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The coexistence of binucleate and trinucleate pollen in Mitrephora macclurei Weerasooriya & R. M. K (Annonaceae)

文献类型： 外文期刊

作者： Gan, Yangying 1 ; Xu, Fengxia 2 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Econ & Rural Dev, Guangzhou, Guangdong, Peoples R China

2.Chinese Acad Sci, South China Bot Garden, Key Lab Plant Resources Conservat & Sustainable U, Guangzhou, Guangdong, Peoples R China

3.Chinese Acad Sci, South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Guangzhou, Guangdong, Peoples R China

关键词： pollen nuclear number; trinucleate pollen; Schurhoff-Brewbaker law; Annonaceae

期刊名称：GRANA （ 影响因子：1.359； 五年影响因子：1.447 ）

ISSN： 0017-3134

年卷期： 2019 年 58 卷 2 期

页码：

收录情况： SCI

摘要： Pollen of angiosperms may be either binucleate or trinucleate at maturity. According to Schurhoff-Brewbaker law, the binucleate state is pleisomorphic occuring in about 70% of all angiosperms, while the trinucleate state is advanced occurring in about 30% of the angiosperms. The derivation of trinucleate pollen from binucleate pollen is irreversible, thus trinucleate or mixed pollen was considered uncommon in early lineage. In the present work, using conventional paraffin section method, the coexistence of both binucleate and trinucleate pollen in the same intact anther were observed in Mitrephora macclurei, a species belonging to the eumagnoliid family Annonaceae. The increasing number of plants with trinucleate or mixed pollen discovered in early lineages, as well as climatic introduced changes in nuclear number challenge analyses of ancestral state and evolution of pollen nuclear number in angiosperms.

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[1]The coexistence of binucleate and trinucleate pollen in Mitrephora macclurei Weerasooriya & R. M. K (Annonaceae). Gan, Yangying,Xu, Fengxia,Xu, Fengxia. 2019

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