phot1 and phot2 mediate blue light-induced transient increases in cytosolic Ca 2+ differently in Arabidopsis leaves
Phototropins (phot1 and phot2) are blue light (BL) receptors that mediate phototropism, chloroplast movements, and stomatal opening in Arabidopsis thaliana . Physiological studies have suggested that Ca 2+ in the cytoplasm plays a pivotal role in these BL-induced responses. A phot1-mediated increase...
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| Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 100; no. 14; pp. 8583 - 8588 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
08.07.2003
|
| Online Access | Get full text |
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| Abstract | Phototropins (phot1 and phot2) are blue light (BL) receptors that mediate
phototropism, chloroplast movements, and stomatal opening in
Arabidopsis
thaliana
. Physiological studies have suggested that Ca
2+
in
the cytoplasm plays a pivotal role in these BL-induced responses. A
phot1-mediated increase in cytosolic Ca
2+
was reported in
deetiolated seedlings of
A. thaliana
; however, the contribution of
phot2 remains unknown. We examined a BL-induced transient increase in
cytosolic free Ca
2+
in leaves of transgenic
A. thaliana
of
WT plants,
phot1
and
phot2
mutants, and
phot1 phot2
double mutants expressing the Ca
2+
-sensitive luminescent protein
aequorin. phot1 and phot2 had different photosensitivities: phot1 increased
cytosolic Ca
2+
at lower fluence rates (0.1–50
μmol·m
-2
·s
-1
) and phot2 increased it at
higher fluence rates (1–250
μmol·m
-2
·s
-1
). By using Ca
2+
channel blockers, Ca
2+
chelating agents, and inhibitors of
phospholipase C, we further demonstrated that both phot1 and phot2 could
induce Ca
2+
influx from the apoplast through the Ca
2+
channel in the plasma membrane, whereas phot2 alone induced phospholipase
C-mediated phosphoinositide signaling, which might result in Ca
2+
release from internal Ca
2+
stores. These results suggest that phot1
and phot2 mediate the BL-induced increase in cytosolic free Ca
2+
differently. |
|---|---|
| AbstractList | Phototropins (phot1 and phot2) are blue light (BL) receptors that mediate
phototropism, chloroplast movements, and stomatal opening in
Arabidopsis
thaliana
. Physiological studies have suggested that Ca
2+
in
the cytoplasm plays a pivotal role in these BL-induced responses. A
phot1-mediated increase in cytosolic Ca
2+
was reported in
deetiolated seedlings of
A. thaliana
; however, the contribution of
phot2 remains unknown. We examined a BL-induced transient increase in
cytosolic free Ca
2+
in leaves of transgenic
A. thaliana
of
WT plants,
phot1
and
phot2
mutants, and
phot1 phot2
double mutants expressing the Ca
2+
-sensitive luminescent protein
aequorin. phot1 and phot2 had different photosensitivities: phot1 increased
cytosolic Ca
2+
at lower fluence rates (0.1–50
μmol·m
-2
·s
-1
) and phot2 increased it at
higher fluence rates (1–250
μmol·m
-2
·s
-1
). By using Ca
2+
channel blockers, Ca
2+
chelating agents, and inhibitors of
phospholipase C, we further demonstrated that both phot1 and phot2 could
induce Ca
2+
influx from the apoplast through the Ca
2+
channel in the plasma membrane, whereas phot2 alone induced phospholipase
C-mediated phosphoinositide signaling, which might result in Ca
2+
release from internal Ca
2+
stores. These results suggest that phot1
and phot2 mediate the BL-induced increase in cytosolic free Ca
2+
differently. |
| Author | Okada, Kiyotaka Harada, Akiko Sakai, Tatsuya |
| Author_xml | – sequence: 1 givenname: Akiko surname: Harada fullname: Harada, Akiko organization: RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan; and Department of Botany, Graduate School of Sciences, Kyoto University, Kitashirakawa-Oiwake-cho Sakyo-ku, Kyoto 606-8502, Japan – sequence: 2 givenname: Tatsuya surname: Sakai fullname: Sakai, Tatsuya organization: RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan; and Department of Botany, Graduate School of Sciences, Kyoto University, Kitashirakawa-Oiwake-cho Sakyo-ku, Kyoto 606-8502, Japan – sequence: 3 givenname: Kiyotaka surname: Okada fullname: Okada, Kiyotaka organization: RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan; and Department of Botany, Graduate School of Sciences, Kyoto University, Kitashirakawa-Oiwake-cho Sakyo-ku, Kyoto 606-8502, Japan |
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