Genetic variability and interdependence of morphological traits in castorbean (Ricinus communis L) mutants

Abstract

Morphological data pertaining to different attributes were recorded in M4 and M5 generations of gamma irradiatedcastorbean to study correlations, path analysis and some genetic parameters. Significant and positive correlation of capsuleyield per plant with seed yield was observed. Hundred seed weight showed positive but non significant phenotypic andsignificant genotypic correlation with seed yield. Capsule yield per plant also showed high direct effect combined with highpositive and significant genotypic correlation. Number of capsules of main spike, main spike length and number of spikesper plant showed high heritability coupled with high genetic advance which revealed the preponderance of additive genesand seed yield could be improved via these traits. However, length of spike and 100-seed weight may also be considered forimprovement in seed yield. On contribution of different morphological traits, 16 mutants yielded higher than the check, however,the maximum seed yield per plant (mean of 02 years) was gained by CBM-7 (209.54 g) followed by CBM-17 (183.35 g)as against the check DS-30 (126.75 g). These prospective mutants can be tested for genetic stability and adaptability overdifferent locations for variety release programme in the country.

Keywords

• genetic analysis
• variability
• correlation
• gamma radiation
• mutant
• castorbean