论文部分内容阅读
1991年黑龙江省和吉林省东部近海地区,由于7月份异常低温,普遍遭受水稻孕穗期障碍型冷害。重者减产40%,轻者20～30%。1988年吉林省的延边自治州曾发生历史上罕见的特大障碍型冷害,空壳率高达50～70%,全州水稻减产20万吨,比常年减产45%。一、特点水稻障碍型冷害,是指从水稻幼穗形成期开始,至出穗开花期这一段时间,遭受短时间的异常低温所形成的花粉发行不良或受精不良,造成颖花不育, 产生大量空壳而严重减产。而其中又处在孕穗期(减数分裂期遇低温)者受害最重。也就是说水稻在出穗前十
In 1991, the coastal areas in the eastern part of Heilongjiang Province and Jilin Province suffered from chilling injury at the booting stage of rice due to the unusually low temperature in July. Heavy reduction of 40%, light 20 to 30%. In 1988, Yanbian Autonomous Prefecture in Jilin Province suffered a history of rare cholera-type chilling injury. Its shell-forming rate was as high as 50% to 70%. The state’s rice production was reduced by 200,000 tons, 45% less than that of the previous year. First, the characteristics of rice chilling injury, refers to the panicle from the beginning of rice panicle, to panicle flowering period of this period, suffered a short period of abnormal low temperature formed pollen poor or poor fertilization, resulting in sterility, resulting A large number of empty shell and a serious cut. Which in the booting phase (meiosis encountered low temperature) who suffer the most. That is to say the rice is in the top ten before heading out