Abstract
The differential responses of the wheat cultivars Shi4185 and Yumai47 to salinity were studied. The higher sensitivity of Yumai47 to salinity was linked to a greater growth reduction under salt stress, compared to more salt-tolerant Shi4185. Salinity increased the Na+, proline and superoxide anion radical (O2 −) contents in both cultivars. Leaf Na+ content increased less in the more salt-tolerant cultivar Shi4185 than salt-sensitive Yumai47. The proline content increased more significantly in Shi4185 than Yumai47; on the contrary, superoxide anion radical content increased less in Shi4185 than Yumai47. This data indicated that wheat salinity tolerance can be increased by controlling Na+ transport from the root to shoot, associated with higher osmotic adjustment capability and antioxidant activity. Although salinity increased aldehyde oxidase (AO) activity and abscisic acid (ABA) content in the leaves and roots of both cultivars following the addition of NaCl to the growth medium, AO and ABA increased more in the salt-sensitive cultivar Yumai47 than the more salt-tolerant cultivar Shi4185. Xanthine dehydrogenase (XDH) activity in the leaves of both cultivars increased with increasing concentrations of NaCl; however, leaf XDH activity increased more significantly in Yumai47 than Shi4185. Root XDH activity in Shi4185 decreased with increasing NaCl concentrations, whereas salinity induced an increased root XDH activity in Yumai47. The involvement of AO and XDH enzymatic activities and altered ABA content in the response mechanisms of wheat to salinity are discussed herein.
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Acknowledgments
We thank Dr. Xi Huang for critical reading and improving English of the manuscript and Zhongdong Dong and Kehui Zhan for their excellent technical assistance. This work was supported by the grants from the Foundation of Hainan University and the National Natural Science Foundation of China (No. 31160185 and No. 31101207).
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Communicated by J.-H. Liu.
Haixia Xu and Jinling Zhai contributed equally to this work.
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Xu, H., Zhai, J., Liu, Y. et al. The response of Mo-hydroxylases and abscisic acid to salinity in wheat genotypes with differing salt tolerances. Acta Physiol Plant 34, 1767–1778 (2012). https://doi.org/10.1007/s11738-012-0974-2
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DOI: https://doi.org/10.1007/s11738-012-0974-2