Morpho-anatomical and physiological responses to waterlogging stress in different barley (Hordeum vulgare L.) genotypes
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Waterlogging is one of the major stresses limiting crop production worldwide. The understanding of the mechanisms of plant adaptations to waterlogging stress helps improve plant tolerance to stress. In this study, physiological responses and morpho-anatomical adaptations of seven different barley genotypes were investigated under waterlogging stress. The results showed that the waterlogging-tolerant varieties (TX9425, Yerong, TF58) showed less reduction in plant height, SPAD (soil–plant analyses development analyses) value, tillers, shoot and root biomasses than did the waterlogging-sensitive varieties (Franklin, Naso Nijo, TF57). Under waterlogging stress condition, the tolerant genotypes also showed a much larger number of adventitious roots than did the sensitive genotypes. More intercellular spaces and better integrated chloroplast membrane structures were observed in the leaves of the waterlogging-tolerant cultivars, which is likely due to increased ethylene content, decreased ABA content and less accumulation of O2.−. The ability to form new adventitious roots and intercellular spaces in shoots can also be used as selection criteria in breeding barley for waterlogging tolerance.
KeywordsBarley (Hordeum vulgare L.) Waterlogging Adventitious root Leaf aerenchyma Chloroplast ultrastructure
This research was funded by the National Natural Science Foundation of China (31571648), the National Barley and Highland Barley Industrial Technology Specially Constructive Foundation of China (CARS-05), the opening project of Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland (K2016-03), the funds institute of Agricultural Science in Jiangsu Coastal Areas (YHS201605), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Conflict of interest
The authors declare that they have no competing interests.
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