Genetic Analysis of Main Characteristics Related to Cold Tolerance in japonica Rice from Low-Latitude Plateau and High-Latitude Plain
XU Furong, TANG Cuifeng, YU Tengqiong, A Xinxiang, ZHANG Enlai, YANG Yayun, ZHANG Dunyu, DONG Chao, PENG Xinxi, DAI Luyuan*
Yunnan Key Laboratory of Agricultural Biotechnology/Biotechnology and Germplasm Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming 650205, China; *Corresponding author, E-mail: <A href=
Six varieties including three varieties from lowlatitude plateau in Yunnan Province, China, and the other three from highlatitude plain in Japan and Korea and their 30 F1 crosses obtained by complete diallel crossing were planted under five different environments. The genetic model of additivedominancematernal effects (ADM) was applied to genetic analysis on four traits related to cold tolerance, i.e. spikelet fertility (SF), specific spikelet fertility (SSF), panicle exsertion (PE) and days to heading (DH). The results showed that SF and SSF were mainly affected by interaction effect between genotype and environment, with little maternal effect. Interaction heritability in broad sense between genotype and environment for SF and SSF were 63.5% and 56.5%, respectively, the highest compared with other effect values for heritability. Correlations between phenotype, genotype, additive and dominant effects of SF and those of SSF reached significant level with the correlation coefficients ranged from 0.717 to 1.000. Correlations between phenotype, genotype, additive and dominant effects of SF and those of PE also reached significant level with the correlation coefficients ranged from 0.161 to 0.975. The range of coefficient of variation varied with the traits, and that of PE were the maximum compared with other three traits. Hence PE was also a valuable trait in evaluation of cold tolerance. As for to PE and DH, their broadsense heritabilities were 59.6% and 81.4%, respectively, the biggest compared with other effect values for heritability. DH was mainly controlled by genetic effects, with the least influence by environmental conditions. The lowtemperature stress should be one of the essential conditions to breed varieties with cold tolerance. A cross between Ilpumbyeo and Kunmingxiaobaigu was an optimum combination for breeding new cold tolerant japonica variety at the booting stage.
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