Sequential path analysis for determination of relationships between yield-related characters and yield and amylase content in rice
2018
Sharifi, P.
The present study was conducted to determine the cause and effect of grain yield and yield components in 65 rice genotypes. The rice genotypes included four local landraces (Hashemi, Tarom, Alikazemi and San gjo), four released cultivars with high yield (Khazar, Fajr, HP and Sephidrod) and their 57 derived mutant lines (M5). The genotypes were grown during the spring of 2013-2014 growing season at the experimental farm of Rice Research Institute of Iran (RRII) in Rasht. Grain yield (GY) was positively correlated with plant height (PH), number of panicle per plant (NPP), panicle length (PL), number of spikelet per panicle (SNP), number of filled grains per panicle (FG), 100-grain weight (HGW), amylose content (AC) and gelatinization temperature (GT). The positive and significant correlation coefficients were obtained between amylose content and GY, PW, SNP and GL. Sequential path analysis showed that NPP and PW as the first-order variables accounted 23% of GY variation. The path analysis indicated that there is no common causal factor that directly influences both grain yield and amylose content. The direct effect of spikelets number per panicle was positive on amylose content. Predictor variables containing NPP and PW (as the first-order variables), FG, SNP and PH (as the second-order variables) and GL (as the third-order variables) had positive effects on grain yield and enhanced this predictor variable. Consequently, improvement of these traits can increase potential grain yield. The negative effect of plant height (as the third-order variables) was observed on grain yield. The use of dwarf and semi-dwarf varieties can increase total grain yield.
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