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Leaf NRA activity of the ten bottle gourd genotypes and two watermelon cultivars grown under low (0.3 mM) and high (3.0 mM) N supply in Expt. 1. Values denoted by different letters (lower- and upper-case letters for low and high N supply, respectively) are significantly different between genotypes within columns at p < 0.05. ns, non-significant. * p < 0.05, ** p < 0.01 and *** p < 0.001.
