an essential component of the cyclic electron flow around PSI, increased, suggesting that in
these conditions cyclic electron flow helps protect photosystems. However, when the stem,
but not the root, was cooled cyclic electron flow did not increase and PSII was damaged as
a result of insufficient dissipation of the excess light energy. In contrast, the chlororespiratory
enzymes (NDH complex and PTOX) remained similar to control when the whole plant
was cooled, but increased when only the stem was cooled, suggesting the involvement of
chlororespiration in the response to chilling stress when other pathways, such as cyclic
electron flow around PSI, are insufficient to protect PSII.
an essential component of the cyclic electron flow around PSI, increased, suggesting that inthese conditions cyclic electron flow helps protect photosystems. However, when the stem,but not the root, was cooled cyclic electron flow did not increase and PSII was damaged asa result of insufficient dissipation of the excess light energy. In contrast, the chlororespiratoryenzymes (NDH complex and PTOX) remained similar to control when the whole plantwas cooled, but increased when only the stem was cooled, suggesting the involvement ofchlororespiration in the response to chilling stress when other pathways, such as cyclicelectron flow around PSI, are insufficient to protect PSII.
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