Vol. 10, Special Issue 12 (2021)

Author(s):
Suhasini B, Dushyanthakumar BM and Harish Babu BN

Abstract:
The study on the association between eight physiological parameters with yield was conducted during summer 2019-20 at College of Agriculture, University of Agricultural and Horticultural Sciences, Shivamogga in the field experiment plots of the department of Genetics and Plant Breeding under moisture stress condition. The experimental material consisted of 40 rice genotypes, including four checks Anagha, Jyothi, JGL-1798 and BPT 5204. It was observed that genotypic correlation coefficients were higher than the corresponding phenotypic correlation coefficients indicating that the environmental influence reduces the relationship between yield and physiological parameters contributing towards yield under moisture stress condition in rice. Correlation coefficient analysis revealed a significant positive association of grain yield per plant with chlorophyll content, root length, root to shoot ratio, root volume, relative water content and proline content. A significant negative correlation was observed between leaf rolling and yield per plant. Path coefficient analysis revealed the highest positive direct effect of relative water content on yield per plant, while leaf rolling had the highest negative direct effect on yield. Correlation and path analysis indicated traits viz., root length, root to shoot ratio, root volume, relative water content and proline content could be used as selection index for yield as they exhibited significant positive correlation and direct positive effect with yield per plant.