Genetic resources of wild cereals in Israel and vicinity. II. Phenotypic variation within and between populations of wild barley, Hordeum spontaneum

Nevo, Eviatar; Beiles, Avigdor; Gutterman, Yitzchak; Storch, N.; Kaplan, Diane

doi:10.1007/bf00021901

Cited by 77 publications

(73 citation statements)

References 14 publications

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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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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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“…The ME population is characterized by fast-growing, early flowering plants that produce many small seeds (Nevo et al 1984;Elberse et al 2003;Verhoeven et al 2004aVerhoeven et al , 2004b, typical of the steppic and desert H. spontaneum ecotypes in Israel (Nevo et al 1984;Snow and Brody 1984;Volis et al 2002a). Compared to ME, plants from AQ produce bigger but fewer seeds and flower later and grow taller, which is typical of Mediterranean H. spontaneum populations in Israel (Nevo et al 1984;Snow and Brody 1984;Volis et al 2002a). Annual precipitation at both sites is low (AQ: 424 mm; ME: 270 mm; Nevo et al 1984); lower annual precipitation is associated with increasing unpredictability of precipitation events (Jaffe 1988;Volis et al 2002b).…”

Section: Plantsmentioning

confidence: 99%

“…Hordeum spontaneum, the recognized progenitor of cultivated barley (Zohary 1969), is a diploid, self-fertilizing annual grass species with generally low levels of outcrossing (Brown et al 1978) that occurs in Mediterranean and steppic vegetation types in the Near East Fertile Crescent and penetrates into favorable desert microhabitats (Harlan and Zohary 1966;Zohary 1969;Nevo et al 1979). Phenotypic and genetic variation among Israeli H. spontaneum populations are correlated to ecological and climatic factors (Nevo et al 1984;Snow and Brody 1984;Nevo et al 1986), and local adaptation at the regional scale is thought to be driven mainly by a north-to-south gradient of decreasing amount and predictability of precipitation (Nevo 1992;Volis et al 2002b). Although desiccation tolerance conceivably confers a greater fitness advantage in low-rainfall and low-predictability areas, empirical evidence to date does not consistently show that genotypes from xeric populations show higher desiccation tolerance than genotypes from mesic populations or even commercial barley cultivars (Gutterman and Gozlan 1998;Zhang et al 2002; but see Chen et al 2004).…”

Section: Introductionmentioning

confidence: 99%

“…This indicates that a larger endosperm volume may confer better protection of the embryo, or of basal meristematic tissue, against temporary drought. In H. spontaneum, populations from xeric environments typically produce smaller seeds than populations from mesic environments (Nevo et al 1984;Snow and Brody 1984;Volis et al 2002c), presumably because a trade-off between total seed number and mean seed mass has different adaptive outcomes in habitats that differ in predictability. It is thought that more intense seedling competition in mesic habitats has favored genotypes that produce big (but fewer) seeds, whereas increased benefits of germination risk-spreading in xeric habitats favored production of many (but smaller) seeds (Volis et al 2002a(Volis et al , 2002b.…”

Section: Introductionmentioning

confidence: 99%

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Can a Genetic Correlation with Seed Mass Constrain Adaptive Evolution of Seedling Desiccation Tolerance in Wild Barley?

Verhoeven¹,

Biere

Nevo

et al. 2004

International Journal of Plant Sciences

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Very young seedlings of wild barley Hordeum spontaneum have the ability to survive extended periods of severe drought. This desiccation tolerance is considered an adaptation to the rain-limited and unpredictable habitats that the species occupies. Genetic variation has been observed for this trait, but the limited evidence to date does not consistently show that genotypes from more xeric populations have better desiccation tolerance. As large seed endosperm volume may buffer the desiccating seedling from drought stress, we explored the hypothesis that tolerance to temporary but severe drought is affected by seed mass. We crossed a big-seeded with a small-seeded H. spontaneum genotype and measured seed mass and seedling survival rates after 6-d desiccation in 140 F 4 progeny families. A positive correlation was observed between family mean scores of the two traits. At the genetic level, this indicated that at least some genes underlying variation in the two traits overlapped (or show close chromosomal linkage), which is inevitable if seed mass causally affects desiccation tolerance. Quantitative Trait Loci (QTL) analysis, which can identify chromosome regions responsible for trait variation by exploring associations between trait expression and genetic markers dispersed over the genome, did not confirm this hypothesis of shared genetic control. Despite the lack of QTL evidence, the observed genetic association between seed mass and desiccation tolerance indicates that the two traits are not fully independent, implying that selection targeting one trait will cause a correlated response in the other. We discuss this finding in the context of adaptive differentiation of H. spontaneum populations, which is thought to involve selection of increasingly smaller seeds along a gradient of decreasing predictability and amount of annual precipitation.

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“…1). Ecogeographic data (Nevo et al, 1984(Nevo et al, , 1986aPakniyat et al, 1991 b) from the 39 sites were subjected to principal component analysis (PCA). The three-dimensional PCA using all the environmental data (Table 1; Fig.…”

Section: Approachmentioning

confidence: 99%

Locating genotypes and genes for abiotic stress tolerance in barley: a strategy using maps, markers and the wild species

Forster¹,

Russell²,

Ellis³

et al. 1997

New Phytologist

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SUMMARYThis paper reviews the results of several years' study by a multidisciplinarj? team comprising geneticists, physiologists, ecologists and statisticians of abiotic stress tolerance in barle5^ The strategy involves genetic fingerprinting of wild barley lines (Hordeum spontaneum C. Koch) from a range of habitats and testing these for responses to abiotic stresses under controlled conditions. Multiple regression analysis is used to identify genetic markers associated with experimentally determined stress responses. These data are related to site-of-origin ecogeographic data and used to identify areas of useful wild variation. Markers associated with traits of interest can be mapped in genetic mapping populations, revealing areas of the barley genome carrying genes controlling stress responses. This paper highlights our work on associations of amplied fragment length polymorphisms with salt tolerance and describes some initial results of the use of SSRs in studying drought tolerance in barley.

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Genetic resources of wild cereals in Israel and vicinity. II. Phenotypic variation within and between populations of wild barley, Hordeum spontaneum

Cited by 77 publications

References 14 publications

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

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

Can a Genetic Correlation with Seed Mass Constrain Adaptive Evolution of Seedling Desiccation Tolerance in Wild Barley?

Locating genotypes and genes for abiotic stress tolerance in barley: a strategy using maps, markers and the wild species

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