首页|Mechanisms of reproductive isolation between annual and perennial plants of Incarvillea sinensis

Mechanisms of reproductive isolation between annual and perennial plants of Incarvillea sinensis

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Quantifying the relative strength of isolating barriers is a major focus of research on plant speciation.Contrasting life histories and mating systems have the potential to limit gene exchange between closely related populations growing in sympatry.However,few studies have quantified reproductive isolating barriers between conspecific annual and perennial populations and their contributions to total reproductive isolation(RI).Incarvillea sinensis Lam.(Bignoniaceae)is an insect-pollinated herb with largely allopatric annual and perennial populations that differ in mating systems.The perennial populations are primarily outcrossing whereas annual populations are predominantly selfing.At a rare sympatric site in northern China we estimated prezygotic and postzygotic barriers to gene exchange between annual and perennial plants and found complete Rl between the two life histories.Annuals exhibited significantly higher ecogeographic isolation than perennials whereas perennials experienced more isolation through pollen-pistil interactions than annuals.Crosses between annuals and perennials demonstrated that postzygotic barriers influencing fruit and seed formation,F1 germination and survival were negligible for annuals but played a small role for perennials.However,F,hybrids of crosses between annuals and perennials produced no pollen and their ovules were largely sterile.Our study provides insight into the relative importance of prezygotic and postzygotic isolating barriers between closely related annual and perennial populations of I.sinensis and some of these barriers could have been involved with speciation.Annuals and perennials of I.sinensis represent two biological species and thus deserve to be recognized as distinct taxonomic species.

asymmetric barriers to gene exchangeIncarvillea sinensislife historymating systemreproductive isolation

Wen-Juan Lan、Fang-Yuan Wang、Spencer C.H.Barrett、Wen-Ting Wang、Yue Ma、Yang Yang、Nan Li、Jun-Chen Deng、Wei-Ning Bai

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Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,College of Life Sciences,Beijing Normal University,Beijing 100875,China

Department of Ecology and Evolutionary Biology,University of Toronto,Toronto M5S 3B2,ON,Canada

School of Mathematics and Computer Science,Northwest Minzu University,Lanzhou 730030,China

Institute of Environmental Sciences,Faculty of Biology,Jagiellonian University,Gronostajowa 7,Kraków 30-387,Poland

Doctoral School of Exact and Natural Sciences,Jagiellonian University,Gronostajowa 7,Kraków 30-387,Poland

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key project of the State Key Laboratory of Earth Surface Processes and Resource Ecology加拿大自然科学与工程研究委员会项目国家自然科学基金the"111"Program of Introducing Talents of Discipline to Universities

32170223B13008

2024

10.1111/jse.12997

植物分类学报
中国科学院植物研究所　中国植物学会

植物分类学报

CSTPCD
影响因子：0.322
ISSN：1674-4918
年,卷(期)：2024.62(3)
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