Population genetic structure of two Medicago species shaped by distinct life form, mating system and seed dispersal

Yan, Juan; Chu, Hai-Jia; Wang, Hengchang; Li, Jianqiang; Su, Tao

doi:10.1093/aob/mcp006

Cited by 43 publications

(39 citation statements)

References 64 publications

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“…Moreover, the coiled pod morphology represents a change in seed dispersal strategies with a likely impact on population structures and fitness (Heyn, 1963;Lesins and Lesins, 1979;Polhill, 1994;Levin et al, 2003;Yan et al, 2009). The possible evolutionary advantages of the novel pod morphology in Medicago spp.…”

Section: Discussionmentioning

confidence: 99%

A Change inSHATTERPROOFProtein Lies at the Origin of a Fruit Morphological Novelty and a New Strategy for Seed Dispersal inMedicagoGenus

et al. 2013

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Angiosperms are the most diverse and numerous group of plants, and it is generally accepted that this evolutionary success owes in part to the diversity found in fruits, key for protecting the developing seeds and ensuring seed dispersal. Although studies on the molecular basis of morphological innovations are few, they all illustrate the central role played by transcription factors acting as developmental regulators. Here, we show that a small change in the protein sequence of a MADS-box transcription factor correlates with the origin of a highly modified fruit morphology and the change in seed dispersal strategies that occurred in Medicago, a genus belonging to the large legume family. This protein sequence modification alters the functional properties of the protein, affecting the affinities for other protein partners involved in high-order complexes. Our work illustrates that variation in coding regions can generate evolutionary novelties not based on gene duplication/subfunctionalization but by interactions in complex networks, contributing also to the current debate on the relative importance of changes in regulatory or coding regions of master regulators in generating morphological novelties.

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Section: Discussionmentioning

confidence: 99%

A Change inSHATTERPROOFProtein Lies at the Origin of a Fruit Morphological Novelty and a New Strategy for Seed Dispersal inMedicagoGenus

et al. 2013

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“…Gene flow by pollen or seed dispersal, neutral genetic drift and natural selection are among the most important evolutionary forces shaping the genetic diversity of plant populations at different spatial scales (Loveless and Hamrick 1984). Gene flow is strongly dependent on the structure of the landscape, breeding system, pollination vectors and adaptations of seeds for dispersal (Kalisz et al 2001;Gaudeul et al 2007;Yan et al 2009). Since gene flow is more likely among geographically close populations, isolation by distance (IBD; Hutchison and Templeton 1999) can create spatial genetic structure.…”

Section: Introductionmentioning

confidence: 99%

High genetic differentiation in populations of the rare alpine plant species Campanula thyrsoides on a small mountain

Frei

Stöcklin

2012

Alp Botany

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Changes in climate and traditional land use have contributed to a loss and fragmentation of suitable habitats for many alpine plant species. Despite the importance of these changes, our knowledge of the consequences for gene flow and genetic diversity is still poor, especially in rare taxa and at fine spatial scales. Here, we investigated the genetic diversity in a rare alpine plant on a small and highly structured mountain in the Swiss Alps. Using microsatellite markers and Bayesian cluster analyses, we investigated genetic diversity within and among 24 populations of Campanula thyrsoides L. We also tested whether landscape structure has affected genetic structure by correlating genetic diversity with landscape and population features, which were assessed in a four-year monitoring period. The recorded genetic diversity (H e = 0.714) and genetic differentiation (G 0 ST = 0.32) at distances of 1-10 km were remarkably high. Clustering analyses revealed a split of populations into two genetically different spatial groups, but between-population genetic distances were neither correlated to geographic distance, elevation nor slope. The high differentiation and genetic bottlenecks may indicate strong founder effects, although the number of alleles was not decreased in bottlenecked populations. We conclude that stochastic colonisation by seeds is most important for shaping the genetic structure of C. thyrsoides on this small mountain. The high genetic diversity even in small populations may indicate that occasional gene flow is strong enough to overcome negative effects of bottlenecks. Nevertheless, further fragmentation and isolation of habitats may threaten this rare plant in the future.

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“…It revealed that geographic origin was not related to genotypic similarity among populations. However, in controversial reports, Mengoni et al (2000) and Yan et al (2009) detected the significantly positive correlation between genetic and geographical distances in M. sativa and M. lupulina populations with different geographical origins, respectively. In general they found a tendency for closely situated populations to be genetically more similar.…”

Section: Discussionmentioning

confidence: 86%

Comparison of phenotypic trait variation and total protein polymorphism in local and exotic germplasms ofMedicago sativain Iran

Shanjani¹,

Salehi²,

Jafari³

2013

New Zealand Journal of Agricultural Research

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The genetic diversity of 27 wild alfalfa (Medicago sativa L.) populations from seven different countries (Iran, US, Australia, France, Italy, Turkey and Kazakhstan) was studied using total protein profiles and phenotypic traits. High genetic variation was observed for both total protein profiles and phenotypic traits. AMOVA using total protein profiles revealed no variation between local and exotic populations; however, variance between populations and within populations accounted for 33% and 67% of the total variation, respectively. UPGMA was conducted using total protein profiles. All local and exotic wild populations were more or less scattered indicating shared protein profiles that might be due to common parentage or gene flow. The protein banding data were investigated in relation to phenotypic traits and indicated no influence of polymorphic bands on quantitative traits. Latitude, longitude and altitude of origin were not correlated with either genetic or phenotypic distances among Iranian populations.

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Population genetic structure of two Medicago species shaped by distinct life form, mating system and seed dispersal

Cited by 43 publications

References 64 publications

A Change inSHATTERPROOFProtein Lies at the Origin of a Fruit Morphological Novelty and a New Strategy for Seed Dispersal inMedicagoGenus

A Change inSHATTERPROOFProtein Lies at the Origin of a Fruit Morphological Novelty and a New Strategy for Seed Dispersal inMedicagoGenus

High genetic differentiation in populations of the rare alpine plant species Campanula thyrsoides on a small mountain

Comparison of phenotypic trait variation and total protein polymorphism in local and exotic germplasms ofMedicago sativain Iran

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