Induced variability and association of traits in the mutant lines of red rice variety MO4
Sandhya Rani S N, Shridevi A Jakkeral, Dushyanthakumar B M, Girijesh G K, Basavaraj I Halingali
The present investigation was carried out with 120 mutant lines of red rice variety MO4 induced by gamma rays (15, 25, 35 and 45kR) along with the two untreated checks MO4 and Jyothi. These were evaluated for induced variability and character association using Randomized complete block design during Kharif 2019 at Zonal Agricultural and Horticultural Research Station, Bhramavar. Analysis of variance exhibited highly significant differences among the mutant lines for all the characters studied. High magnitude of GCV and PCV accompanied with high heritability and genetic advance as per cent mean was observed in number of grains per panicle and number of filled grains per panicle, indicating that these traits could be used as selection indices for yield improvement. Trait association of yield contributing traits revealed significantly positive association with test weight, straw yield per plant and harvest index. Path coefficient analysis revealed harvest index, straw yield per plant, plant height, number of grains per panicle, spikelet fertility, number of tillers per plant, test weight kernel length and kernel breadth had direct positive effect on yield. Among these traits harvest index expressed both positive and high direct effects. Thus, this trait perhaps used as selection criteria in further crop improvement strategy.