CO_2浓度和温度对甘肃风毛菊生理特性的协同影响

Interactive effects of CO_2 concentration and temperature on physiological parameters of Saussurea kansuensis

该研究以分布在青藏高原东缘的特有种菊科风毛菊属植物甘肃风毛菊为材料,利用CO_2人工气候箱模拟CO_2浓度升高和温度变化,分析其对甘肃风毛菊各项生理指标的影响。结果表明:CO_2浓度和温度升高对甘肃风毛菊的生理指标影响显著,存在显著的交互作用。在CO_2浓度为550μmol·mol^(-1)时,甘肃风毛菊叶片叶绿素总量、可溶性糖和可溶性蛋白含量达到最大值,而丙二醛(MDA)和超氧阴离子自由基含量均为最小值;在较高温度下,甘肃风毛菊叶片叶绿素总量、可溶性糖和可溶性蛋白含量均增加;丙二醛(MDA)和超氧阴离子自由基含量均降低。当CO_2浓度为550μmol·mol^(-1)时,升高温度能显著提高甘肃风毛菊叶片的叶绿素总量、可溶性糖和可溶性蛋白含量,并且显著减少丙二醛(MDA)和超氧阴离子自由基含量。该研究表明CO_2浓度和温度的升高对甘肃风毛菊的生长具有一定的促进作用。

Saussurea kansuensis,as a kind of the genus Saussurea of Asteraceae,is an endemic species in the eastern of Qinghai-Tibet Plateau. Our objective was to study the effects of elevated CO2 concentration and increasing temperature on physiological parameters of S. kansuensis by using CO2 artificial climate box（ PRX-250C-CO2,Shang Hai）. The results showed that elevated CO2 concentration and increasing temperature had significant interactive effects on physiological parameters of S. kansuensis. The chlorophyll,soluble sugar and soluble protein contents of S. kansuensis reached the maximum,while the minimum content of MDA and superoxide anion was observed when the CO2 concentration was 550 μmol·mol-1. The chlorophyll,soluble sugar and soluble protein contents increased under higher temperature,while the contents MDA and superoxide anion decreased. At CO2 concentration of 550 μmol·mol-1,elevated temperature could significantly enhance the amount of chlorophyll,soluble sugar and soluble protein,and reduce MDA and superoxide anion free radical contents. The results indicated that the increasing CO2 concentration and temperature could promote the growth of S. kansuensis to a certain degree.