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Title: Diurnal changes in chloroplast positioning and photosynthetic traits of C₄ grass finger millet
Authors: Maai, Eri  kyouindb  KAKEN_id
Nishimura, Kazusa
Takisawa, Rihito
Nakazaki, Tetsuya
Author's alias: 間合, 絵里
西村, 和紗
滝澤, 理仁
中﨑, 鉄也
Keywords: C₄ plant
chloroplast movement
finger millet
light stress
mesophyll cell
Issue Date: 2020
Publisher: Taylor and Francis Ltd.
Journal title: Plant Production Science
Volume: 23
Issue: 4
Start page: 477
End page: 489
Abstract: Mesophyll (M) chloroplasts in finger millet are known to aggregate to the bundle sheath side when leaves are constantly irradiated with extremely high-intensity light. This aggregative movement of M chloroplasts is also observed in natural environment, but whether a natural light regime is effective in inducing the response remains unclear. Abscisic acid is reported to trigger not only the aggregative movement but also stomatal closure, but photosynthetic responses accompanying the aggregative movement also remain unknown.We investigated changes in chloroplast positioning and photosynthetic traits under diurnal patterns of light, mimicking the natural light environment. M chloroplasts showed the aggregative movement with increasing light intensity whether it frequently fluctuated or not, and kept their aggregative positions in the midday. With decreasing light intensity, M chloroplasts returned to the random position in the evening. These results suggest that M chloroplasts often rearrange their intracellular positions during the daytime and that the chloroplast aggregative movement can be induced by a natural regime of light. The chloroplast aggregative movement was observed with increasing stomatal conductance, suggesting that stomatal closure is not crucial to trigger the chloroplast response.
Rights: © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1080/1343943X.2020.1758171
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