不同季节红叶桃、紫叶李的光合特性研究

Study on the Photosynthetic Characteristics of Red-leaf Peach and Purple-leaf Plum in Different Seasons

以绿叶桃和绿叶李品种为对照,研究了田间条件下不同季节红叶桃、紫叶李的光合特性。结果表明:(1)红叶桃、紫叶李的净光合速率(Pn)在春、夏季低于绿叶品种,而秋季较为接近,彩叶品种与绿叶品种间的差异随季节进程不断减小;(2)红叶桃、紫叶李的表观量子效率(AQY)和羧化效率(CE)在春、夏季均显著低于对应的绿叶品种,秋季时红叶桃和紫叶李的表观量子效率高于绿叶品种,羧化效率与绿叶品种接近;(3)红叶桃、紫叶李的光补偿点(LCP)在春季和夏季显著高于绿叶品种,秋季时则显著低于绿叶品种,光饱和点(LSP)始终高于或接近于绿叶品种;(4)红叶桃、紫叶李的光合色素含量与绿叶品种差异较小,但其花色素苷含量始终比绿叶品种高许多;(5)红叶桃、紫叶李光呼吸(Rp)均低于绿叶桃和绿叶李。

The photosynthetic characteristics of red-leaf peach and purple-leaf plum were studied with the green-leaf peach and green-leaf plum varieties as control in field in different seasons. The result showed that： （ 1 ） The Pn of red-leaf peach and purple-leaf plum was significantly lower than that of green-leaf peach and green-leaf plum in spring and summer without significant difference in autumn, and the difference between two species was gradually reduced from spring to autumn; （2） Apparent quantum yield （AQY） and carboxylation efficiency （CE） of red-leaf peach and purple-leaf plum were significantly lower than that of green-leaf peach and green-leaf plum in spring and summer. The AQY of red-leaf peach and purple-leaf plum was higher than that of green-leaf cuhivars, and CE was similar between two species in autumn. ; （3） Light compensation point （LCP） of red-leaf peach and purple-leaf plum was significantly higher than that of green-leaf cultivars in spring and summer, but significantly lower than that in autumn. Light saturation point （LSP） of redleaf peach and purple-leaf plum were always higher than that of green-leaf cultivars or similar to them; （4） The content of photosynthetic pigment was not significantly different between the red-leaf peach and green-leaf peach, but the content of anthocyanin of the red-leaf peach and the purple-leaf plum was always higher than that in green-leaf cultivars ; （5） Photo respiration （Rp） of red-leaf peach and purple-leaf plum was significandy lower than opposite green-leaf cultivars as control.