印度南瓜梭形果突变体的发现及遗传分析

从印度南瓜自交系HL中发现了一个梭形果突变体HL-fu。该突变体的花、果、茎等多器官的生物学特性同时发生了明显变异:雌花及雄花花器中异性花蕊的残存度较野生型高;果实为梭形,果形指数达野生型5倍;节间呈现长短交替分布的排列状态,叶序类似于对生。以突变体HL-fu与野生型HL杂交分别构建了正、反交F1,正交F2,BC1(P1)F1、BC1(P2)F1群体进行遗传分析,推测该变异类型为隐性多效单基因突变,突变性状受1对隐性核基因fu控制。探讨了梭形果突变体在南瓜育种及相关基础研究方面的潜在价值。

Discovery and Genetic Analysis of a Fusiform Fruit Mutant in Winter Squash (Cucurbita Maxima Duch.)

A fusiform fruit mutant HL-fu was found from inbred line HL of Cucurbita maxima. There was obvious biological characteristic variation on a lot of organs of the mutant, such as flower, fruit, stem. The residual degree of the stamen from female flower and the pistil from male flower of the mutant were more than the wild type one. Its fruit was fusiform, it was five times on the fruit shape index of the mutant than the wild type one. The arrangement status of the mutant internode was long short alternative distribution, the phyllotaxis was similar to the opposite phyllotaxis. The reciprocal cross F1 was constructed by crossing mutant HL-fu and wild type HL, the genetics of the groups of cross F2, BC1(P1)1F1 and BC1(P2)F1 were analyzed. We speculated that the variation type was recessive mult-effect single gene mutant, the mutant character was controlled by a pair of recessive nuclear gene fu. We discussed the potential value of fusiform fruit mutant on the pumpkin breeding and the basic study.