Effect of low night temperature treatment and recovery on photosynthesis and the allocation of absorbed light energy in tomato (Lycopersicon esculentum Mill.) leaves
Effect of low night temperature treatment and recovery on photosynthesis and the allocation of absorbed light energy in tomato (Lycopersicon esculentum Mill.) leaves
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DOI：
10.1080/14620316.2011.11512731
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发表时间：
2011-03-01
影响因子：
1.9
通讯作者：
Qi, H. Y.
中科院分区：
文献类型：
--
作者：
Liu, Y. F.;Li, T. L.;Qi, H. Y.
番茄(Lycpers sice esculentum Mill.)将叶片置于夜间低温(LNT；9℃)3、6或9d，然后在15℃下恢复9d，并以夜间温度为15℃的番茄叶片作为对照。研究了光合作用、叶绿素荧光和吸收光能分配的变化。LNT处理3、6或9d后，净光合速率(P(N))受到可逆抑制。光系统II的潜在活性(PSII；F(V)/F(O))明显降低，对LNT处理的敏感性高于PSII的最大量子效率(F(V)/F(M))。PSII反应中心的实际光化学效率(Phi(PSII))的下降归因于光化学猝灭系数(Qp)和开放PSII中心捕获激发能量的效率(F(V)(I)/F(M)(I))的下降。同时，与对照相比，电子传递速率(ETR)降低，PSII触角吸收的光能分配到光化学反应中心(P)减少，热耗散(D)和过剩能量(E)分配增加。LNT在9℃下处理9d，对PSII的影响是可逆的。
Tomato (Lycopersicon esculentum Mill.) leaves were subjected to a low night temperature (LNT; 9 degrees C) for 3,6, or 9 d, followed by recovery for 9 d at 15 degrees C. Tomato leaves subjected to a night temperature of 15 degrees C were used as controls. Changes in photosynthesis, chlorophyll fluorescence, and the allocation of absorbed light energy were studied. LNT treatment for 3,6, or 9 d resulted in the reversible inhibition of the net photosynthetic rate (P(n)). The potential activity of photosystem II (PSII; F(v)/F(o)) was clearly reduced and showed greater sensitivity to LNT treatment than the maximum quantum efficiency of PSII (F(v)/F(m)). The decline in the actual photochemical efficiency of PSII reaction centres (Phi(PSII)) was attributed to a decrease in the photochemical quenching coefficient (qP) and the efficiency of excitation energy capture by open PSII centres (F(v)(I)/F(m)(I)). Meanwhile, the rate of electron transport (ETR) decreased relative to control tomato leaves, and the allocation of light energy absorbed by PSII antennae into the photochemical reaction centres (P) decreased, whereas the allocations to thermal dissipation (D) and excessive energy (E) increased. The effect of LNT treatment at 9 degrees C for up to 9 d on PSII was reversible.