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Inheritance of sex forms in watermelon (Citrullus lanatus)

文献类型： 外文期刊

作者： Ji, Gaojie 1 ; Zhang, Jie 2 ; Gong, Guoyi 2 ; Shi, Jianting 2 ; Zhang, Haiying 3 ; Ren, Yi; Guo, Shaogui; Gao, Junp 1 ;

作者机构： 1.China Agr Univ, Dept Vegetable Sci, Coll Agron & Biotechnol, Beijing 100193, Peoples R China

2.Beijing Key Lab Vegetable Germplasm Improvement, Key Lab Biol & Genet Improvement Hort Crops North, Beijing Acad Agr & Forestry Sci,Minist Agr, Beijing Vegetable Res Ctr,Natl Engn Res Ctr Veget, Beijing 100097, Peoples R China

3.Beijing Key Lab Vegetable Germplasm Improvement, Key Lab B

关键词： Watermelon;Sex forms;Inheritance;Epistasis;F-1 Hybrid;Sex expression

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

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收录情况： SCI

摘要： Inheritance of sex forms in watermelon (Citrullus lanatus) is not well described. In this study, we made five pairs of crosses of watermelon plants with different sex forms and grew progeny in two different seasons to investigate the inheritance of sex forms and the seasonal effect on sex expression. We showed that environmental factors have no effect on sex forms, but they affect sex expression on individual flowers as more pistillate flowers were observed in spring than in autumn. This suggests that short photoperiod and low temperatures promote formation of pistillate flowers in watermelon. In the F-2 population of the cross of andromonoecious (SL3H or AKKZW) x monoecious (XHB), the segregation ratio is 9 monoecious: 3 trimonoecious: 4 andromonoecious, and the segregation ratio in BC1P1 (F-1 x andromonoecious parent) is 1 monoecious: 1 trimonoecious: 2 andromonoecious. The segregation ratio in the F-2 population of the gynoecious (XHBGM) x monoecious (XHB) is 3 monoecious: I gynoecious whereas the segregation ratio in the BC1P1 (F-1 x gynoecious parent) is 1 monoecious: 1 gynoecious. The segregation ratio in the F-2 population of gynoecious x andromonecious cross is 27 monoecious: 12 andromonoecious: 9 gynoecious: 9 trimonoecious: 4 hermaphroditic: 3 gynomonoecious. The segregation ratio in the BC1P1 population (F1 x gynoecious) is 1 monoecious: 1 gynoecious whereas the segregation ratio in the BC1P2 (F-1 x andromonoecious) is 1 monoecious: 1 trimonoecious: 2 andromonoecious. Taken together, the results suggested that three recessive alleles, andromonoecious (a), gynoecious (gy) and trimonoecious (tm) control the sex forms in watermelon, and a allele is epistatic to the tm allele. The following phenotype-genotype relationships are proposed for each of the sex forms in watermelon: monoecious, A_Gy_Tm_; trimonoecious, A_Gy_tmtm; andromonoecious, aaGy_Tm_ or aaGy_tmtm; gynoecious,A,gygyTm_; gynomonoecious, A_gygytmtm; and hermaphroditic, aagygyTm_ or aagygytmtm. (C) 2015 Elsevier B.V. All rights reserved.

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