抽穗扬花期高温对水稻重组自交系群体RIL47结实率的影响

Effect of high temperature at heading and flowering stage on seed-setting rate of rice recombinant inbreed line population (RIL47)

摘要: 以水稻重组自交系群体RIL47 的254 个株系为材料, 在抽穗扬花期于逆境气候鉴定室进行高温处理,并设自然常温对照, 研究了高温对RIL47 群体结实率的影响。结果表明, 自然条件下该群体结实率正常且呈正态分布; 而高温处理下RIL47 群体结实率极显著下降, 平均降幅达81.6%, 结实率下降绝对值符合正态分布。同时, 以热害指数为筛选指标, 从RIL47 中筛选出5 个耐高温株系(07H1619、1590、1521、1706、1608)和3个高温敏感株系(07H1751、1710、1719), 可用于水稻抗高温相关研究。

Abstract: Rice recombinant inbreed line population RIL47 (comprising 254 lines) was treated with high and natural (CK) temperatures at heading and flowering stage and the effect of high temperature on seed-setting rates evaluated. The results indicated that seed-setting rate of RIL47 followed a normal distribution curve under natural conditions. Compared with natural temperature, high temperature significantly decreased RIL47 seed-setting rate with an average decline of 81.6%. Absolute decline in RIL47 seed-setting rate followed a normal distribution curve. Five heat-tolerant lines (07H1619, 1590, 1521, 1706 and 1608) and three heat-sensitive lines (07H1751, 1710 and 1719) were simultaneously selected from the 254 RIL47 lines by using a heat-injure index. This could be used in analyzing heat resistance of rice.