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Drought stimulation by hypocotyl exposure altered physiological responses to subsequent drought stress in peanut seedlings

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Abstract

Drought stress occurring at the seedling stage of peanut (Arachis hypogaea L.) plants is a limiting factor resulting in considerable reductions in production. Plants can improve their resistance to subsequent stresses after experiencing an initial stress. The aim of this study was to explore the possible role of drought priming by hypocotyl exposure in alleviating subsequent severe drought stress in peanut. Hypocotyl exposure in peanut seedlings as a drought stimulus induced xerophytophysiological regulation, shown by induced osmotic adjustment, activated antioxidant enzymes, anthocyanin accumulation, up-regulation of Gdi-15 and fewer amyloplasts. The seedlings primed by hypocotyl exposure showed improved leaf water retention and reduced proline content when exposed to subsequent drought stress. The alleviated oxidative damage and lower antioxidant enzyme activities indicated rapid acclimation following past hypocotyl exposure and further defenses against subsequent drought stress by retaining ‘memories’ to enable more rapid or stronger physiological responses. The improved leaf photosynthesis and low photosynthetic hysteresis as drought ended indicated a positive effect of drought priming in peanut seedlings. The peanut seedlings ‘remembered’ the xerophytophysiological responses caused by the prior drought stimulation from hypocotyl exposure and displayed quicker and more potent physiological responses to following drought stress. The results showed that hypocotyl exposure could help peanut seedlings survive the severe environments that occurred in the later growth stages.

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Acknowledgements

The authors thank members of the International Nature Farming Research Center and the Laboratory of Environmental Stress Tolerance Mechanisms, the University of Tokyo, Japan, for their helpful comments on the experiments. Funding on this topic is provided by the Youth Scientific Research Foundation of Shandong Academy of Agricultural Sciences, China (No. 2015YQN18).

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Authors and Affiliations

  1. Shandong Peanut Research Institute, Wannianquan Road 126, Licang, Qingdao, 266100, China

    Feifei Qin

  2. International Nature Farming Research Center, Hata 5632-1, Matsumoto, 390-1401, Japan

    Feifei Qin & Hui-lian Xu

  3. Shandong Peanut Research Institute, Qingdao, 266100, China

    Dunwei Ci

Authors
  1. Feifei Qin
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  2. Hui-lian Xu
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  3. Dunwei Ci
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Correspondence to Feifei Qin.

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Communicated by J. Huang.

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Qin, F., Xu, Hl. & Ci, D. Drought stimulation by hypocotyl exposure altered physiological responses to subsequent drought stress in peanut seedlings. Acta Physiol Plant 39, 152 (2017). https://doi.org/10.1007/s11738-017-2447-0

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  • DOI: https://doi.org/10.1007/s11738-017-2447-0

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