Mechanisms to avoid photoinhibition in a desiccation-tolerant cyanobacterium, Nostoc commune.
A desiccation-tolerant cyanobacterium, Nostoc commune, shows unique responses to dehydration. These responses are: (i) loss of PSII activity in parallel with the loss of photosynthesis; (ii) loss of PSI activity; and (iii) dissipation of light energy absorbed by pigment-protein complexes. In this study, the deactivation of PSII is shown to be important in avoiding photoinhibition when the Calvin-Benson cycle is repressed by dehydration. Furthermore, our evidence suggests that dissipation of light energy absorbed by PSII blocks photoinhibition under strong light in dehydrated states.
Fukuda
Shin-ya
SY
Department of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo, 678-1297 Japan. s710624jp@yahoo.co.jp
Yamakawa
Ruriko
R
Hirai
Manabu
M
Kashino
Yasuhiro
Y
Koike
Hiroyuki
H
Satoh
Kazuhiko
K
D003890:Desiccation; D050501:Nostoc commune / Q000378:metabolism* / Q000528:radiation effects*; D010788:Photosynthesis / Q000502:physiology / Q000528:radiation effects; D045331:Photosystem I Protein Complex / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000378:metabolism; D013696:Temperature; D014867:Water / Q000378:metabolism*
D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D014867:Water