QTL for cold tolerance at booting stage of rice and its physiological function

冷害一直是日本北部水稻生产的主要问题之一。因此，迫切需要对分子标记基础等耐寒新品种进行有效筛选。本研究以高耐冷性品种东北PL-3(PL3)与秋光(弱耐性)之间的215个重组自交系(F8)为材料，对其耐冷性QTL进行了定位和生理功能研究。在第5、12染色体上发现了孕穗期低温诱导小穗不育的显著QTL。12号染色体上的QTL具有低温下维持花药长度的作用，5号染色体上的QTL具有维持特定受精花药长度的较高效率的作用。

Cold damage has been one of the major problems for rice production in northern Japan. Effective screening for new cold tolerance cultivar such as maker-basis is strongly required. The present study aimed to identify the QTL of cold tolerance of highly cold tolerant cultivar Tohoku PL-3" (PL3) and clarify the physiological functions of QTL. The recombinant inbred lines of 215 lines (F_8) between PL3 and Akihikari" (weak tolerance) were used for analysis. We found significant QTL on chromosome 5 and 12 for spikelet sterility induced by low temperature at the booting stages. The QTL at the chromosome 12 has a role for maintaining anther length at low temperature and the QTL at the chromosome 5 has a role for maintaining higher efficiency for fertilization specific anther length.