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粳稻品种中，色原基因Ｃ和糯性基因ｗｘ的重组率为２３％左右，这已为人们长期以来所熟知。然而，在粳稻与爪哇稻ＫｅｔａｎＮａｎｇａ（ＫＮ）的杂交中，重组率却为１５．１～１８．９％．ＫＮ具有配子败育中性基因即广亲和基因Ｓ－５ｎ，该基因位于Ｃ和ｗｘ两位点之间．在ＫＮ和籼稻品种ＩＲ３６的杂交中，基因Ｃ和ｗｘ的重组率约为３０％．将ＫＮ中Ｃ—Ｓ－５ｎ染色体片断导入粳稻品种，通过两次回交育成了热研１号，通过三次回交育成了热研２号．用这两个粳稻品系代替ＫＮ对重组率变异进行测定．在粳稻品种Ｍｉｙｕｋｉｍｏｃｈｉ（ＭＭ）与热研１号的杂交中，Ｃ和ｗｘ的重组率为１６．ｌ±４．８％，而在热研２号与籼稻品种ＩＲ３６的杂交中重组率却为３０．３＋６．４％．因此，用导入了ＫＮ中Ｃ—Ｓ－５ｎ片断的粳稻品系所进行的试验，也看到了同样的重组率差异．在评价重组率时，还证实了基因８—５ｎ和Ｃ的作用．重组率受Ｃ－８－５ｎ染色体片断中遗传因于的影响，这一事实将有利于研究重组机制和建立水稻分子图谱．
In japonica rice varieties, the recombination rate of chromosomal gene C and waxy gene wx is about 23%, which has long been known to all people. However, the recombination rate was 15.1-18.9% in the crosses between japonica and Java rice Ketananga (KN). KN has a gamete abortion-neutral gene that is the wide-compatibility gene S-5n, which is located between the C and Wx sites. In the crosses between KN and indica variety IR36, the recombination rates of genes C and wx were about 30%. The fragment of C-S-5n in KN was introduced into japonica rice and transformed into Zeyan 1 by two backcrosses. The two japonica lines instead of KN were used to determine the recombination rate variation. In the crosses of japonica rice Miyukimochi (MM) and ZeYan 1, the recombination rate of C and wx was 16. l ± 4.8%, while the recombination rate was 30.3 + 6.4% in the cross between Indica 2 and indica variety IR36. Therefore, the same recombination rate difference was also observed in the test carried out in the japonica rice line in which the C-S-5n fragment of KN was introduced. In evaluating recombination rates, the role of genes 8-5n and C was also confirmed. The fact that the recombination rate is affected by inheritance in the C-8-5n chromosomal segment contributes to the study of the recombination mechanism and the establishment of rice molecular map.