Effects of short-term low temperatures on photosystem II function of samara and leaf of Siberian maple (Acer ginnala) and subsequent recovery
XiangLiang PAN, DaoYong ZHANG, Xi CHEN, Li LI, GuiJin MU, LanHai LI, AnMing BAO, Jing LIU, HuaiSong ZHU, WenJuan SONG, JianYing YANG, JunYong AI
1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550000, China
Effects of short-term low temperatures on photosystem II function of samara and leaf of Siberian maple (Acer ginnala) and subsequent recovery
XiangLiang PAN, DaoYong ZHANG, Xi CHEN, Li LI, GuiJin MU, LanHai LI, AnMing BAO, Jing LIU, HuaiSong ZHU, WenJuan SONG, JianYing YANG, JunYong AI
1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550000, China
摘要 Samara is the reproductive organ (seed) for many tree species in arid land in northwestern China. It is ecologically important in population development due to its dispersal function. However, information on its photosynthesis and effect of environmental stresses on its photosynthesis is still very limited. In the present study, responses of photosystem II (PSII) activity in samara and leaf of Siberian maple to short-term chilling/freezing and subsequent recovery potential were comparatively investigated by using polyphasic fluorescence test. The samara had more efficient photosynthesis (Fv/Fm and PIABS) and more efficient electron transport (φEo) but lower energy dissipation (DIo/RC) than leaf. Generally, the PSII performance and the electron transport for both samara and leaf were inhibited under low temperature stress, accompanied by an increase of energy dissipation in PSII reaction centers (RCs). PSII of both samara and leaf was not markedly affected by chilling and could acclimate to chilling stress. Short-term freezing could completely inhibit PSII activity in both samara and leaf, indicated by the drop of values of Fv/Fm, PIABS, φEo to zero. PSII functional parameters of short-term dark frozen samara could be largely recovered whereas those of frozen leaf could not be recovered. The higher tolerance of samara to short-term low temperature stress than leaf is of great ecological significance for seed development, population establishment of Siberian maple.
Abstract: Samara is the reproductive organ (seed) for many tree species in arid land in northwestern China. It is ecologically important in population development due to its dispersal function. However, information on its photosynthesis and effect of environmental stresses on its photosynthesis is still very limited. In the present study, responses of photosystem II (PSII) activity in samara and leaf of Siberian maple to short-term chilling/freezing and subsequent recovery potential were comparatively investigated by using polyphasic fluorescence test. The samara had more efficient photosynthesis (Fv/Fm and PIABS) and more efficient electron transport (φEo) but lower energy dissipation (DIo/RC) than leaf. Generally, the PSII performance and the electron transport for both samara and leaf were inhibited under low temperature stress, accompanied by an increase of energy dissipation in PSII reaction centers (RCs). PSII of both samara and leaf was not markedly affected by chilling and could acclimate to chilling stress. Short-term freezing could completely inhibit PSII activity in both samara and leaf, indicated by the drop of values of Fv/Fm, PIABS, φEo to zero. PSII functional parameters of short-term dark frozen samara could be largely recovered whereas those of frozen leaf could not be recovered. The higher tolerance of samara to short-term low temperature stress than leaf is of great ecological significance for seed development, population establishment of Siberian maple.
基金资助: Knowledge Innovation Program of Chinese Academy of Sciences (kzcx2-yw-335); Program of 100 Distinguished Young Scientists of the Chinese Academy of Sciences; National Natural Science Foundation of China (40673070, 40872169)
通讯作者:
DaoYong ZHANG
E-mail: zhang-daoyong@163.com
引用本文:
XiangLiang PAN, DaoYong ZHANG, Xi CHEN, Li LI, GuiJin MU, LanHai LI, AnMing BAO, Jing LIU, HuaiSong ZHU, WenJuan SONG, JianYing YANG, JunYong AI. Effects of short-term low temperatures on photosystem II function of samara and leaf of Siberian maple (Acer ginnala) and subsequent recovery[J]. 干旱区科学, 10.3724/SP.J.1227.00057.
XiangLiang PAN, DaoYong ZHANG, Xi CHEN, Li LI, GuiJin MU, LanHai LI, AnMing BAO, Jing LIU, HuaiSong ZHU, WenJuan SONG, JianYing YANG, JunYong AI. Effects of short-term low temperatures on photosystem II function of samara and leaf of Siberian maple (Acer ginnala) and subsequent recovery. Journal of Arid Land, 2009, 1(1): 57-63.
