在人工气候室采用盆栽模拟水稻生殖生长阶段的高温胁迫热害，研究不同时期及不同持续时间的高温胁迫对水稻产量及产量特征的影响。结果表明，超级杂交水稻Y两优1号与常规优质稻桂育9号，以抽穗扬花期计为0 d，分别在-9 d、-6 d、-3 d、0 d、3 d、6 d、9 d、12 d不同生育时间遭遇高温胁迫时的颖花结实率变化趋势相当，抽穗扬花期当天遭遇高温胁迫处理的颖花结实率最低，且随胁迫处理时间的延长，损害加重；在持续处理5 d的条件下，-3 d期的高温处理对颖花结实率的降低也很严重，甚至低于抽穗扬花当天高温胁迫处理3 d时的结实率。不同时期的高温胁迫处理的损害在品种间存在显著差异，选择耐热性较强的品种有利于应对局部生态点易发生的热害天气。
A pot experiment was conducted in phytotron to simulate the high temperature stress at reproductive growth phase, yield and yield characters were investigated under the high temperature stress with different occurring periods and duration. The results showed, the heading and flowering day was identified as 0 d, high temperature stress has been imposed at the period -9 d、-6 d、-3 d、0 d、3 d、6 d、9 d、12 d across reproductive growth phase and the lasted two duration were 3 days and 5 days, respectively, the spkilets setting rate performed same variation tendency between the super hybrid rice variety Y Liangyou 1 and inbred perfect quality rice variety Guiyu 9. The lowest spkilets setting rate appeared at the heading and flowering day, namely 0 d, high temperature damage became more serious as the duration increased. Under the duration 5 days, high temperature stress occurred at the period -3 d reduced the spkilets setting rate seriously and even more than that of at the heading and flowering day with the duration 3 days. The different tolerance to high temperature stress among varieties existed, high temperature tolerance rice varieties should be employed to encounter the heat damage weather at locality ecological sit where high temperature stress is incident.
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