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首页> 外文期刊>Journal of Experimental Botany >Arabidopsis thaliana leaves with altered chloroplast numbers and chloroplast movement exhibit impaired adjustments to both low and high light
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Arabidopsis thaliana leaves with altered chloroplast numbers and chloroplast movement exhibit impaired adjustments to both low and high light

机译：叶绿体数量和叶绿体运动发生变化的拟南芥叶片对弱光和强光的调节均受损

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摘要

The effects of chloroplast number and size on the capacity for blue light-dependent chloroplast movement, the ability to increase light absorption under low light, and the susceptibility to photoinhibition were investigated in Arabidopsis thaliana. Leaves of wild-type and chloroplast number mutants with mean chloroplast numbers ranging from 120 to two per mesophyll cell were analysed. Chloroplast movement was monitored as changes in light transmission through the leaves. Light transmission was used as an indicator of the ability of leaves to optimize light absorption. The ability of leaves to deal with 3 h of high light stress at 10 °C and their capacity to recover in low light was determined by measuring photochemical efficiencies of PSII using chlorophyll a fluorescence. Chloroplast movement was comparable in leaves ranging in chloroplast numbers from 120 to 30 per mesophyll cell: the final light transmission levels after exposure to 0.1 (accumulation response) and 100 μmol photons m−2 s−1 (avoidance response) were indistinguishable, the chloroplasts responded quickly to small increases in light intensity and the kinetics of movement were similar. However, when chloroplast numbers per mesophyll cell decreased to 18 or below, the accumulation response was significantly reduced. The avoidance response was only impaired in mutants with nine or fewer chloroplasts, both in terms of final transmission levels and the speed of movement. Only mutants lacking both blue light receptors (phot1/phot2) or those with drastically reduced chloroplast numbers and severely impacted avoidance responses showed a reduced ability to recover from high light stress.
机译：在拟南芥中研究了叶绿体数量和大小对蓝光依赖性叶绿体运动能力，在弱光下增加光吸收的能力以及对光抑制的敏感性的影响。分析了野生型和叶绿体数量突变体的叶片，每个叶肉细胞的叶绿体平均数量为120至2。叶绿体的运动被监测为通过叶片的光透射的变化。透光率被用作叶片优化光吸收能力的指标。通过使用叶绿素a荧光测量PSII的光化学效率来确定叶片在10°C下应对3 h高光胁迫的能力和在弱光下的恢复能力。每个叶肉细胞的叶绿体运动在叶绿体数量从120到30不等的叶片中相当：暴露于0.1（积累响应）和100μmol光子m -2 s -后的最终透光率1 （回避反应）是无法区分的，叶绿体对光强度的微小增加反应迅速，并且运动动力学相似。但是，当每个叶肉细胞的叶绿体数量减少到18或以下时，积累反应会明显降低。就最终传递水平和运动速度而言，回避反应仅在叶绿体少于或等于9个的突变体中受损。只有既缺乏蓝光受体（phot1 / phot2）又缺乏叶绿体数量大幅减少且回避反应受到严重影响的突变体，其从高光胁迫下恢复的能力却降低了。

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