GENETIC DIVERSITY AND ENVIRONMENTAL ASSOCIATIONS OF WILD BARLEY,<i>HORDEUM SPONTANEUM</i>, IN ISRAEL

Nevo, Eviatar; Zohary, Daniel; Brown, A. H. D.; Haber, Michael

doi:10.1111/j.1558-5646.1979.tb04737.x

Cited by 106 publications

(77 citation statements)

References 21 publications

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“…The amount of genetic variation found in the Sitopsis species was similar to that found in most other autogamous plant species but the extent of genetic diversity was higher (Nevo et a!., 1979;Hamrick, 1983). In the tetraploid wild wheat, Triticum dicoccoides, Nevo et a!.…”

Section: Discussionmentioning

confidence: 63%

“…Selection over space can be both a macroor microhabitat phenomenon. Nevo et al (1982Nevo et al ( , 1988 found significant correlations between allele frequencies and climatological parameters in T dicoccoides, and Nevo et a!. (1979) in Hordeum spontaneum populations.…”

Section: Variation In Aegilops 625mentioning

confidence: 99%

“…As a model for obtaining information on these questions, few species or species groups are as good as the species of the wheat group (species of the Triticurn-Aegilops group in its broadest sense, including cultivated and wild wheats and goatgrasses; Zohary, 1965). The wild species have fairly well defined distributions; morphotypes have been described; in most species populations of different sizes can be easily found; and information on genetic variation in some species is already known (Zohary & Imber, 1963;Riley, 1965;Zohary, 1965;Sears, 1969;Segal eta!., 1980;Brody & Mendlinger, 1980;Nevo et a!., 1982Nevo et a!., , 1988. *Correspondence In addition to the wheat group's importance in understanding the above, the wild species are also important for our ability to introgress their economically useful genes into cultivated wheat (Zohary et a!., 1969;Dvorak et a!., 1985;Cox et a!., 1990;Dyck et the Sitopsis group have been the focus of a number of studies which have produced several possible phylogeny trees (Morris & Sears, 1967;Johnson, 1975;Feldman & Kislev, 1977;Brody & Mendlinger, 1980;Bahrman eta!., 1988;Vakhitov & Gimalov, 1988;Yen & Kiniber, 1990).…”

Section: Introductionmentioning

confidence: 99%

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The extent and structure of genetic variation in species of the Sitopsis group of Aegilops

Mendlinger

Zohary

1995

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The extent and structure of genetic variation in 21 populations covering the five species of the Sitopsis group of Aegilops were investigated by analysis of electrophoretically discernible water soluble leaf proteins. Sixteen loci were examined. All loci were polymorphic across the five species. Over 40 per cent of the alleles were found in all five species and only three rare alleles were speciesspecific. Genetic diversity was high (D = 0.267) with 51 per cent of the total diversity contributed by within-population diversity, 16 per cent by diversity between populations within a species and 33 per cent by diversity between species. Over all 21 populations the mean number of alleles per locus per population was 1.57 and the proportion of polymorphic loci was 0.38. Aegilops speltoides was genetically distant from the other four species, Ae. bicornis, Ae. longissima, Ae. searsii and Ae. sharonensis. Aegilops sharonensis was found to be equally close to Ae. longissima and Ae. bicornis. Aegilops searsii was equally distant from Ae. longissima, Ae. bicornis and Ae. sharonensis.

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Section: Discussionmentioning

confidence: 63%

Section: Variation In Aegilops 625mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The extent and structure of genetic variation in species of the Sitopsis group of Aegilops

Mendlinger

Zohary

1995

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“…A comparison with predominant selfers is limited to H. spontaneum (Ennos, 1994). A pollen/seed flow ratio for this species was calculated from the data of Nevo et al (1979) and Neale et al (1988) (f SN of 0.49 and f SC of 0.735, providing m p /m s ¼ 4) (Ennos, 1994), but this ratio should be treated with caution because of the large spatial scale (tens and hundreds of kilometers). In our study, the pollen/seed migration ratio, m p /m s, derived from the comparison of chloroplast and nuclear f ST , depended strongly on delineation of subpopulations.…”

Section: Discussion Sgs In a Predominant Selfermentioning

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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“…Positions of accessions and individual plants in each accession at the collection site were randomized and seed stocks from all accessions are maintained at the University of Haifa. Ecogeographic and climatic characteristics for each of the sampling locations have previously been documented by Nevo et al (1979Nevo et al ( , 1984 and Pakniyat et al (1997) (Table 1). Growth conditions at micro-sites are identical in all but one or two specific environmental characteristics (different microclimate and irradiation at the Evolution Canyon, different soil types at Tabigha and different soil depth/sun exposure at Neve Ya'ar).…”

Section: Plant Materialsmentioning

confidence: 99%

Correlation between hordatine accumulation, environmental factors and genetic diversity in wild barley (Hordeum spontaneum C. Koch) accessions from the Near East Fertile Crescent

et al. 2006

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Wild barley shows a large morphological and phenotypic variation, which is associated with ecogeographical factors and correlates with genotypic differences. Diversity of defense related genes and their expression in wild barley has been recognized and has led to attempts to exploit genes from H. spontaneum in breeding programs. The aim of this study was to determine the variation in the accumulation of hordatines, which are Hordeum-specific preformed secondary metabolites with strong and broad antimicrobial activity in vitro, in 50 accessions of H. spontaneum from different habitats in Israel. Differences in the accumulation of hordatines in the seedling stage were significant between different H. spontaneum genotypes from different regional locations and micro-sites. Variation in the hordatine accumulation within genotypes was between 9% and 45%, between genotypes from the same location between 13% and 38%, and between genotypes from different locations up to 121%. Principal component analysis showed that water related factors explain 39%, temperature related factors explain 33% and edaphic factors account for 11% of the observed variation between the populations of H. spontaneum. Genetic analysis of the tested accessions with LP-PCR primers that are specific for genes involved in the biosynthetic pathway of hordatines showed tight correlations between hordatine abundance and genetic diversity of these markers. Multiple regression analyses indicated associations between genetic diversity of genes directly involved in hordatine biosynthesis, ecogeographical factors and the accumulation of hordatines.

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GENETIC DIVERSITY AND ENVIRONMENTAL ASSOCIATIONS OF WILD BARLEY,HORDEUM SPONTANEUM, IN ISRAEL

Cited by 106 publications

References 21 publications

The extent and structure of genetic variation in species of the Sitopsis group of Aegilops

The extent and structure of genetic variation in species of the Sitopsis group of Aegilops

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

Correlation between hordatine accumulation, environmental factors and genetic diversity in wild barley (Hordeum spontaneum C. Koch) accessions from the Near East Fertile Crescent

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