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用开顶式气室(Open top chamber,OTC)进行气温升高1℃和气温升高1℃+大气CO2浓度升高200μmol/mol条件下野生大豆叶片光合生理和叶绿素荧光参数的变化研究。结果表明,气温升高使大豆净光合速率、气孔导度和蒸腾速率均下降,水分利用效率提高,PS II的最大量子产量(Fv/Fm)下降,PS II的实际量子产量(ΦPSⅡ)和PS II的电子传递速率(ETR)升高,光化学猝灭系数(q P)升高,非光化学猝灭系数(NPQ)下降;CO2浓度升高能逆转由于升温造成的净光合速率下降,增加叶片水分利用效率,但光合速率仍较对照下降,还会使野生大豆叶片光化学猝灭系数(q P)和非光化学猝灭系数(NPQ)下降。未来气温和大气CO2浓度升高条件下,野生大豆更容易受到高温或干旱胁迫,造成气孔导度下降,净光合速率下降。表明未来的气候变化将不利于野生大豆的生长发育。
The changes of photosynthetic and chlorophyll fluorescence parameters in leaves of wild soybean were studied with open top chamber (OTC) at 1 ℃ and 1 ℃ + atmospheric CO2 concentration 200μmol / mol. The results showed that the net photosynthetic rate, stomatal conductance and transpiration rate decreased, water use efficiency increased, the maximum quantum yield of PS II (Fv / Fm) decreased, the actual quantum yield of PS II (ΦPSⅡ) and PS II increased, the photochemical quenching coefficient (q P) increased and the non-photochemical quenching coefficient (NPQ) decreased. The increase of CO2 concentration could reverse the decrease of net photosynthetic rate (Pn) and the increase of water use efficiency But the photosynthetic rate was still lower than that of the control, but also the photochemical quenching (q P) and non-photochemical quenching (NPQ) of wild soybean decreased. Under the condition of the future temperature and atmospheric CO2 concentration increasing, the wild soybean is more likely to be under the high temperature or drought stress, resulting in the decrease of stomatal conductance and the decrease of net photosynthetic rate. Suggesting that future climate change will not be conducive to the growth and development of wild soybean.