PJB-2017-714
CORRELATION AND PATH ANALYSIS OF MORPHOLOGICAL PARAMETERS CONTRIBUTING TO YIELD IN RICE (ORYZA SATIVA) UNDER DROUGHT STRESS
MUHAMMAD ASIM BHUTTA
Abstract
Twenty (20) diverse rice genotypes were studied to estimate the genetic and phenotypic correlation among particular morphological traits and their direct and indirect contribution towards yield under stress. Significant variation among breeding material for all the traits was detected under normal and drought conditions. The results indicated that plant height (0.17**), panicle length (0.49**), thousand grain weight (0.11*), grains per panicle (0.69**), grain weight per panicle (0.99**), number of tillers per plant (0.14) showed positive and significant association with yield per plant under drought stress at both genotypic and phenotypic level. Significant reduction in plant height was observed under drought stress. Among all 20 accessions, BASMATI-140 exhibited the highest plant height comparatively to SUFAIDA 20 under drought condition. Drought drastically affected the yield per plant as 20-65% yield reduction was observed in different genotypes. Under stress, HARANDI-379, MUNJI-78B-1 and BASMATI-242 were comparatively better yielding compared to other genotypes. Grain weight per panicle has direct positive effect on yield per plant in both drought and normal conditions depicting that it is an important selection parameter. Thus, based on these observations, selection could be performed under normal as well as drought conditions for selection of drought tolerant lines.
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