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首页> 外文期刊>Genetic Resources and Crop Evolution >Phenotypic variation in caryopsis dormancy and seedling salt tolerance in wild barley, Hordeum spontaneum, from different habitats in Israel
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Phenotypic variation in caryopsis dormancy and seedling salt tolerance in wild barley, Hordeum spontaneum, from different habitats in Israel

机译：以色列不同生境的野生大麦大麦大麦的颖果休眠和幼苗耐盐性表型变异

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摘要

The phenotypic variation in caryopsis dormancy and seedling salt tolerance was investigated in 16 wild barley ecotypes in Israel. Depth of dormancy, as reflected by the time to maximum germination percentage, ranged from 15 to 103 days under dormancy-break treatment. Lower dormancy was characteristic of the mesic ecotypes, whereas deeper dormancy was characteristic of the xeric ecotypes. Dormancy-break patterns were revealed by growth curves: the xeric ecotype showed an S-shaped curve, whereas the mesic ecotype displayed a reverse L-shaped curve. Seedling salt tolerance was assessed by the ratio of root or coleoptile length in a seedling grown in 100 or 200 mM NaCl solution to that of a seedling grown in water. The root- and coleoptile-length ratios of mesic ecotypes were much higher than that of the xeric ecotypes, except that there was no observable difference in coleoptile-length ratio at 100 mM NaCl. The mesic ecotype was more tolerant to salt than the xeric ecotype at the young seedling stage, and seedling salt tolerance was negatively correlated with caryopsis dormancy depth. Thus evolutionary background environments have had a strong effect on the intensity of caryopsis dormancy in wild barley. Through natural selection, wild barley has adapted to dry and hot environments by increasing dormancy but not young seedling salt tolerance.
机译：在以色列的16种野生大麦生态型中研究了颖果休眠和幼苗耐盐性的表型变异。达到最大萌发百分比的时间所反映的休眠深度在休眠中断处理下为15到103天。较低的休眠是陆生生态型的特征，而较深的休眠是旱生生态型的特征。休眠中断模式通过生长曲线显示：干性生态型显示为S形曲线，而中型生态型显示为反向L形曲线。通过在100或200 mM NaCl溶液中生长的幼苗与在水中生长的幼苗的根或胚芽鞘长度的比率来评估幼苗的耐盐性。除100mM NaCl时胚芽鞘长度比没有明显差异外，中生生态型的胚芽鞘和胚芽鞘长度比远高于旱生生态型。在幼苗期，中生生态型比干旱生态型对盐的耐受性更高，并且幼苗对盐的耐受性与颖果休眠深度呈负相关。因此，进化背景环境对野生大麦的颖果休眠强度有很大的影响。通过自然选择，野生大麦通过增加休眠能力而不适应幼苗的幼苗耐盐性，从而适应了干燥和炎热的环境。

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