1981年我们在试验地里发现鄂麦6号小麦小穗退化和不孕的数目高达40.61%,远较其它小麦品种严重。分析该年的气象资料后,认为这一现象可能与小麦孕穗期遇较长的连阴天气而缺乏光照有关。为了验证这一看法,以及探讨不同的小麦品种孕穗期对弱光的反应,我们于1985—1986年设计了六个小麦品种(系)参加的孕穗期遮光试验。 In 1981, we found in experimental plots that the number of wheat spikelets of Emai 6 was 40.61%, which was far more serious than other wheat varieties. After analyzing the meteorological data of that year, it is considered that this phenomenon may be related to the longer cloudy weather and lack of light at the booting stage of wheat. In order to validate this view and to explore the response of different wheat varieties to low light at the booting stage, we designed six bumper stages of the wheat variety (line) between 1985 and 1986.