. Unavailability of promising drought tolerant varieties is responsible for its low productivity against the national average, which is a matter of serious concern. The performance and stability of 40 promising genotypes of cluster bean collected from different geographical areas were evaluated in rainy season consequently for three years under rainfed conditions. The combined analysis of variance showed highly significant genotype, environment, and genotype × environment effects on grain yield and seed gum contents. Stability analysis revealed 7 genotypes for superior seed yield and 8 for higher gum contents were stable across the environments. Eventually, two genotypes RGC 1076 and GAUG 004 with regression coefficient less than 1 and non-significant deviation from regression were fairly stable across the environments and had both mean seed yield and per cent gum contents above the grand mean. The genetic potential of RGC 1076 and GAUG 004 genotypes can be exploited in increasing production and productivity of cluster bean in drought prone areas of the country.