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

Autor: Ma, F., Xu, T., Ji, M., Zhao, C.
Předmět:
Zdroj: Photosynthetica; Sep2015, Vol. 53 Issue 3, p395-402, 8p
Abstrakt: The responses of photosynthesis and growth to increasing CO concentration ([CO]) 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(CO) mol] and elevated [EC; 720 μmol(CO) mol] [CO] 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 [CO] and it might expand its distribution range in the future. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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