生长光强对六个橡胶树品种幼苗光合特性的影响

研究了6个橡胶树品种幼苗(适应1年后)在不同生长光强(100%、50%、25%和5%自然光)下的叶片光合系统对光强和CO2浓度的响应特性。结果表明,6个橡胶树品种对不同的光环境均表现出较强的适应性。在不同生长光强下,橡胶树幼苗叶片的最大光合速率(Pmax)、光补偿点(LCP)、暗呼吸速率(Rd)、磷酸丙糖利用速率(TPU)、最大羧化速率(Vcmax)和最大电子传递速率(Jmax)以及叶绿素含量(Chl)均有显著差异(P<0.05),而光饱和点(LSP)和AQY(表观量子效率)则无显著差异。相同生长光强下,6个橡胶树品种间叶片的最大光合速率(Pmax)、暗呼吸速率(Rd)、磷酸丙糖利用速率(TPU)、最大电子传递速率(Jmax)和叶绿素含量(Chl)有显著差异(P<0.05),其光补偿点(LCP)、最大羧化速率(Vcmax)和表观量子效率(AQY)则无显著差异。综合比较各参数,RRIM600、云研77-4和PR107适宜于相对光强为100%~50%的植胶环境,而云研77-2、GT1和热研523适宜于相对光强为50%~25%的植胶环境。

Influence of Growth Light Intensity on Photosynthetic Characteristics in Six Varieties of Hevea brasiliensis Seedlings

Abstract: Six Hevea brasiliensis varieties seedlings adapted for 1 year were grown under different light intensity, such as 100%, 50%, 25% and 5% natural light, the response characteristics of leaf photosynthetic system to light intensity and CO2 concentration were studied. The results showed that six H. brasiliensis varieties showed strong adaptability to different light environments. Under different light intensities, the maximum photosynthetic rate (Pmax), light compensation point (LCP), dark respiration rate (Rd), triose phosphate utilization rate (TPU), maximum carboxylation rate (Vcmax ) and maximum electron transport rate (Jmax) and chlorophyll content (Chl) showed significant differences (P<0.05), and did not light saturation point (LSP) and AQY (apparent quantum efficiency). Under the same light intensity, leaf maximum photosynthetic rate (Pmax), dark respiration rate (Rd), triose phosphate utilization rate (TPU), the largest electron transfer rate (Jmax) and chlorophyll content (Chl) among six varieties had significant difference (P<0.05), and did not light compensation point (LCP), maximum carboxylation rate (Vcmax) and apparent quantum efficiency (AQY). Comprehensive comparison of parameters in six H. brasiliensis varieties, RRIM600, Yunyan77-4 and PR107 are fit for planting environment with relative light intensity of 100%-50%, while Yunyan77-2, GT1 and Reyan523 are suitable for that of 50%-25%.