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- Title
The avoidance and aggregative movements of mesophyll chloroplasts in C4 monocots in response to blue light and abscisic acid.
- Authors
Maai, Eri; Shimada, Shouu; Yamada, Masahiro; Sugiyama, Tatsuo; Miyake, Hiroshi; Taniguchi, Mitsutaka
- Abstract
In C4 plants, mesophyll (M) chloroplasts are randomly distributed along the cell walls, whereas bundle sheath chloroplasts are located in either a centripetal or centrifugal position. It was reported previously that only M chloroplasts aggregatively redistribute to the bundle sheath side in response to extremely strong light or environmental stresses. The aggregative movement of M chloroplasts is also induced in a light-dependent fashion upon incubation with abscisic acid (ABA). The involvement of reactive oxygen species (ROS) and red/blue light in the aggregative movement of M chloroplasts are examined here in two distinct subtypes of C4 plants, finger millet and maize. Exogenously applied hydrogen peroxide or ROS scavengers could not change the response patterns of M chloroplast movement to light and ABA. Blue light irradiation essentially induced the rearrangement of M chloroplasts along the sides of anticlinal walls, parallel to the direction of the incident light, which is analogous to the avoidance movement of C3 chloroplasts. In the presence of ABA, most of the M chloroplasts showed the aggregative movement in response to blue light but not red light. Together these results suggest that ROS are not involved in signal transduction for the aggregative movement, and ABA can shift the blue light-induced avoidance movement of C4-M chloroplasts to the aggregative movement.
- Subjects
MESOPHYLL tissue; CHLOROPLASTS; ABSCISIC acid; RAGI; REACTIVE oxygen species
- Publication
Journal of Experimental Botany, 2011, Vol 62, Issue 9, p3213
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/err008