Chloroplast Accumulation Response Enhances Leaf Photosynthesis and Plant Biomass Production
Chloroplast Accumulation Response Enhances Leaf Photosynthesis and Plant Biomass Production
复制标题
DOI：
10.1104/pp.18.00484
复制
发表时间：
2018-11-01
期刊：
影响因子：
7.4
通讯作者：
Wada, Masamitsu
中科院分区：
文献类型：
--
作者：
Gotoh, Eiji;Suetsugu, Noriyuki;Wada, Masamitsu
在高光强下，叶绿体通过移动到背斜细胞壁来避免吸收过量的光(回避反应)，而在低光强下，叶绿体沿斜向细胞壁积累(积累反应)。在大多数植物中，这些反应是由蓝光诱导的，并由蓝光光感受器Phototroin介导，Phototroin也调节向光性、叶片扁平和气孔开放。这些由光敏素介导的反应可以促进光合作用和生物量的产生。在这里，我们利用叶绿体运动缺乏的各种拟南芥突变体，我们证明了积累反应增强了叶片的光合作用和植物的生物量生产。值得注意的是，在回避反应中特异缺陷而在其他光敏反应中没有缺陷的突变体植株表现出与光强无关的结构性积累反应，叶片光合作用增强，植物生物量增加。因此，我们的发现为叶绿体积累反应在叶片光合作用和生物量生产中的重要性提供了明确的实验证据。
Under high light intensity, chloroplasts avoid absorbing excess light by moving to anticlinal cell walls (avoidance response), but under low light intensity, chloroplasts accumulate along periclinal cell walls (accumulation response). In most plant species, these responses are induced by blue light and are mediated by the blue light photoreceptor, phototropin, which also regulates phototropism, leaf flattening, and stomatal opening. These phototropin-mediated responses could enhance photosynthesis and biomass production. Here, using various Arabidopsis (Arabidopsis thaliana) mutants deficient in chloroplast movement, we demonstrated that the accumulation response enhances leaf photosynthesis and plant biomass production. Conspicuously, phototropin2 mutant plants specifically defective in the avoidance response but not in other phototropin-mediated responses displayed a constitutive accumulation response irrespective of light intensities, enhanced leaf photosynthesis, and increased plant biomass production. Therefore, our findings provide clear experimental evidence of the importance of the chloroplast accumulation response in leaf photosynthesis and biomass production.