PJB-2018-981
PATH ANALYSIS FOR AGRONOMIC TRAITS AND YIELD OF SOME SALT-TOLERANT RICE CULTIVARS UNDER MODERATE SALINITY CONDITION IN CENTRAL VIETNAM
Lam Ho Nguyen
Abstract
This study was conducted with the aims to determine: (i) the correlation between agronomic traits and yield and (ii) the direct and indirect effects of agronomic traits on rice yield. Those results will improve the selection and breeding of salt-tolerant rice cultivars in the central region of Vietnam. The open-field experiment was arranged directly on soils of moderate salinity (6.35 dS m−1) during the 2017 winter–spring cropping season in Thua Thien Hue province (central Vietnam), Ten popular salt-tolerant rice cultivars were studied. Results showed that among the studied agronomic traits, individual yields had a positive correlation with plant height (r = 0.3624*), total panicles per plant (r = 0.7019***), panicle weight (r = 0.4530**), and total dry biomass (r = 0.7837***). Total panicles per plant, panicle weight, and the number of grains per panicle directly affect rice yield with coefficients of dC = 0.5524, 0.8294, and 0.4355, respectively. Plant height and total dry biomass per plant had low yield coefficients (dC = 0.1330 and 0.2516); however, these factors indirectly affected yield via panicle weight with iC = 0.3772 and 0.3365, respectively. Therefore, the total number of panicles per plant (productive tillers), panicle weight, and total number of grains per panicle should be used as good indicator traits for selecting salt-tolerant rice cultivars for the moderate soil salinity level of central Vietnam.
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