论文部分内容阅读
以小麦为实验材料,研究了紫外线B(UV-B)胁迫下冬小麦光合作用对温度变化的响应规律.结果表明:温度由21℃升高至31℃,小麦的光合作用主要参数(净光合速率、气孔导度、光和能力、羧化效率、RuBP羧化酶/加氧酶、光合色素含量等)和生长发育速率逐步升高;当温度升高至36℃时.伴随着净光合速率的降低,气孔导度、光和能力、羧化效率、RuBP羧化酶/加氧酶、光合色素含量和生长发育速率显著降低,光合作用降低既有气孔因素也有非气孔因素.而在21℃至36℃温度范围内.UV-B辐射对小麦光合作用参数均有抑制效应,较低温度和高温下抑制作用加大.研究表明在温带和寒带,气候变暖有利于小麦光合作用,促进生长发育,有利于提高植物抗UV-B能力. “,”To determine the effects of temperature change on the photosynthesis and growth development, wheat seedlings were subjected to UV-B radiation under different temperature and the photosynthesis parameters ( e.g. net photosyntic, stomatal conductance, photosynthesis, carboxylation effeciency, etc. ) and biomass were determined. The results indicated that the photosynthesis parameters and biomass were increased with temperature enhancement, and then all those parameters began to decrease when the temperature was at 36℃. Moreover, UV-B radiation could result in derease in photosynthesis and biomass accumulation, the worse effects were at the lower and higher temperature condition. This result suggested that warming can enhance the crops growth and enhance the crops physiological tolerance to UV-B damage in warm/cold temperate zone.