Figure 1.
Phenotypic changes in the leaf blade and petiole of coronatine (COR) and water (Control) treated plants.
A and C are phenotypes for 14 d distilled water treated materials, B and D are phenotypes for 14 d COR treated materials. AZ: leaf abscission zone. Bar: A, B 4 cm; C, D 3 mm.
Figure 2.
Scanning electron micrograph of cells at the petiole and stem juncture, abscission zone (A, B, C), and fracture plane (D, E) of the cotton leaf abscission zone.
A and D are micrographs of 14 d distilled water treated materials, B, C and E are micrographs of 14 d COR treated materials. s: stem, v: vascular bundles, c: cortex, p: petiole, AZ: leaf abscission zone. Bar: A 1 mm; B 400 µm; C 100 µm; D, E 500 µm.
Figure 3.
Changes in break strength in abscission zone and adjacent cells treated with water (Control), thidiazuron (TDZ) and coronatine (COR) under glasshouse (A) and field (B, C) conditions.
Each value represents the mean ± SE of three replicates. Bars with the same letters are not significantly different.
Figure 4.
Temporal changes in the relative expression of GhCEL1, GhPG and GhACS in AZ treated with water (Control), thidiazuron (TDZ) and coronatine (COR), and signalling pathways in various cotton tissues at 12 hours after treatment.
L: leaf; P: petiole; AZ: leaf abscission zone. Each value represents the mean ± SE of three replicates. Bars with the same letters are not significantly different.
Figure 5.
Temporal changes in the activity of cellulase (CEL), polygalacturonase (PG) and ACC in AZ treated with water (Control), thidiazuron (TDZ) and coronatine (COR).
Different tissues from Control, TDZ or COR treated plants for 5: leaf; P: petiole; AZ: leaf abscission zone; B: boll crust. Each value represents the mean ± SE of three replicates. Bars with the same letters are not significantly different.
Figure 6.
Effect of Thidiazuron (TDZ) and coronatine (COR) on defoliation and boll opening at 21 days after treatment in 2010 and 2011.
Each value represents the mean ± SE of three replicates. Bars with the same letters are not significantly different.
Table 1.
Effect of Thidiazuron (TDZ) and coronatine (COR) on seedcotton yield and seed quality in 2010 and 2011.