论文部分内容阅读
选用抗虫水稻品种是防止褐飞虱危害的一个重要措施。但在实践中,当连续大面积种植一个抗虫品种后,虽然不适应生存的褐飞虱生物型受到了抑制或淘汰,而少数幸存的褐飞虱生物型则会通过自交逐渐形成一个占优势的生物型,原来的抗虫水稻品种逐渐丧失其抗虫作用。如IR_(26)、IR_(28)、IR_(29)、IR_(30)、IR_(34)等水稻品种都具有能抗褐飞虱的BPh_1基因,目前在菲律宾地区大多变为感虫的品种。在印尼引进IR32和IR36时,两品种都是抗褐飞虱的,但经过几季种植之后,也变为感虫品种。这些抗虫品种的抗性的之所以丧失的这样快,主要是由于大田出现新的褐飞虱生物型。因此只有把褐飞虱的
The selection of insect-resistant rice varieties is an important measure to prevent the harm of the brown planthopper. However, in practice, although a large number of insect-resistant cultivars were planted on a large area, although the biotypes of Nilaparvata lugens did not adapt to be suppressed or eliminated, the few surviving Nilaparvata lugens biotypes formed a predominant biotype by selfing , The original insect-resistant rice varieties gradually lost their insect-resistant effect. Rice cultivars such as IR 26, IR 28, IR 29, IR 30 and IR 34 all have BPh 1 resistance to BPH, and most of them are now susceptible to susceptible insects in the Philippines. When IR32 and IR36 were introduced in Indonesia, both varieties were resistant to BPH, but after a few seasons of planting, they also became susceptible varieties. The rapid loss of resistance to these insect-resistant species is mainly due to the emergence of a new brown planthopper biotype in the field. So only the brown planthopper