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The Physiological Basis of Genotypic Variations in Low-Oxygen Stress Tolerance in the Vegetable Sweet Potato

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Abstract

Waterlogging caused by rainfall or improper irrigation is a serious threat that limits the growth and yield of crop plants by hypoxia stress. In the current study, the seedlings of vegetable sweet potato (Ipomoea batatas (L.) Lam.) variety ‘NC1’ (hypoxia-tolerant) and ‘C211’ (hypoxia-sensitive) were treated with oxygen content of 2 mg/L. It was found that the growth rate, net photosynthetic rate (PN), transpiration rate (E), stomatal limitation (Ls), maximum net photosynthetic rate (Amax), diurnal respiratory rate (Rd), maximum Rubisco carboxylation rate (Vcmax), maximum electron transport rate (Jmax), ABA (abscisic acid) and IAA (indole-3-acetic acid) content were significantly higher in ‘NC1’ than those of ‘C211’. It is concluded that under hypoxia stress, tolerant genotype could maintain higher photosynthetic efficiency by maintaining higher stomatal conductance and Rubisco efficiency, to maintain the growth of the root system and the canopy. This study provides the basis for further dissection of the mechanism of low-oxygen stress in sweet potato.

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ACKNOWLEDGMENTS

We are grateful to Bosong Yan for plant preparation and data collection, and Jingzhen Zhang for the chart layout.

Funding

This work was supported by National Key R&D Program of China (2018YFD1000700, 2018YFD1000705, 2019YFD1001300, 2019YFD1001305), Science and Technology Development Plan Project of Jingzhou City, Hubei Province, China (2018-37).

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    Authors and Affiliations

    1. Research Center of Crop Stresses Resistance Technologies/Engineering Research Centre of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, 434025, Jingzhou, China

      H. Han, R. Pan, S. Buitrago, Y. Peng, Y. Liu & W. Y. Zhang

    2. Agronomy Department, College of Agriculture, Assiut University, 71526, Assiut, Egypt

      S. F. Abou-Elwafa

    3. Hubei Sweet Potato Engineering and Technology Research Centre, Hubei Academy of Agricultural Sciences, 430064, Wuhan, China

      Y. Liu & X. S. Yang

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    1. H. Han
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    2. R. Pan
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    3. S. Buitrago
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    4. S. F. Abou-Elwafa
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    5. Y. Peng
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    6. Y. Liu
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    7. W. Y. Zhang
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    H. Han, R. Pan contributed equally to this work.

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    Correspondence to W. Y. Zhang or X. S. Yang.

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    Han, H., Pan, R., Buitrago, S. et al. The Physiological Basis of Genotypic Variations in Low-Oxygen Stress Tolerance in the Vegetable Sweet Potato. Russ J Plant Physiol 68, 1236–1246 (2021). https://doi.org/10.1134/S1021443721060054

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