Abstract
In C4 plants, mesophyll (M) chloroplasts are randomly distributed in the cells, but bundle sheath (BS) chloroplasts are located in a centripetal or centrifugal position. In the last conference, we reported that only M chloroplasts showed accumulation movements to the BS side in response to extremely high light (3,000-4,000 μmol m-2 s-1) or environmental stresses such as drought and salinity (light intensity: 250-500 μmol m-2 s-1). In this study, we report that M chloroplast movement of finger millet (Eleusine coracana) in response to environmental stresses was induced by light irradiation but did not need direct irradiation. Additionally, M chloroplast movement was also observed in plants growing in the field in the daytime full-summer but not before dawn. We conclude that M chloroplast movement in response to environmental stresses is occurred in a light-dependent manner and will discuss its physiological mechanism.
