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。迫切需要对耐冷新品种进行有效筛选，如以创客为基础。本研究旨在鉴定高耐寒品种“东北PL-3”（PL3）的耐寒QTL，并阐明该QTL的生理功能。以PL3与“明光”（Akihikari）（弱耐受性）间的215个重组自交系（F_8）为分析材料。在5号和12号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具有在低温下保持花药长度的作用，5号染色体上的QTL具有保持较高的特定花药长度受精效率的作用。

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.