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Position: Home > Articles > Effects of High Temperature Stress on Photosynthesis in Ficus concinna var. subsessilis Chinese Agricultural Science Bulletin 2009,25 (3) 83-87

高温胁迫对无柄小叶榕光合作用的影响

作者：

金松恒;李雪芹;王俊刚

单位：

浙江林学院天目学院;浙江林学院林业与生物技术学院

关键词：

无柄小叶榕;高温胁迫;光合作用;Rubisco活力

摘要：

以无柄小叶榕为材料,研究了不同时间高温处理对无柄小叶榕气体交换参数、叶绿素荧光参数和Rubisco活力的影响。结果表明,随着高温处理的持续,净光合速率(Pn)持续下降,而气孔导度(Gs)下降非常缓慢,蒸腾速率(Tr)则先开始快速上升随后保持稳定,但是胞间CO2浓度(Ci)却没有明显变化。进一步研究发现,在高温胁迫下,开放PSII反应中心激发能捕获效率(Fv'/Fm')、光化学猝灭(qP)、PSII实际量子产额(ФPSI)I和电子传递速率(ETR)都持续下降。Rubisco初始活力下降速度则快于这些荧光参数的变化。非光化学猝灭(NPQ)则是先迅速上升后来略有下降。这些结果表明高温抑制无柄小叶榕的光合作用不是由于气孔因素引起的,而是由于高温抑制了Rubisco活力,进而影响PSII活力和电子传递。

译名：

Effects of High Temperature Stress on Photosynthesis in Ficus concinna var. subsessilis

作者：

Jin Songheng1, Li Xueqin2, Wang Jungang1 (1School of Forestry andBiotechnology, Zhejiang Forestry University, Lin'an Zhejiang 311300; 2TianmuCollege, Zhejiang Forestry University, Lin'an Zhejiang 311300)

关键词：

Ficus concinna var.subsessilis, high temperature stress, photosynthesis, Rubisco activity

摘要：

We explored the gas exchange, chlorophyll fluorescence properties and Rubisco activity in Ficus concinna var. subsessilis under high temperature stress. The results showed that with continuing of high temperature, the net photosynthetic rate (Pn) in Ficus concinna was decreased, and the stomatal conductance (Gs) was slightly decreased. The transpiration rate (Tr) was increased after the 4 d of treatment, and then maintained stable, while the intercellular CO2 concentration (Ci) was rather stable. Further studies showed that the efficiency of energy conversion of open PSⅡ (Fv'/Fm'), the actual efficiency of total PSII centers (ΦPSII), photochemical quenching (qP), and electron transport rate (ETR) were decreased. The magnitude of the decrease in these parameters was much less than that in the initial Rubisco activity. And the non-photochemical quenching (NPQ) were increased after the 12 d of high temperature stress, and then was slightly decreased. There results suggested that the decreased Pn under high temperature stress was not resulted from the decrease of stomatal conductance, and the primary limitation of Pn was suppression of Rubisco activity, thereby the PSII activity and the electron transport were decreased.

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高温胁迫对无柄小叶榕光合作用的影响

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