辐照育种杂交水稻Ⅱ优838的耐热性鉴定

采用田间和实验室耐热鉴定相结合的方法对水稻Ⅱ优838的耐热性进行了系统鉴定。结果表明,在自然高温胁迫下,Ⅱ优838的剑叶叶绿素含量、结实率和产量比其他9个参试水稻品种都高;在实验室人工气候箱高温胁迫下,Ⅱ优838的剑叶叶绿素含量与超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)的活性比父本辐恢838受影响小。由此可知,Ⅱ优838对高温具有较好的耐受性,且在耐热性上父本辐恢838的贡献大于母本。

Identification of Heat Resistance in Radiation Breed Hybrid Rice Ⅱ YOU 838

A set of field-based identification and laboratory analysis were performed to identify heat resistance of Ⅱ YOU 838. The results showed that chlorophyll content in flag leaf, seed setting rate and yield were the highest in Ⅱ YOU 838 compared with all other nice rice varieties tested under natural high temperature stress. The laboratory analysis showed that the chlorophyll content, SOD, POD, and CAT antioxidant enzyme activities were less affected by heat stress in Ⅱ YOU 838 compared with its paternal under high temperature stress in artificial climate chamber. Accordingly, Ⅱ YOU 838 had superior heat resistance, and its male parent contributed to this characteristic at a higher degree than its female parent.