Chloroplast Accumulation Response Enhances Leaf Photosynthesis and Plant Biomass Production. Issue 3 (28th September 2018)

• Record Type: Journal Article
• Authors: Gotoh, Eiji; Suetsugu, Noriyuki; Yamori, Wataru; Ishishita, Kazuhiro; Kiyabu, Ryota; Fukuda, Masako; Higa, Takeshi; Shirouchi, Bungo; Wada, Masamitsu
• Is Part Of: Plant physiology. Volume 178:Issue 3(2018)
• Page Start: 1358
• Page End: 1369
• Publication Date: 2018-09-28
• Subjects: Plant physiology -- Periodicals; Botany -- Periodicals; Periodicals; Electronic journals; 571.2
• DOI: 10.1104/pp.18.00484
• Languages: English
• ISSNs: 0032-0889

Abstract

Abstract : Chloroplast accumulation response facilitates efficient light capture in leaves and is required for the enhancement of leaf photosynthesis and plant biomass production. Abstract: 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.