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Involvement of chlororespiration in chilling stress in the tropical species S pathiphyllum wallisii
Author(s) -
SEGURA MARÍA V.,
QUILES MARÍA J.
Publication year - 2015
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12406
Subject(s) - photosynthesis , photosystem ii , photosystem i , electron transport chain , chemistry , electron flow , horticulture , electron transfer , botany , biology , biophysics , biochemistry , photochemistry
S pathiphyllum wallisii plants were used to study the effect of chilling stress under high illumination on photosynthesis and chlororespiration. Leaves showed different responses that depended on root temperature. When stem, but not root, was chilled, photosystem II ( PSII ) was strongly photoinhibited. However, when the whole plant was chilled, the maximal quantum yield of PSII decreased only slightly below the normal values and cyclic electron transport was stimulated. Changes were also observed in the chlororespiration enzymes and PGR 5. In whole plants chilled under high illumination, the amounts of NADH dehydrogenase ( NDH ) complex and plastid terminal oxidase ( PTOX ) remained similar to control and increased when only stem was chilled. In contrast, the amount of PGR 5 polypeptide was higher in plants when both root and stem were chilled than in plants in which only stem was chilled. The results indicated that the contribution of chlororespiration to regulating photosynthetic electron flow is not relevant when the whole plant is chilled under high light, and that another pathway, such as cyclic electron flow involving PGR 5 polypeptide, may be more important. However, when PSII activity is strongly photoinhibited in plants in which only stem is chilled, chlororespiration, together with other routes of electron input to the electron transfer chain, is probably essential.