Divergence and reproductive isolation between two closely related allopatric Iris species
Volis, Sergei1; Zhang, Yong-Hong2; Deng, Tao1; Dorman, Michael3; Blecher, Michael4; Abbott, Richard J.5
Corresponding AuthorVolis, Sergei(svolis@gmail.com) ; Zhang, Yong-Hong(daphnecn@aliyun.com)
AbstractSpeciation involves the establishment of reproductive isolating barriers between diverging populations. Two closely related iris species, Iris atrofusca and Iris mariae, have non-overlapping geographical distributions characterized by differences in soil type and precipitation. We aimed to obtain a better understanding of pre- and postzygotic isolating barriers between these two species and the possible role of habitat-specific selection in preventing gene flow between them. We examined molecular genetic (AFLP) and phenotypic divergence and conducted species distribution modelling, tests for local adaptation and crossing experiments on the two species. The two species were found to be clearly divergent genetically and phenotypically from each other. Species distribution modelling further showed that each species distribution was largely associated with climate and soil type and that the area predicted to be shared by both species was very narrow, resulting in very high estimates of ecogeographical isolation. In contrast, other isolating barriers examined were either weak (flowering time differences) or absent (related to immigrant inviability and reduced fitness of hybrids generated from reciprocal crosses). Each species showed no home advantage in a reciprocal transplant analysis and little preference for indigenous soil type and water regime in experimental tests of this, thus indicating an absence of local adaptation. Reproductive isolation between the two iris species appears almost entirely attributable to geographical isolation unlinked to local adaptation. However, more detailed studies are required before local adaptation is dismissed as a cause of species divergence and occupation of contrasting habitats.
KeywordIris natural selection Oncocyclus reproductive isolation speciation
Indexed BySCI
WOS IDWOS:000485137700015
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Document Type期刊论文
Corresponding AuthorVolis, Sergei; Zhang, Yong-Hong
Affiliation1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Div & Biogeog East Asia, Kunming 650204, Yunnan, Peoples R China
2.Yunnan Normal Univ, Life Sci Dept, Kunming 650500, Yunnan, Peoples R China
3.Ben Gurion Univ Negev, Geog Dept, IL-84105 Beer Sheva, Israel
4.Israel Nat & Pk Author, En Gedi Nat Reserve, IL-86980 Dead Sea, Israel
5.Univ St Andrews, Sch Biol, Harold Mitchell Bldg, St Andrews KY16 9TH, Fife, Scotland
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Volis, Sergei,Zhang, Yong-Hong,Deng, Tao,et al. Divergence and reproductive isolation between two closely related allopatric Iris species[J]. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY,2019,127(2):377-389.
APA Volis, Sergei,Zhang, Yong-Hong,Deng, Tao,Dorman, Michael,Blecher, Michael,&Abbott, Richard J..(2019).Divergence and reproductive isolation between two closely related allopatric Iris species.BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY,127(2),377-389.
MLA Volis, Sergei,et al."Divergence and reproductive isolation between two closely related allopatric Iris species".BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 127.2(2019):377-389.
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