Heterosis and inbreeding depression for seed yield and its contributing characters in safflower (Carthamus tinctorius L.)
Abstract
Abstract
The present study was conducted in order to develop genetic information on heterosis and inbreeding depression for seed yield and its contributing characters using generation mean analysis in safflower (Carthamus tinctorius L.). GMU-2720 x GMU-3423 (Cross-1) depicted a positive and significant relative heterosis, standard heterosis and heterobeltiosis for seed yield per plant. Cross-1 also revealed a significant desirable relative heterosis, standard heterosis and heterobeltiosis for number of others yield contributing traits. Negatively significant inbreeding depression was observed for the characters i.e., the number of branches per plant, the number of capitulum per plant, the number of seeds per capitulum, test weight and seed yield per plant in JMU-1339 x GMU-3423 (Cross -2). It was suggested that the parental genotypes GMU-2720 and GMU-3423 due to their presence in high heterotic combinations viz., GMU-2720 x GMU-3423 would be further exploited in future safflower breeding programme. The cross JMU-1339 x GMU-3423 exhibited a significant negative inbreeding depression for test weight, seed yield per plant and oil content. Hence, this cross would likely to yield beneficial transgressive segregants for these traits leading to the possibility of selecting superior recombinations for high seed yield and high oil content in F2 and succeeding generations.
Key words
Safflower, heterosis, heterobeltiosis, standard heterosis and inbreeding depression
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