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Drought tolerance of Periploca sepium during seed germination: antioxidant defense and compatible solutes accumulation

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Abstract

Periploca sepium Bunge is a native and widespread shrub on the Loess Plateau, an arid and semi-arid region in China. To understand the adaptability of its seed germination to dry environments, we investigated the germination rate, water relations, lipid peroxidation, antioxidant capacity and accumulation of major organic solutes during seed germination under water deficit conditions. Results showed that seeds pre-treated by hydration–dehydration or −0.9 MPa PEG germinated faster than control seeds, indicating strong resistance of P. sepium to drought condition. The re-dried seeds showed higher proline, total free amino acids (TFAA) and soluble proteins (SP) contents than control dry seeds, indicating the maintenance of physiological advancement when dehydrated. Osmotic stress made seed germination stay on the plateau phase (phase II). However, germinating seeds moved into phase III immediately once transferred into distilled water. Large increases in SP and soluble sugars (SS) of both re-dried and osmotic stressed seeds help themselves to resist drought stress. The re-hydrated seeds showed significantly higher levels of proline, TFAA, SP and SS than control seeds. The largely accumulated SS during osmotic stress declined sharply when transferred into distilled water. Our data demonstrate that P. sepium’s tolerance to drought stresses during germination is associated with enhanced activity of antioxidant enzymes and accumulation of some compatible solutes. Seed physiological advancement progressed slowly under low water conditions and it was maintained when seeds were air dried. This strategy ensures high and more rapid seed germination of P. sepium under drying and wetting conditions in drought-prone regions.

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Acknowledgments

We thank supports of the knowledge innovation project of Chinese Academy of Science (KZCX2-YW-443) and the National Key Technology R&D Program of China (2008BAD98B08).

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Authors and Affiliations

  1. College of Life Sciences, Northwest A&F University, Yangling, 712100, Shaanxi, People’s Republic of China

    Yuyan An & Zongsuo Liang

  2. School of Life science, Zhejiang Sci-Tech University, Hangzhou, 310018, Zhejiang, People’s Republic of China

    Zongsuo Liang

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  1. Yuyan An
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  2. Zongsuo Liang
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Correspondence to Zongsuo Liang.

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Communicated by J. van Staden.

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An, Y., Liang, Z. Drought tolerance of Periploca sepium during seed germination: antioxidant defense and compatible solutes accumulation. Acta Physiol Plant 35, 959–967 (2013). https://doi.org/10.1007/s11738-012-1139-z

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  • DOI: https://doi.org/10.1007/s11738-012-1139-z

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