Fig. 9. Expression profiles of putative genes involved in citrulline catabolic pathways in the flesh and rind tissues of developing watermelon fruits (numbers on X-axis are days after transplanting). The error bars represent the means ± SD (n = 3), and different letters show significant differences in the expression of a specific gene within tissue type (p <0.05). ASS-1, 2, 3 - Argininosuccinate synthase; ASL-1, 2 -Argininosuccinate lyase; ARG - Arginase; ODC - Ornithine decarboxylase; ADC - Arginine decarboxylase.