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Effect of R/FR on chlorophyll fluorescence parameters in cucumber leaves under salt stress. (A), maximal photochemical quantum yield of PSII (F v/F m) images of cucumber leaves; (B), Chlorophyll a fluorescence transient (OJIP) curve; (C), JIP-test parameters calculated according to OJIP curve. Different letters indicate significant differences (P< 0.05; n= 4).
