Responses of two endemic species of Hippophae at the Qinghai-Tibet Plateau to elevated CO2 concentration

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• 作者：F. Ma ; T. T. Xu ; M. F. Ji ; C. M. Zhao
• 关键词：biomass allocation ; leaf gas exchange ; leaf properties
• 刊名：Photosynthetica
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：53
• 期：3
• 页码：395-402
• 全文大小：661 KB
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• 作者单位：F. Ma (1)
  T. T. Xu (2)
  M. F. Ji (3)
  C. M. Zhao (3)
  
  1. New Technology Application, Research and Development Center, Ningxia University, Yinchuan, 750021, China
  2. School of Life Science, Ningxia University, Yinchuan, 750021, China
  3. State Key Laboratory of Grassland Agro-Ecosystem, Lanzhou University, Lanzhou, 730000, China
  
• 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

The responses of photosynthesis and growth to increasing CO2 concentration ([CO2]) were investigated in Hippophae gyantsensis and H. rhamnoides subsp. yunnanensis, which are endemic at the Qinghai-Tibet Plateau and phylogenetically related, but distributed parapatrically in divergent regions. Seedlings of the two species were grown at ambient [AC; 360 μmol(CO2) mol?] and elevated [EC; 720 μmol(CO2) mol?] [CO2] in growth chambers. The responses to EC were significantly different between the two species. EC induced an increase in photosynthesis, stomatal conductance, intrinsic water-use efficiency, apparent quantum efficiency, total dry mass, and a decrease in photorespiration rate, maximum carboxylation rate of Rubisco, and maximum electron transport rate in H. gyantsensis compared to those in H. rhamnoides subsp. yunnanensis. Moreover, a significant increase in leaf nitrogen content and a decrease in root/shoot ratio was also observed in H. gyantsensis. H. gyantsensis showed a significantly higher specific leaf area than that of H. rhamnoides through treatments. Relative to H. rhamnoides subsp. yunnanensis, H. gyantsensis showed a greater potential to increase photosynthesis and growth to cope with the increasing [CO2] and it might expand its distribution range in the future.