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宁7840系江苏省农科院1975年开始进行抗赤霉病小麦育种首批选配的抗病组合之一.杂交组合是:(阿芙乐尔×安徽11号)F_2×苏麦3号.阿芙乐尔是从苏联引进的抗锈、抗白粉病小麦品种,穗较大,但冬性强,对光照反应敏感,晚熟.根据性状互补的原则,与安徽11号杂交后,在其F_2代中选择优良单株,再与抗赤亲本苏麦3号进行杂交,经昆明夏繁加代,多次鉴定选择,在1979年获得了F_7代稳定的抗赤霉病兼抗秆、叶、条锈和白粉病的多抗品系.
Ning 7840 Department of Jiangsu Academy of Agricultural Sciences started in 1975 one of the first batch of anti-scab resistance wheat breeding one of the optional combination of combinations is: (Aful × Anhui 11) F_2 × Sumai 3. A Fuleer is a rust resistant wheat powdery mildew resistant wheat introduced from the Soviet Union with a large spike but strong winter, sensitive to light and late maturity.According to the principle of complementarity, after crossing with Anhui 11, Selection of excellent single generation plants, and then against the pro-Pak pro-Sumai No. 3 hybrids, the Kunming Xia Fan add generation, multiple identification selection, in 1979 was F7 generations of anti-scab resistance and anti-stalk, leaf, Multiple strains of rust and powdery mildew.