Physiological and biochemical responses to saline-alkaline stress in two halophytic grass species with different photosynthetic pathways

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• 作者：C. Y. Guo (1)
  X. Z. Wang (2)
  L. Chen (3)
  L. N. Ma (1)
  R. Z. Wang (1)
  
  1. State Key Laboratory of Vegetation and Environmental Change ; Institute of Botany ; Chinese Academy of Sciences ; 20 Nanxincun ; Xiangshan ; Beijing ; 100093 ; China
  2. Department of Biology ; Indiana University-Purdue University Indianapolis ; 723 West Michigan Street ; Indianapolis ; Indiana ; 46202 ; USA
  3. College of Life Sciences ; Hubei Normal University ; 11 Cihu Road ; Huangshi ; Hubei ; 435002 ; China
  
• 关键词：ATP content ; gas exchange ; membrane permeability ; Na2CO3 stress ; proline ; salinity
• 刊名：Photosynthetica
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：53
• 期：1
• 页码：128-135
• 全文大小：442 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-9058

文摘

We examined the physiological and biochemical responses of two halophytic grasses with different photosynthetic pathways, Puccinellia tenuiflora (C3) and Chloris virgata (C4), to saline-alkaline stresses. Plants were grown at different Na2CO3 concentrations (from 0 to 200 mM). Low Na2CO3 (2CO3 concentrations (> 100 mM) reduced seed germination by 45% in P. tenuiflora and by 30% in C. virgata. Compared to C. virgata, P. tenuiflora showed lower net photosynthesis, stomatal conductance, intercellular CO2 concentration, and water-use efficiency under the same treatment. C. virgata exhibited also relatively higher ATP content, K+ concentration, and the K+/Na+ ratio under the stress treatments implying that salt tolerance may be the main mechanism for salt resistance in this species. Our results demonstrated that the C. virgata was relatively more resistant to saline-alkaline stress than the co-occurring P. tenuiflora; both two species adapt to their native saline-alkaline habitat by different physiological mechanisms.