Physiological acclimation of two psammophytes to repeated soil drought and rewatering

• Autorzy: Luo Y. , Zhao X. , Zhou R. , Zuo X. , Zhang J. , Li Y.
• Języki publikacji: EN

Abstrakty

EN

To understand physiological acclimation of psammophyte to repeated soil drought and rewatering, two psammophytes (Setaria viridis and Digitaria ciliaris) were subjected to three cycles of soil drought and rewatering. The response process of leaf relative water content (RWC), membrane permeability, lipid peroxidation, gas exchange characteristics, antioxidant enzymes, soluble protein, and free proline was examined. Leaf RWC, the net photosynthesis rate, stomatal conductance, and water use efficiency decreased, while membrane permeability, lipid peroxidation, intercellular CO₂ concentration, soluble protein, and free proline increased during three soil drought periods for both psammophytes. These physiological characteristics were recovered to the control levels following rewatering for 4 days. However, activities of SOD, CAT, and POD were induced continuously under soil drought conditions, and remained higher than those in the control throughout the whole experiment period, which agrees with our hypothesis that drought hardening activates defensive systems of both psammophytes continuously. Decreasing level of leaf RWC and increasing levels of leaf membrane permeability and lipid peroxidation were suppressed with increasing the number of drought cycles, suggesting that drought hardening alleviates damages of both psammophytes and improves their drought tolerance and acclimation to soil drought conditions in the future. Additionally, the photosynthesis decreased more slowly in the subsequent drought cycles than in the first cycle, allowing both psammophytes to maximize assimilation in response to repeated soil drought conditions. Thus, both psammophytes acclimatize themselves to repeated soil drought.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2011
• Tom: 33
• Numer: 1
• Opis fizyczny: p.79-91,fig.,ref.

Twórcy

autor

Luo Y.

• Graduate University of Chinese Academy of Sciences, Beijing 100049, China

autor

Zhao X.

• Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciennces, no320 Donggang Road, Lanzhou 730000, Gansu, China

autor

Zhou R.

• Department of Biological Science and Biotechnology, Ludong University, Yantai 264025, China

autor

Zuo X.

autor

Zhang J.

autor

Li Y.

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