AFLP genetic polymorphism in wild barley (Hordeum spontaneum) populations in Israel

Turpeinen, Timo; Vanhala, Tytti; Nevo, Eviatar; Nissilä, Eero

doi:10.1007/s00122-002-1151-6

Cited by 58 publications

(35 citation statements)

References 33 publications

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“…Most of the differentiation (95%) was present within accessions. This could be due to the natural selection and gene flow as it had been reported in many studies (Turpeinen et al, 2003;Nevo et al, 2004;Shakhatreh et al, 2015). According to Nevo et al (1998), natural selection appears to be a major differentiating and orienting force of regional evolutionary change, maintaining genetic polymorphisms under conditions of environmental heterogeneity and stress.…”

Section: Discussionmentioning

confidence: 97%

Assessment of genetic diversity among cultivated Pearl millet (Pennisetum glaucum, Poaceae) accessions from Benin, West Africa

Adéoti¹,

Djèdatin²,

Ewedje³

et al. 2017

Afr. J. Biotechnol.

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Simple sequence repeat (SSR) molecular markers were used for genetic diversity analysis and population structure of the cultivated Pearl millet in Benin, West Africa. In order to assess the level of genetic diversity, 14 polymorphic SSR markers were used to screen 114 accessions from different agroecological zones in Benin. SSR markers were found to reveal a total of 57 alleles with an average of 4.071 allele per locus. Genetic diversity index varied from 0.099 to 0.633 with an average of 0.405. The average observed heterozygosity was found to reach 0.425. The analysis of molecular variance showed no real differentiation between regions. Only 5% of genetic variation was observed between samples collected from north-eastern and north-western region. A high level of variation (95%) was observed among accessions. Moreover, both principal component analysis (PCA) and the dendrogram obtained from the genetic distance among accessions revealed the absence of any specific structuration of accessions from each region under study. Our results confirmed diversity among cultivated Pearl millet in Benin and such diversity is not clustering according to geographical patterns.

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Section: Discussionmentioning

confidence: 97%

Assessment of genetic diversity among cultivated Pearl millet (Pennisetum glaucum, Poaceae) accessions from Benin, West Africa

Adéoti¹,

Djèdatin²,

Ewedje³

et al. 2017

Afr. J. Biotechnol.

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“…This species has been intensively studied for the extent and structure of genetic diversity at a wide range of spatial scales from tens to hundreds and even thousands of kilometers (Brown et al, 1978a;Turpeinen et al, 2001Turpeinen et al, , 2003Volis et al, 2001bVolis et al, , 2002aVolis et al, , 2003Volis et al, , 2005Morrell et al, 2003). At large geographical scale, selection and colonization history are predominant evolutionary forces, and a great deal of information about these processes has been gained for wild barley.…”

Section: Introductionmentioning

confidence: 99%

Fine-scale spatial genetic structure in a predominantly selfing plant: role of seed and pollen dispersal

2009

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We present a study of fine-scale spatial genetic structure (SGS) and assess the impact of seed and pollen dispersal on the pattern of genetic diversity in the predominantly selfing Hordeum spontaneum. The study included (1) direct measurement of dispersal in a controlled environment, and (2) analyses of SGS and estimation of the ratio of pollen to seed flow in three natural populations sampled in linear transects at fixed increasing inter-plant distances. Analysis of SGS with 10 nuclear SSRs showed in all three populations a significant autocorrelation for the distance classes of 1 or 2 m and a negative linear relationship between kinship coefficients, calculated for pairs of individuals, and logarithm of geographical distance between members of the pairs. Major seed dispersal (95%) was found to be within 1.2 m from the mother plant. Pollen flow, estimated from the comparison of nuclear and chloroplast variation, was spatially limited as much as was seed dispersal, and tended to be overestimated when measured at spatial scales exceeding that of SGS. We conclude that combined effects of selfing, occasional outcrossing, localized seed dispersal and high plant density create an equilibrium between drift and gene flow in this species resulting in SGS at a very fine spatial scale.

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“…Varied patterns of polymorphism and geographic structure are reported at different wild barley loci (12,13). Selective association between genetic diversity in wild barley and ecogeographical factors has been shown by using applied fragment length polymorphism (14,15) and microsatellite (16,17) markers. We report here a study of diversity in the coding region of the Isa gene at the DNA sequence level.…”

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confidence: 99%

Adaptive climatic molecular evolution in wild barley at the Isa defense locus

Cronin

Bundock

Henry

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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Wild barley (Hordeum spontaneum) represents a significant genetic resource for crop improvement in barley (Hordeum vulgare) and for the study of the evolution and domestication of plant populations. The Isa gene from barley has a putative role in plant defense. This gene encodes a bifunctional ␣-amylase/subtilisin inhibitor that inhibits the bacterial serine protease subtilisin, fungal xylanase, and the plant's own ␣-amylase. The inhibition of plant ␣-amylases suggests this protein may also be important for grain quality from a human perspective. We identified 16 SNPs in the coding region of the Isa locus of 178 wild barley accessions from eight climatically divergent sites across Israel. The pattern of SNPs suggested a large number of recombination events within this gene, indicating that the low-outcrossing rate of wild barley is not a barrier to recombinant haplotypes becoming established in the population. Seven amino acid substitutions were present in the coding region. Genetic diversity for each population was calculated by using Nei's diversity index, and a Spearman rank correlation was carried out to test the association between gene diversity and 16 ecogeographical factors. Highly significant correlations were found between diversity at the Isa locus and key water variables, evaporation, rainfall, humidity, and latitude. The pattern of association suggests selective sweeps in the wetter climates, with resulting low diversity and weaker selection or diversifying selection in the dryer climates resulting in much higher diversity.climatic selection ͉ crop improvement ͉ Hordeum spontaneum ͉ Isa molecular polymorphism

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AFLP genetic polymorphism in wild barley (Hordeum spontaneum) populations in Israel

Cited by 58 publications

References 33 publications

Assessment of genetic diversity among cultivated Pearl millet (Pennisetum glaucum, Poaceae) accessions from Benin, West Africa

Assessment of genetic diversity among cultivated Pearl millet (Pennisetum glaucum, Poaceae) accessions from Benin, West Africa

Fine-scale spatial genetic structure in a predominantly selfing plant: role of seed and pollen dispersal

Adaptive climatic molecular evolution in wild barley at the Isa defense locus

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