Low N level increases the susceptibility of <scp>PSI</scp> to photoinhibition induced by short repetitive flashes in leaves of different rice varieties
Low N level increases the susceptibility of <scp>PSI</scp> to photoinhibition induced by short repetitive flashes in leaves of different rice varieties
复制标题
低氮水平增加<scp>PSI</scp>对不同水稻品种叶片短时间重复闪光引起的光抑制的敏感性
DOI：
10.1111/ppl.13644
复制
发表时间：
2022
影响因子：
6.4
通讯作者：
Noguchi Ko
中科院分区：
文献类型：
--
作者：
Ozaki Hiroshi;Takagi Daisuke;Mizokami Yusuke;Tokida Takeshi;Nakamura Hirofumi;Sakai Hidemitsu;Hasegawa Toshihiro;Noguchi Ko
从光抑制的恢复是慢得多的光系统（PS）I比PSII，因此，PSI对光抑制的敏感性是重要的光合生产在特殊的生理条件下。先前的研究表明，重复短脉冲（rSP）照明选择性地诱导PSI光抑制。根据生长光强度或植物的品种/物种，PSI光抑制是不同的，但其潜在的机制仍然未知。在这里，我们的目的是澄清是否PSI光抑制的敏感性的差异取决于环境因素或水稻品种和植物的生理特性与这种敏感性。我们将水稻植株的成熟叶片暴露于rSP光照。研究了生长过程中CO2浓度升高和低N对PSI光抑制敏感性的影响，并比较了12个不同品种的PSI光抑制敏感性。我们拟合了PSI的量子产率在rSP照明过程中的下降，并估计了一个参数，表明敏感性。低N水平增加了敏感性，而高CO2浓度没有。不同水稻品种的感病性不同，多数品种的感病性高于温带粳稻品种。感病性与叶绿素含量和氮含量呈负相关。然而，下降的值，一个指标，受损PSI，与叶绿素含量呈正相关。这表明，在具有较大的电子传递能力的叶片，整体PSI活动可能是不太容易受到光抑制，但更多的损坏PSI可能会积累在rSP照明。
The recovery from photoinhibition is much slower in photosystem (PS) I than in PSII; therefore, the susceptibility of PSI to photoinhibition is important with respect to photosynthetic production under special physiological conditions. Previous studies have shown that repetitive short‐pulse (rSP) illumination selectively induces PSI photoinhibition. Depending on the growth light intensity or the variety/species of the plant, PSI photoinhibition is different, but the underlying mechanisms remain unknown. Here, we aimed to clarify whether the differences in the susceptibility of PSI to photoinhibition depend on environmental factors or on rice varieties and which physiological properties of the plant are related to this susceptibility. We exposed mature leaves of rice plants to rSP illumination. We examined the effects of elevated CO2concentration and low N during growth on the susceptibility of PSI to photoinhibition and compared it in 12 different varieties. We fitted the decrease in the quantum yield of PSI during rSP illumination and estimated a parameter indicating susceptibility. Low N level increased susceptibility, whereas elevated CO2concentration did not. The susceptibility differed among different rice varieties, and manyindicavarieties showed higher susceptibility than thetemperate japonicavarieties. Susceptibility was negatively correlated with the total chlorophyll content and N content. However, the decrease invalue, an indicator of damaged PSI, was positively correlated with chlorophyll content. This suggests that in leaves with a larger electron transport capacity, the overall PSI activity may be less susceptible to photoinhibition, but more damaged PSI may accumulate during rSP illumination.