野生稻转育后代对褐飞虱抗性的研究

对１０７份栽培稻／野生稻高世代品系及８６个药用野生稻栽培稻回交Ｆ１再生苗进行了苗期抗褐飞虱鉴定，对６４个品系进行了孕穗期抗性鉴定，并初步了野生稻转育后代的苗期拒虫性及孕穗期抗生性等。结果表明，野生稻抗虫基因已导入某些杂交品系Ｂ５，Ｂ２，Ｂ３，Ｂ６，Ｂ１０，Ｂ１１，Ｂ１２，Ｂ１３，Ｂ１４，Ｂ１５，Ｂ７，Ｂ８在苗期表现高抗，在孕穗期表现中抗，抗性水平比对照抗性品种ＩＲ３６高；Ｂ２Ｆ３－５２，Ｂ２Ｆ３－

ON THE BROWN PLANTHOPPER RESISTANCE IN INTROGRESSIVE LINES FROM WILD RICE

Seedling identifications were conducted for determining the resistance to brown planthopper Nilaparvata lugens Stal of 107 advanced lines of cultivated rice/wild rice and 86 regenerated seedlings of F, backcross between medical wild rice and cultivated rice, the resistance in boot stage of 64 lines was also identified, and the repellency in seedling stage and antibiosis in boot stage of introgressive progenies from wild rice were preliminarily inspected. The results indicated that the resistant genes of wild rice to N. lugens were already been introgressed into a number of cross lines: B5, B2, B3, B6, B10, B11, B12, B13, B14, B15, B7 and B8 showed HR in seedling stage and MR in boot stage, higher than that of the resistant check variety IR36; B2F3-52 and B2F3-53 showed MR both in seedling and boot stages; Nl-1, N2-1, N6-1.N14-1 and N16-1 showed R-MR in seedling stage, but S-HS in boot stage. The regenerated seedlings of Y9740-5, Y9741-2 and Y9747-13 and Y9741-1 showde HR, and those of last three lines showed persistent resistance evidently; Y9738-8, Y9747-4 and Y9747-10 showed R; other 15 lines showed MR; and Y9738-8 showed R. All the resistance mechanism of these resistant lines were repellency/antibiosis.