Abstract
The effects of two anion/Cl − channel inhibitors, Zn 2+ and niflumic acid (NA), on seedling photosynthetic and fluorescent parameters of two Glycine soja populations (salt-tolerant BB52; salt-sensitive N23227) and Glycine max cultivar (salt-tolerant Lee68) were studied and compared under salt stress. Treatments with Zn 2+ and NA only (10, 20 μmol L −1) were also imposed for comparisons. Results showed that, there were non-toxic and non-nutritional effects of Zn 2+ and NA treatments alone on seed germination and seedling growth of soybeans. Under 150 mmol L −1 NaCl for 6 d, leaf chlorophyll and carotenoid contents, net photosynthetic rate ( P n), stomatal conductance ( G s), intercellular CO 2 concentration ( C i), transpiration rate (Tr), and the maximum photochemical efficiency of photosystem II (PS II) ( F v/ F m) except the stomatal limitation (Ls) significantly decreased in three kinds of soybean seedlings when compared with their control plants. The NaCl stress plus additional 20 μmol L −1 Zn showed an obvious enhancement of leaf chlorophyll and carotenoid contents, P n, G s, C i and Tr, especially for the G. max cultivar Lee68, but the supplementation of 20 μmol L −1 NA showed the reverse effects.
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