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Molecular evolution of the maize sex-determining gene TASSELSEED2 in Bouteloua (Poaceae).

Abstract：

:The majority of angiosperms produce hermaphrodite flowers, while a lesser number (20-30%) produce unisexual flowers. Little is known about the molecular biology of sex-determination in angiosperms, however, a few sex-determining genes have been cloned from the model system Zea mays. One of these genes is Tasselseed2 (Ts2) which has been shown to be involved in the arrest of developing pistils in male flowers. In this study, we sequenced a putative homologue of Ts2 in species of Bouteloua, a genus in the grass subfamily Chloridoideae. We found significant genetic variation at Ts2 in Bouteloua relative to other developmental genes characterized in maize and other grass species. We also found that in Bouteluoua, Ts2 is evolving non-neutrally in the hermaphrodite-flowered Bouteloua hirsuta while no difference from neutral expectation was detected at Ts2 in the monoecious/dioecious Bouteloua dimorpha. The putatively neutral gene Alcohol Dehydrogenase1 (Adh1) was also examined for the same species of Bouteloua, and no departure from neutral expectation was detected. Our results suggest that purifying selection may be acting on Ts2 in the hermaphrodite-flowered B. hirsuta while no evidence of selection was detected at Ts2 in the monoecious/dioecious B. dimorpha.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Kinney MS,Columbus JT,Friar EA

doi

10.1016/j.ympev.2003.09.001

keywords:

subject

Has Abstract

pub_date

2003-12-01 00:00:00

pages

519-28

issue

3

eissn

1055-7903

issn

1095-9513

pii

S1055790303003415

journal_volume

29

pub_type

杂志文章

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