Thermal Resistance of Common Rice Maintainer and Restorer Lines to High Temperature During Flowering and Early Grain Filling Stages |
| |
Authors: | FU Guan-fu # SONG Jian # XIONG Jie LIAO Xi-yuan ZHANG Xiu-fu WANG Xi LE Ming-kai TAO Long-xingNational |
| |
Institution: | FU Guan-fu #,SONG Jian #,XIONG Jie,LIAO Xi-yuan,ZHANG Xiu-fu,WANG Xi,LE Ming-kai,TAO Long-xing(National Key Laboratory of Rice Biology,China National Rice Research Institute,Hangzhou 310006,China;) |
| |
Abstract: | Fifteen common rice maintainer lines and 26 high-yielding restorer lines were used to evaluate their thermal resistance and fertility during flowering and early grain filling stages. The rice plants were subjected to high temperature stress (39–43 °C) for 1–15 d from main stem flowering. Based on the heat stress index, they were divided into thermal resistant lines, semi-thermal resistant lines, semi-thermal sensitive lines and thermal sensitive lines. Therefore, the maintainer lines K22B, Bobai B and V20B belonged to thermal resistant lines, whereas II-32B, Zhongzhe B and Zhong 9B belonged to thermal sensitive lines. For rice restorer lines, Minghui 63 had the highest thermal resistance, followed by R207, P32, P929, and the lowest thermal resistant lines P62-2-2, R8006 and P51. The correlation analysis indicated that the heat stress index was significantly correlated with seed-setting rate and abortive grain rate under heat stress, but not under natural conditions. This indicated that heat stress occurred during flowering and early grain filling stages mainly decreased the seed- setting rate and significantly increased the abortive grain rate in both rice maintainer and restorer lines. |
| |
Keywords: | |
本文献已被 CNKI ScienceDirect 等数据库收录! |
|