Photosynthetica, 2015 (vol. 53), issue 3

Photosynthetica 2015, 53(3):395-402 | DOI: 10.1007/s11099-015-0125-2

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

F. Ma1, T. T. Xu2, M. F. Ji3, C. M. Zhao3,*
1 New Technology Application, Research and Development Center, Ningxia University, Yinchuan, China
2 School of Life Science, Ningxia University, Yinchuan, China
3 State Key Laboratory of Grassland Agro-Ecosystem, Lanzhou University, Lanzhou, China

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-1] and elevated [EC; 720 μmol(CO2) mol-1] [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.

Keywords: biomass allocation; leaf gas exchange; leaf properties

Received: February 6, 2014; Accepted: November 20, 2014; Published: September 1, 2015Show citation

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Ma, F., Xu, T.T., Ji, M.F., & Zhao, C.M. (2015). Responses of two endemic species of Hippophae at the Qinghai-Tibet Plateau to elevated CO2 concentration. Photosynthetica, 53(3), 395-402. doi: 10.1007/s11099-015-0125-2.
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