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Phenotypic variation in caryopsis dormancy and seedling salt tolerance in wild barley, Hordeum spontaneum, from different habitats in Israel

Phenotypic variation in caryopsis dormancy and seedling salt tolerance in wild barley, Hordeum... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genetic Resources and Crop Evolution Springer Journals

Phenotypic variation in caryopsis dormancy and seedling salt tolerance in wild barley, Hordeum spontaneum, from different habitats in Israel

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References (50)

Publisher
Springer Journals
Copyright
Copyright © 2008 by Springer Science+Business Media B.V.
Subject
Life Sciences; Agriculture; Plant Physiology; Plant Genetics & Genomics; Plant Systematics/Taxonomy/Biogeography; Plant Sciences
ISSN
0925-9864
eISSN
1573-5109
DOI
10.1007/s10722-008-9307-0
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Genetic Resources and Crop EvolutionSpringer Journals

Published: Feb 9, 2008

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