论文部分内容阅读
为了研究不同温度和光强处理后杨梅叶片的气体交换和叶绿素荧光参数变化,以探明在高温强光条件下杨梅叶片光合作用的变化特性,以两年生‘东魁’和‘大炭梅’杨梅盆栽苗为试材,测定不同光温交互处理后叶片气体交换和叶绿素荧光参数。结果表明,与25℃+500μmol·m-2·s-1处理相比,40℃+1500μmol·m-2·s-1下‘东魁’和‘大炭梅’叶片净光合速率(Pn)分别下降69.1%和102.6%、表观量子效率(AQY)及最大光化学效率(Fv/Fm)均明显下降,而初始荧光(F0)则分别上升23.3%和30.4%。随着温度的升高,3种光强(500、1000和1500μmol·m-2·s-1)下的气孔导度(Gs)均呈下降趋势,且下降幅度不断增加,而叶片蒸腾速率(Tr)基本呈线性上升趋势。可见,在25℃下,强光诱导杨梅叶片产生光抑制程度较低,高温强光复合胁迫加剧杨梅叶片的光抑制程度,但‘东魁’叶片光抑制程度比‘大炭梅’低,说明‘东魁’比‘大炭梅’更耐高温强光胁迫。
In order to study the changes of gas exchange and chlorophyll fluorescence parameters of Myrica rubra leaves under different temperature and light intensity, in order to find out the characteristics of photosynthesis of Myrica rubra under high temperature and high light conditions, The arborvitae potted seedlings were used as test materials to measure the leaf gas exchange and chlorophyll fluorescence parameters after different light and temperature interaction treatments. The results showed that the net photosynthetic rate (Pn) of ’Dongkui’ and ’Da-bangmei’ leaves under 40 ℃ and 1500μmol · m-2 · s-1 were significantly higher than those under 25 ℃ and 500μmol · m-2 · s- (AQY) and maximum photochemical efficiency (Fv / Fm) decreased by 69.1% and 102.6%, respectively, while the initial fluorescence (F0) increased by 23.3% and 30.4% respectively. With the increase of temperature, the stomatal conductance (Gs) of three kinds of light intensity (500,1000 and 1,500 μmol · m-2 · s-1) showed a decreasing trend, and the decreasing extent increased, while the leaf transpiration rate Tr) is basically a linear upward trend. It can be seen that at 25 ℃, there was a lower degree of photoperiod suppression in leaves of Myrica rubra under high light stress, and the photoinhibition was more aggravated in leaves of Bayberry leaf under high temperature and high light stress, but the photoperiod inhibition of ’Dongkui’ leaves was lower than that of ’Da-cai-mei’ ’East Quebec’ more than ’Big Carbon plum’ more high temperature and light stress.