Vol. 12, Issue 12 (2023)

Author(s):
RJ Chhodavadiya, PB Patel, SP Bharda, CM Godhani, MJ Parmar and YKV Naveen

Abstract:
Using the equal weight approach and broad sense heritability, twenty seven selection indices were created, accounting for all possible combinations of the grain yield per plant with five yield contributing characteristics. When selection was based on two or more characters then the expected genetic advance and relative efficiency assessed for different indices increased considerably. Among all the selection indices, the index based on five component characters viz., grain yield per plant, effective tillers per plant, panicle length, grains per panicle and 1000 seed weight (X₁.X₃.X₄.X₅.X₆) possessed the highest genetic gain and relative efficiency as compared to straight selection for grain yield per plant alone. Further, there was a consistent increase in the relative efficiency of the succeeding index with simultaneous inclusion of each character. However, six components based index showed lower efficiency than five components based index in both methods due to negative correlation of plant height with grain yield per plant. It was observed that grains per panicle and panicle length were included in all character combinations exhibiting the best relative efficiency and advancement. Effective tillers per plant was the other important character.