Path analysis of rice grain yield under saline conditions
1988
Bui Chi Buu | Do Xuan Truong (Cuu Long Delta Rice Research Inst., Omon, Haugiang (Viet Nam))
Rice production in saline soils could be increased considerably if salt-tolerant varieties were developed. Seedlings of 19 promising lines from seven crosses involving salt-tolerant parents were transplanted at 25 d after seeding (DAS) in a lowland field in Binh Dai District, Mekong Delta [Vietnam] during 1987 wet season. Spacing was 15 x 20 cm in a randomized complete block design with three replications. Fertilizer was applied at 80-0-0 kg NPK/ha. Soil was silty clay with ECe = 11.8 dS/m before transplanting and 2.8 dS/m at flowering. Path coefficient analysis was used to partition the genotypic correlation coefficient into direct and indirect effects. Under saline conditions, filled grains per panicle had the largest direct effect on yield (1.092). However, its effect through sterility percentage was negative (-0.375), even though the total correlation with yield was significant. Sterility percentage showed a high direct effect on grain yield (0.928). Direct negative effect were observed for number of panicles per square meter, panicle length, and 1,000-grain weight. Other characters, such as panicles per square meter did not show any direct effect on yield. Filled grains per panicle and sterility percentage appear to be most reliable indices for selection under saline conditions
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