短期生长环境光强骤增导致典型阴生植物三七光系统受损的机制

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武洪敏¹^,², 双升普¹^,², 张金燕¹^,², 寸竹¹^,², 孟珍贵¹^,², 李龙根¹^,², 沙本才¹, 陈军文¹^,²^,^*(

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Photodamage to photosystem in a typically shade-tolerant species Panax notoginseng exposed to a sudden increase in light intensity

WU Hong-Min¹^,², SHUANG Sheng-Pu¹^,², ZHANG Jin-Yan¹^,², CUN Zhu¹^,², MENG Zhen-Gui¹^,², LI Long-Gen¹^,², SHA Ben-Cai¹, CHEN Jun-Wen¹^,²^,^*(

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图10. 遮阴与全日光叶片对电子传递和光系统能量分配的影响(平均值±标准误,n = 7)。LL, 低光强(230 μmol·m ^-2·s^-1, 13:00), HL, 高光强(2 300 μmol·m ^-2·s^-1, 13:00)。Y(I), PSI光化学量子产量; Y(ND), PSI供体侧限制引起的热耗散量子产量; Y(NA), PSI受体侧限制引起的非光化学量子产量; Y(II), PSII光化学量子产量;Y(NPQ), PSII参与热耗散的量子产量; Y(NO), PSII参与调节性能量耗散的量子产量。ETR(I), 通过PSI的电子传递速率;ETR(II), 通过PSII的电子传递速率; CEF,PSI周围的环式电子流。*, 同一测量日的两处理间差异显著(p< 0.05)。

Fig. 10. Effect of shade and full sunlight treatment on electron transfer and photosystem energy partitioning (mean ± SE, n = 7). LL, 10% transmittance-grown Panax notoginseng (230 μmol·m ^-2·s^-1, 13:00); HL, full sunlight-grown Panax notoginseng (2 300 μmol·m ^-2·s^-1, 13:00). Y(I), effective quantum yield of PSI; Y(ND), heat dissipation efficiency at the donors quantum yield of PSI; Y(NA), quantum yield of PSI non-photochemical energy dissipation due to acceptor; Y(II), effective quantum yield of PSII; Y(NPQ), quantum yield of energy dissipation in PSII; Y(NO), fraction of energy passively dissipated in forms of heat and fluorescence. ETR(I), electron transport rate of PSI; ETR(II), electron transport rate of PSII;CEF, cyclic electron flow around PSI. *, significant difference between the two treatments at same measurement day ( p< 0.05).