关键词: 一般配合力, 特殊配合力, 不完全双列杂交, 陆稻

Abstract: Analysis of the combining ability and the hereditability was conducted to improve Yunnan traditional upland rice by using the model (Burton 1951, 1959) based on the data obtained in incomplete diallel crossed with seven abroad medium or semidwarf improved upland rice accessions and seven Yunnan traditional upland rice varieties in 1993. The results showed that the combining abilities were different for different materials on one character or different strains on the same material, they were concerned with materials for GCA (general combining ability), SCA (special combining ability). The GCA of abroad upland rice was better than that of Yunnan's, selection of the researched characters was important for abroad or Yunnan upland rices, with particular reference to panicles per plant, spikelets fertility about abroad upland rices, and spikelets per panicle about Yunnan's. The SCA of the two kinds of varieties combining were significant or highly significant on panicles/plant, days to heading and spikelets/panicle. It's effective to improve Yunnan traditional upland rice by crossing the abroad with the traditional and verified by the fact of breeding, which should be used the traditional breeding method and polycross, the selection emphasis should be plant height, days to heading and combinations in earlier generations, and panicles/plant, spikelets/panlcle, grains/panicle, fertility and single plant in advanced generations. Slmultanlously the 14 parents were evaluated and were proposed good GCA's parents of IRAT216, IRAT104, Tos 2300, Mengwangu. At last. it was discussed that the effect of GCA, SCA to different breeding strategy, the possibility of improving Yunnan upland rice by crossing irrigated rice with upland rice.

Key words: general combining ability, incomplete diallel cross, special combining ability, upland rice