Fig. 4

A Fructose content (mg·g⁻¹ FW), B sucrose content (mg·g⁻¹ FW), and C sucrose phosphate synthase (SPS) activity (µg·min⁻¹·g⁻¹ FW) in cotton subtending leaves of CCRI-69 and XLZ-30 under the 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 the control and high N condition and capital letters in the brackets show significant difference among growth stages (10, 25, and, 40 DPA) at P < 0.05