Table 1.

Changes in the composition of cotton petioles after formation of brown rings under boron (B) deficiency compared with normal petioles (control).

Treatment	Cross-sectional area of petiole (mm2)	Area of vascular bundles (mm2)	Area of xylem (mm2)	Area of Phloem (mm2)	Area of Phloem fiber (mm2)	Catheter diameter (μm)	Area of Catheter (mm2)	Lignin (%)
Control	4.73 ± 0.04a	0.95 ± 0.02b	0.27 ± 0.01b	0.30 ± 0.01b	0.16 ± 0.01a	33.20 ± 0.26a	940.66 ± 8.91a	8.04 ± 0.44b
Rings	4.85 ± 0.11a	1.10 ± 0.03a	0.31 ± 0.02a	0.37 ± 0.01a	0.17 ± 0.01a	29.53 ± 0.54b	687.3 ± 17.69b	12.09 ± 0.42a

Values are the mean ± SE of six replicates. Different lowercase letters in a column indicate statistically significant difference at p < 0.05.