Combining ability for yield and yield attributing characters inrabi mungbean [Vigna radiata (L.) Wilczek.]

Abstract

Seven genotypically diverse lines of mungbean were crossed in diallele fashion to identify genotypes with high general combining ability and specific cross combinations with high specific combining ability for yield and yield attributes in rabi season excluding reciprocals. The analysis for combining ability revealed significant mean sum of squares due to general and specific combining ability for all the characters studied indicating importance of both additive as well as non-additive gene effects involved in the expression of all the characters. Higher magnitude of general combining ability variances for most of the traits except for number of branches per plant, pod length, number of seeds per pod and harvest index pointed out the preponderance of additive component of the genetic variance in the expression of the characters under study. The good general combiners for yield attributing traits were Co-4, GBM-1 and Meha and the best specific cross combinations having the highest SCA effect for yield and yield attributing traits were Co-4 x Meha, Co-4 x GBM-1, Rm-9-126 x Rm-9-134, GBM-1 x Meha and Rm-9-133 x GBM-1. This cross combinations could be utilized for further breeding programmes for the development of rabi mungbean varieties with chilling tolerant ability or photo-thermo insensitivity, so as to exploit potential of rabi mungbean in rice fallows of heavy rainfall zone.

Combining Ability Studies for Earliness and Determinate Trait in Genetically Diverse Lines of Ricebean [Vigna umbellata (Thunb.) Ohwi and Ohashi]

“…RBHP-900 showed significant positive GCA effect for two traits, viz., pods per cluster and pod length. The similar type of results also reported by Patel et al, (2010), Yadav and Lavanya (2011), Sujata and Kajjidoni (2013), Bainade et al, (2014) and Vaidya et al, (2015) In present investigation, the good general combiners with respect to different traits indicated that no single parent was proved to be a good general combiner for all the traits. Line 'RBHP-43' was found to be a good general combiner for days to flowering, days to maturity, branches per plant and pods per plant.…”

“…Thus, the ultimate aim of a breeder is to generate desirable transgressive segregants to develop potential homozygous lines through hybridization. The cross combinations with significant desirable SCA effects along with GCA effects of the parents for various traits are listed in Table 3 Patil et al, (2011), Sujata andKajjidoni (2013), Patil et al, (2014) and Vaidya et al, (2015).…”