光质对姜生长及光能利用特性的影响

 以彩色电光源创造不同光质环境，研究了光质对姜生长、叶片光合作用及叶绿素荧光参数的影响。结果表明：室内人工光源条件下，姜苗生长量、叶绿素含量及叶片光合速率（Pn）以白光和红光处理较高，蓝光居中，绿光较低。室内不同光质处理的姜苗移至室外自然光照条件下测定叶片Pn和光呼吸速率（Pr），其中白光处理较高，蓝光、红光和绿光处理依次降低，而Pr/Pn则相反；叶片Fv/Fm、Fv′/Fm′及qP在午间强光下显著降低，其值以白光处理较高，蓝光、红光和绿光处理依次降低，PSⅠ和PSⅡ之间激发能分配不平衡偏离系数（β/α-1）则刚好相反；叶片用于光化学反应的激发能（P）以白光处理较高，绿光处理较低，蓝光、红光处理居中，而天线热耗散能量（D）和反应中心过剩能量（Ex）则以绿光处理较高，白光处理较低。

Effects of Light Quality on Growth and Light Utilization Characteristics in Ginger

Effects of light quality on the growth, photosynthesis and chlorophyll fluorescence of ginger were investigated in this study. The results indicated that white or red light induced the greatest growth, chlorophyll content and net photosynthetic rate (Pn), followed by blue and green light in order from high to low level. When ginger seedlings were transferred to sunlight, the Pn and photorespiration (Pr) of leaves treated with white light were the highest, followed by blue, red or green light in turn, while that of Pr/Pn was reverse. The maximal photochemical efficiency (Fv/Fm) and efficiency of excitation energy capture by open PSⅡ reaction centres (Fv′/Fm′) as well as photochemical quenching coefficient (qP) decreased markedly under middy strong light. But their values in different treatments were different, with the highest values in white light treatment, followed by blue, red or green light in order from high to low level. Contrarily, white, blue, red or green light treatment induced the relative deviation from full balance between two photosystems (β/α-1) in ginger leaves increased in turn. In parallel, the excitation energy used in photochemical reaction (P) of leaves treated with white light was the highest, the next was blue or red light, and the lowest was green light. While the antenna heat dissipation (D) and excess light energy (E) of PSⅡ in ginger leaves treated with green light was the highest and white light was the lowest.