Chromosomal regions controlling seedling drought resistance in Israeli wild barley, <Emphasis Type="Italic">Hordeum spontaneum</Emphasis> C. Koch |
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| Authors: | Guoxiong Chen Tamar Krugman Tzion Fahima Kegui Chen Yingang Hu Marion Röder Eviatar Nevo Abraham Korol |
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| Institution: | (1) Extreme Stress Resistance and Biotechnology Laboratory, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;(2) Institute of Evolution, University of Haifa, Mt. Carmel, Haifa, 31905, Israel;(3) Institute for Plant Genetics and Crop Plant Research (IPK), 06466 Gatersleben, Germany |
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| Abstract: | The objective of the present study was to map quantitative trait loci (QTL) controlling drought-resistance traits at seedling
stage of Israeli wild barley (Hordeum spontaneum). Mapping was conducted using an F4 mapping population derived from a cross between genotype WQ23-38 from xeric (Wadi Qilt, 144 mm annual rainfall) and MA10-30
from mesic (Maalot, 790 mm annual rainfall) environments. Obvious segregation was observed for traits including time to wilt,
leaf relative elongation rate, recovery rate, shoot regrowth, osmolarity, relative water content, leaf length, and root length
with the coefficient of variation ranging from 10 to 77%. Eighteen putative QTL effects were identified (at false discovery
rate = 10%) by single-trait analyses and confirmed by multi-trait analysis and multiple interval mapping using a new MultiQTL
package. The results of our study suggest that the xeric genotypes adopted survival strategies while the mesic genotypes adopted
growth-sustain strategies to cope with drought stress. |
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