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以小麦Ｒｈｔ３的两个株高等基因系及其ＢＣ２３Ｆ２分离群体为材料，分析了与Ｒｈｔ３矮秆基因连锁的赤霉酸不敏感基因Ｇａｉ３的遗传规律及其与Ｒｈｔ３的遗传关系。结果表明：赤霉酸不敏感性由单个显性基因控制，Ｆ２分离比率为３∶１（不敏感∶敏感），非常符合χ２测验。Ｇａｉ３基因与Ｒｈｔ３基因连锁紧密，交换值为０．０６０±０．０１２和０．０５５±０．０１３。
The genetic relationship of Gai3, a gibberellic acid-insensitive gene linked to Rht3 dwarfing gene, and the genetic relationship with Rht3 were analyzed using the two isogenic lines of wheat Rht3 and their BC23F2 isolates. The results showed that the insensitivity of gibberellic acid was controlled by a single dominant gene. The F2 segregation ratio was 3:1 (insensitive: sensitive), which was in good agreement with χ2 test. The Gai3 gene is closely linked to the Rht3 gene, with exchange values of 0.060 ± 0.012 and 0.055 ± 0.013.