The fertilization process in Lithocarpus dealbatus (Fagaceae) and its implication on the sexual reproduction evolution of Fagales

doi:10.1007/s00425-023-04178-0

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	The fertilization process in Lithocarpus dealbatus (Fagaceae) and its implication on the sexual reproduction evolution of Fagales
	Yao,Kaiping; Deng,Min; Lin,Lin; Hu,Jinjin; Yang,Xiaorui; Li,Qiansheng; Feng,Zhuo
	2023
发表期刊	PLANTA
ISSN	1432-2048
卷号	258 期号:2 页码:23
摘要	Main conclusionThe pistillate flowers of Lithocarpus dealbatus show two pollen tube (PT) arresting sites (the style-joining and micropyle) within the pistil during the postpollination-prezygotic stage. The PT, arrested at the pre-ovule stage, enhanced PT competition allowing the most compatible PTs to enter the ovary to ensure the highest fertilization success.During the shift from animal pollination to wind pollination, plants require a series of changes in reproductive traits. The mode of pollination is striking labile in Fagaceae. Lithocarpus is insect pollinated and is closely related to wind-pollinated Quercus. Little is known about the sexual reproduction of Lithocarpus. This study aimed to reveal the sexual reproduction of Lithocarpus dealbatus and to explore the evolutionary pattern of the key sexual reproduction traits to better understand their possible role in labile pollination. We found that after pollination, L. dealbatus PTs grew slowly in the style reaching style-joining in mid-January of the second year; then PT growth was arrested at style-joining for four months. Only two to three PTs resumed growth in mid-May to reach the micropyle, where PT growth ceased for one month before one PT resumed growth and passed through the micropyle to the embryo sac. Fagaceae showed a generalized mating system. Vast pollen production, small-sized pollen grains, long stigmatic receptive time, and reduced perianth were compatible with beetle pollination syndrome, representing the plesiomorphic status in Fagaceae. A large stigmatic surface and dry pollen grains linked to wind pollination might be independently derived several times in fagaceous lineages. Beetle pollination syndrome can cope with the uncertainty of pollinators to ensure conspecific pollen capture, which represents pre-adaptation status and has a selective advantage when conditions change, favouring wind pollination. The arrest of the PT at style-joining is a unique mechanism in later derived fagaceous lineages to enhance PT competition and promote outcrossing.
关键词	Adaptation Delayed fertilization Pollen tube growth Pollination mode Trait evolution POLLEN-TUBE GROWTH ACTING SELF-INCOMPATIBILITY WIND-POLLINATION PHYLOGENETIC ANALYSIS INSECT POLLINATION EMBRYO DEVELOPMENT MATING PATTERNS CASTANEA BIOLOGY MORPHOLOGY
学科领域	Plant Sciences
DOI	10.1007/s00425-023-04178-0
WOS记录号	WOS:001012447900001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74801
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Yao,Kaiping,Deng,Min,Lin,Lin,et al. The fertilization process in Lithocarpus dealbatus (Fagaceae) and its implication on the sexual reproduction evolution of Fagales[J]. PLANTA,2023,258(2):23.
APA	Yao,Kaiping.,Deng,Min.,Lin,Lin.,Hu,Jinjin.,Yang,Xiaorui.,...&Feng,Zhuo.(2023).The fertilization process in Lithocarpus dealbatus (Fagaceae) and its implication on the sexual reproduction evolution of Fagales.PLANTA,258(2),23.
MLA	Yao,Kaiping,et al."The fertilization process in Lithocarpus dealbatus (Fagaceae) and its implication on the sexual reproduction evolution of Fagales".PLANTA 258.2(2023):23.

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