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(A) Actual quantum yield of photosystem II (ΦPSII), (B) electron transport rate (ETR) and (C) non-photochemical quenching (qN) of chlorophyll fluorescence of the fully expanded youngest leaf under either control conditions, or 6 and 12 dS m−1 measured 7 d after the start of the salt stress treatment during the seedling stage in experiment Ia. Data are means of three cultivars each replicated three times, and vertical bars indicate SE.
