生长光强对六个橡胶树品种幼苗光合特性的影响

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

摘要:

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(P_max)、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(V_cmax)和最大电子传递速率(J_max)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(P_max)、暗呼吸速率(Rd)、磷酸丙糖利用速率(TPU)、最大电子传递速率(J_max)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(V_cmax)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。

Abstract:

Six varieties of Hevea brasiliensis seedlings adapted for 1 year were grown under different light intensity, such as 100%, 50%, 25% and 5% nature 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 (P_max), light compensation point (LCP), dark respiration rate (Rd), triose phosphate utilization rate (TPU), maximum carboxylation rate (V_cmax ) and maximum electron transport rate (J_max) 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 (P_max), dark respiration rate (Rd), triose phosphate utilization rate (TPU), the largest electron transfer rate (J_max) and chlorophyll content (Chl) among six varieties had significant difference (P<0.05), and did not light compensation point (LCP), maximum carboxylation rate (V_cmax) 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%.