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| 1 | Effects of short-term low temperatures on photosystem Ⅱ function of samara and leaf of Siberian maple (Acer ginnala) and subsequent recovery显示文摘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. | XiangLiang PAN1, DaoYong ZHANG1,2, Xi CHEN1, Li LI1, GuiJin MU1, LanHai LI1, AnMing BAO1, Jing LIU2, HuaiSong ZHU1, WenJuan SONG1, JianYing YANG1, JunYong AI1 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 | 2009 | Journal of Arid Land2009，1，1： | 10 |
| 2 | Random amplified polymorphic DNA and amplified fragment length polymorphism assess- ment of genetic variation in Nicaraguan populations of Pinus oocarpa显示文摘 | DIAZ V MU1 IIZ LM FERRER E | 2001 | Mol Ecol2001，10，11： | 1 |
| 3 | Leiocyclocin A and B, Two Cyclopeptides from Goniothalamus leiocarpus显示文摘Two new cyclopeptides, leiocyclocin A (1), B (2), were isolated from the seeds of Goniothalamus leiocarpus. Their structures were elucidated by means of spectral and chemical methods. | Qing MU1,2*, Rong Wei TENG1, Chao Ming LI1, De Zu WANG1, Yu WU1, Han Dong SUN1, Chang Qi HU2 1Phytochemistry Laboratory, Kunming Institute of Botany, Chinese Acadmy of Sciences, Kunming 650204 2School of Pharmacy, Fudan University, Shanghai 200032 | 2001 | Chinese Chemical Letters2001，12，7： | 1 |
| 4 | A Statistical Examination on the Compensation between the Enthalpies and Entropies Obtained from the Calorimetric Methods显示文摘The validity of the compensation between the enthalpies and entropies obtained from the calorimetric methods was statistically examined for the first time based on computer simulations. It turned out that the several claimed enthalpy-entropy compensations in literature based upon the calorimetric measurements were statistically correct. Interestingly, a linear relationship between the slopes and correlation coefficients of the T(S-(H plots of different supramolecular systems was found, which indicated that the solvent reorganization was the physical origin of the compensation behavior. | Lei LIU1,2, Chao YANG1, Ting Wei MU1, Qing Xiang GUO1* 1 Department of Chemistry, University of Science and Technology of China, Hefei 230026 2 Department of Chemistry, Columbia University, New York, NY 10027 | 2001 | Chinese Chemical Letters2001，12，2： | 0 |
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