Fig. 2
A Chlorophyll a (mg·g−1), B chlorophyll b (mg·g−1), and C carotenoid (mg·g−1) contents in fresh weight in cotton subtending leaves of CCRI-69 and XLZ-30 under control (2.5 mmol·L−1), and high (5 mmol·L−1) N conditions at 10, 25 and 40 days post-anthesis (DPA). Error bars with different lower-case letters show a significant difference between genotypes under control and high N condition, those with different capital letters in the brackets show significant difference among growth stages (10, 25 and 40 DPA) at P < 0.05