Thermal Resistance of Common Rice Maintainer and Restorer Lines to High Temperature During Flowering and Early Grain Filling Stages
Thermal Resistance of Common Rice Maintainer and Restorer Lines to High Temperature During Flowering and Early Grain Filling Stages
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DOI：
10.1016/s1672-6308(12)60055-9
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发表时间：
2012-12-01
期刊：
影响因子：
4.8
通讯作者：
Tao Long-xing
中科院分区：
文献类型：
--
作者：
Fu Guan-fu;Song Jian;Tao Long-xing
以15个普通水稻保持系和26个高产恢复系为材料，在开花期和灌浆初期对其耐热性和育性进行了研究。水稻植株从主茎开花开始经受高温胁迫（39-43 ℃）1-15 d。根据热胁迫指数将其分为耐热品系、半耐热品系、半热敏品系和热敏品系。因此，保持系K22 B、博白B和V20 B属于耐热系，而II-32 B、中浙B和中9 B属于热敏系。恢复系耐热性以明恢63最高，R207、P32、P929次之，P62-2-2、R8006、P51最低。相关分析表明，在热胁迫条件下，热胁迫指数与结实率和败育率呈极显著正相关，而在自然条件下，热胁迫指数与结实率和败育率不相关。这表明，开花期和灌浆前期的高温胁迫主要降低了保持系和恢复系的结实率，显著提高了败育率。
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 degrees 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.