Chloroplasts move towards the nearest anticlinal walls under dark condition |
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Authors: | Hidenori?Tsuboi Email author" target="_blank">Masamitsu?WadaEmail author |
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Institution: | (1) Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan; |
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Abstract: | Chloroplasts change their intracellular positions in response to their light environment. Under darkness, chloroplasts assume
special positions that are different from those under light conditions. Here, we analyzed chloroplast dark positioning using
Adiantum capillus-veneris gametophyte cells. When chloroplasts were transferred into darkness, during the first 1–5 h, they moved towards the anticlinal
cell walls bordering the adjacent cells rather rapidly. Then, they slowed down and accumulated at the anticlinal walls gradually
over the following 24–36 h. The chloroplast movements could be roughly classified into two different categories: initial rapid
straight movement and later, slow staggering movement. When the chloroplast accumulation response was induced in dark-adapted
cells by partial cell irradiation with a microbeam targeted to the center of the cells, chloroplasts moved towards the beam
spot from the anticlinal walls. However, when the microbeam was switched off, they moved to the nearest anticlinal walls and
not to their original positions if they were not the closest, indicating that they know the direction of the nearest anticlinal
wall and do not have particular areas that they migrate to during dark positioning. |
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Keywords: | |
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