Plant genetic adaptedness to climatic and edaphic environment

Vega, M. Pérez de la

doi:10.1007/bf00022825

Cited by 23 publications

(9 citation statements)

References 49 publications

(36 reference statements)

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“…) or pollinators (Hoffmann et al . ); (iv) the absence of relationships between phenological variation and fitness in some locations; (v) fine‐scale environmental differentiation within populations and/or (vi) selection for phenotypic plasticity in natural habitats (Pérez de la Vega ); and (vii) inaccurate estimates of phenological variation in our greenhouse conditions. It is important to note that our estimation of natural variation in phenology was done under controlled standard greenhouse conditions.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the geographical scale of adaptive phenological variation and its underlying genetics in Arabidopsis thaliana

et al. 2013

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Despite the increasing number of genomic tools, identifying the genetics underlying adaptive complex traits remains challenging in the model species Arabidopsis thaliana. This is due, at least in part, to the lack of data on the geographical scale of adaptive phenotypic variation. The aims of this study were (i) to tease apart the historical roles of adaptive and nonselective processes in shaping phenological variation in A. thaliana in France and (ii) to gain insights into the spatial scale of adaptive variation by identifying the putative selective agents responsible for this selection. Forty-nine natural stands from four climatically contrasted French regions were characterized (i) phenologically for six traits, (ii) genetically using 135 SNP markers and (iii) ecologically for 42 variables. Up to 63% of phenological variation could be explained by neutral genetic diversity. The remaining phenological variation displayed stronger associations with ecological variation within regions than among regions, suggesting the importance of local selective agents in shaping adaptive phenological variation. Although climatic conditions have often been suggested as the main selective agents acting on phenology in A. thaliana, both edaphic conditions and interspecific competition appear to be strong selective agents in some regions. In a first attempt to identify the genetics of phenological variation at different geographical scales, we phenotyped worldwide accessions and local polymorphic populations from the French RegMap in a genome-wide association (GWA) mapping study. The genomic regions associated with phenological variation depended upon the geographical scale considered, stressing the need to account for the scale of adaptive phenotypic variation when choosing accession panels for GWAS.

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Section: Discussionmentioning

confidence: 99%

Investigation of the geographical scale of adaptive phenological variation and its underlying genetics in Arabidopsis thaliana

et al. 2013

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“…Water availability is known to impose strong selective pressure, as it is fundamental to almost all aspects of plant physiology (Stephenson 1990; Prentice et al . 1992; Bray 1994; Bohnert, Nelson & Jensen 1995; Pérez 1996). The above features may explain why the sensitive genotypes were found at this collection site.…”

Section: Discussionmentioning

confidence: 99%

Differential expression of dehydrin genes in wild barley, Hordeum spontaneum, associated with resistance to water deficit

Suprunova

Krugman

Fahima

et al. 2004

Plant Cell & Environment

117

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Dehydrin gene ( Dhn ) expression is associated with plant response to dehydration. The aim of the present study was to investigate the association of differential expression of Dhn genes ( Dhn 1, 3, 5, 6, and 9 ) with drought tolerance found in wild barley ( Hordeum spontaneum ). Tolerant and sensitive genotypes were identified from Israeli (Tabigha microsite) and Jordanian (Jarash and Waddi Hassa) populations (based on scoring of water loss rate of 390 genotypes). The five Dhn genes were up-regulated by dehydration in resistant and sensitive wild barley genotypes. Notably, differences between resistant and sensitive genotypes were detected, mainly in the expression of Dhn1 and Dhn6 genes, depending on the duration of dehydration stress. Dhn1 tended to react earlier (after 3 h) and higher (12 h and 24 h) in resistant compared to sensitive genotypes. The level of expression of Dhn6 was significantly higher in the resistant genotypes at the earlier stages after stress. However, after 12 and 24 h Dhn6 expression was relatively higher in sensitive genotypes. The present results may indicate that these genes have some functional role in the dehydration tolerance in wild barley. The authors suggest that the observed differences of Dhn expression in wild barley, originating from different micro-and macro ecogeographic locations, may be the result of adaptive edaphic and climatic selective pressures.

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“…This is an important result because there is now a growing body of empirical data suggesting that allozymes polymorphisms are not always neutral (Karl & Avise 1992; Begun & Aquadro 1994; Pogson et al . 1995; Pérez de la Vega 1996; Raybould et al . 1996; Latta & Mitton 1997; references therein).…”

Section: Discussionmentioning

confidence: 99%

Differentiation between natural and cultivated populations of Medicago sativa (Leguminosae) from Spain: analysis with random amplified polymorphic DNA (RAPD) markers and comparison to allozymes

1999

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The conservation of a crop's wild relatives as genetic resources requires an understanding of the way genetic diversity is maintained in their populations, notably the effect of crop-to-wild gene flow. In this study, the amount of differentiation between natural and cultivated populations of Medicago sativa was analysed using random amplified polymorphic DNA (RAPD) markers and an extension of the AMOVA procedure adapted to autotetraploid organisms. Simulations of structured populations were performed to test whether AMOVA provides estimates of population structure in autotetraploids that can be directly compared to those obtained for allozyme data. Simulations showed that straight phi-statistics allow a good estimation of population differentiation when unbiased allelic frequencies are used to correct the conditional expectations of squared genetic distances. But such unbiased estimates can not be practically guaranteed, and population structure is notably overestimated when some populations are fixed for the presence of amplified fragments. However, removing fixed loci from the data set improves the statistical power of the test for population structure. The genetic variation of 15 natural and six cultivated populations of M. sativa was analysed at 25 RAPD loci and compared to estimates computed with allozymes on the same set of populations. Although RAPD markers revealed less within-population genetic diversity than allozymes, the quantitative and qualitative patterns of population structure were in full agreement with allozymes. This confirmed the conclusions drawn from the allozymic survey: crop-to-wild gene flow occurred in many locations, but some other mechanisms opposed cultivated traits to be maintained into natural populations.

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Plant genetic adaptedness to climatic and edaphic environment

Cited by 23 publications

References 49 publications

Investigation of the geographical scale of adaptive phenological variation and its underlying genetics in Arabidopsis thaliana

Investigation of the geographical scale of adaptive phenological variation and its underlying genetics in Arabidopsis thaliana

Differential expression of dehydrin genes in wild barley, Hordeum spontaneum, associated with resistance to water deficit

Differentiation between natural and cultivated populations of Medicago sativa (Leguminosae) from Spain: analysis with random amplified polymorphic DNA (RAPD) markers and comparison to allozymes

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