Abstract: In order to explore the photosynthetic and physiological characteristics of Camellia perpetua under different light intensities, two-year-old C. perpetua cuttings were used as the research object, and four light intensities, including 10% light, 20% light, 40% light and full light, were set. The photosynthetic and physiological indexes were measured after 45 days of plant adaptation. The results showed that the photosynthetic rate (Pn) and stomatal conductance (Gs) were the highest in 10% light treatment, there was no significant difference between 20% light and 40% light treatment, but significantly higher than that in full light treatment. The intercellular CO2 concentration (Ci) and transpiration rate (Tr) of full light treatment were significantly higher than those of the other three treatments. There was no significant difference between 20% light treatment and 10% light treatment in Ci, but significantly lower than 40% light treatment. There was no significant difference between 20% light and 40% light, but significantly higher than 10% light in Tr. Contents of chlorophyll a, chlorophyll b and the total amount of chlorophyll were the highest under 40% light, which was significantly higher than those of other treatments. The protein content and peroxidase (POD) activity were the highest under 10% light. There was significant difference among the treatments in protein content, and the POD activity under full light was significantly lower than those of other treatments. Soluble sugar content, superoxide dismutase (SOD) activity and malondialdehyde (MDA) content were the highest in full light and the lowest in 10% light. C. perpetua was more suitable for growing in shady and low light environment, which was conducive to photosynthesis, growth and development of plants. High intensity light environment would inhibit the photosynthetic physiology of C. perpetua in varying degrees.

Key words: Camellia perpetua, light intensity, photosynthesis, physiological characteristics

摘要： 采用四季金花茶(Camellia perpetua) 2年生扦插苗为试材，设置10%光照、20%光照、40%光照和全光照等4个光照强度处理，植株适应45 d后测定其叶片光合指标和生理指标。结果表明，10%光照处理的叶片光合速率和气孔导度最高，20%光照和40%光照之间无显著差异，但均显著高于全光照处理；全光照处理的胞间CO2浓度和蒸腾速率显著高于其他三个处理，20%光照和10%光照处理的胞间CO2浓度差异不明显，但均显著低于40%光照处理，20%光照和40%光照处理的蒸腾速率差异不明显，但均显著高于10%光照处理。叶绿素a、叶绿素b和总叶绿素含量以40%光照处理的为最高，显著高于其他处理；10%光照处理的植株叶片蛋白质含量和过氧化物酶(POD)活性最高，各处理间蛋白质含量差异显著，全光照处理的POD活性显著低于其他处理；可溶性糖含量、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量以全光照处理为最高，而10%光照处理的最低。遮阴的低光照环境更适合于四季金花茶生长，有利于植株进行光合作用，而高强度光照环境对四季金花茶光合生理产生不同程度的抑制作用。

关键词: 四季金花茶, 光照强度, 光合作用, 生理特性