TY - JOUR
T1 - Increased stomatal conductance induces rapid changes to photosynthetic rate in response to naturally fluctuating light conditions in rice
AU - Yamori, Wataru
AU - Kusumi, Kensuke
AU - Iba, Koh
AU - Terashima, Ichiro
N1 - Funding Information:
This work was supported by the Japan Science and Technology Agency, PRESTO (to W.Y.), CREST (to K.I.), and in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (Scientific Research No. 16K20962, 16H06556, 16H06552, 18H02185, and 18KK0170 to W.Y., No. 26221103 to K.I.).
Publisher Copyright:
© 2020 John Wiley & Sons Ltd.
PY - 2020/5/1
Y1 - 2020/5/1
N2 - A close correlation between stomatal conductance and the steady-state photosynthetic rate has been observed for diverse plant species under various environmental conditions. However, it remains unclear whether stomatal conductance is a major limiting factor for the photosynthetic rate under naturally fluctuating light conditions. We analysed a SLAC1 knockout rice line to examine the role of stomatal conductance in photosynthetic responses to fluctuating light. SLAC1 encodes a stomatal anion channel that regulates stomatal closure. Long exposures to weak light before treatments with strong light increased the photosynthetic induction time required for plants to reach a steady-state photosynthetic rate and also induced stomatal limitation of photosynthesis by restricting the diffusion of CO2 into leaves. The slac1 mutant exhibited a significantly higher rate of stomatal opening after an increase in irradiance than wild-type plants, leading to a higher rate of photosynthetic induction. Under natural conditions, in which irradiance levels are highly variable, the stomata of the slac1 mutant remained open to ensure efficient photosynthetic reaction. These observations reveal that stomatal conductance is important for regulating photosynthesis in rice plants in the natural environment with fluctuating light.
AB - A close correlation between stomatal conductance and the steady-state photosynthetic rate has been observed for diverse plant species under various environmental conditions. However, it remains unclear whether stomatal conductance is a major limiting factor for the photosynthetic rate under naturally fluctuating light conditions. We analysed a SLAC1 knockout rice line to examine the role of stomatal conductance in photosynthetic responses to fluctuating light. SLAC1 encodes a stomatal anion channel that regulates stomatal closure. Long exposures to weak light before treatments with strong light increased the photosynthetic induction time required for plants to reach a steady-state photosynthetic rate and also induced stomatal limitation of photosynthesis by restricting the diffusion of CO2 into leaves. The slac1 mutant exhibited a significantly higher rate of stomatal opening after an increase in irradiance than wild-type plants, leading to a higher rate of photosynthetic induction. Under natural conditions, in which irradiance levels are highly variable, the stomata of the slac1 mutant remained open to ensure efficient photosynthetic reaction. These observations reveal that stomatal conductance is important for regulating photosynthesis in rice plants in the natural environment with fluctuating light.
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U2 - 10.1111/pce.13725
DO - 10.1111/pce.13725
M3 - Article
C2 - 31990076
AN - SCOPUS:85079449287
VL - 43
SP - 1230
EP - 1240
JO - Plant, Cell and Environment
JF - Plant, Cell and Environment
SN - 0140-7791
IS - 5
ER -