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ID 57909
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8
Title Alternative
Sexuality in plants, unveiled from genome evolution
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Author
Akagi, Takashi Kaken ID researchmap
Abstract
Sexual polymorphism, a main strategy to maintain genetic diversity within a species, has long been a major focus in biology. Notwithstanding, in plants, evolution of sexual systems and mechanisms underlying these transitions have been little unveiled. We have elucidated the molecular mechanism of sex determination in persimmons (Diospyros spp.), where the Y-encoded smRNA gene OGI can repress the female-determining gene MeGI, and also in kiwifruits (Actinidia spp.), where the Y-encoded two sex determinants, Shy Girl and Friendly Boy, control gynoecium and androecium development, respectively. Although the molecular functions of these determinants are distinct, they have common evolutionary scenarios involving transitions of sexual systems. In persimmon, a recent genome triplication (hexaploidization) in cultivated persimmon (D. kaki) derived “flexible” sexuality via establishing epigenetic layers on the two sex determinants. On the other hand, an ancient Diospyros-specific paleo-genome duplication (paleo-tetraploidization) enabled neofunctionalization in the proto-MeGI, via positive selection, to establish a new function as a sex determinant. In kiwifruit, one of the two sex determinants, Shy Girl, was derived from neofunctionalization via Actinidia-specific duplication event. These findings exemplify how plant-specific numerous duplication events can drive flexible genetic material whose variation can be selected for development of new sexual systems.
Keywords
Sex determination
Sex chromosome
Polyploidization
Genome evolution
Tree crops
Note
研究紹介 (Research Reports)
Publication Title
Scientific Reports of the Faculty of Agriculture, Okayama University
Published Date
2020-02-01
Volume
volume109
Publisher
岡山大学農学部
Publisher Alternative
The Faculty of Agriculture, Okayama University
Start Page
37
End Page
40
ISSN
2186-7755
Content Type
Departmental Bulletin Paper
OAI-PMH Set
岡山大学
language
日本語
File Version
publisher
Eprints Journal Name
srfa