Table 2.

Changes in chlorophyll content and photosynthetic parameters of cotton leaves after formation of brown rings under boron (B) deficiency compared with normal petioles (control).

Treatment	Functional leaf area (cm2)	Chlorophyll content (SPAD value)	Photosynthetic rate (µmol m−2 s−1)	Transpiration rate (mmol m−2 s−1)	Stomatal conductance (mol H2O m−2 s−1)
Control	93.18 ± 1.69a	39.75 ± 0.77a	20.07 ± 0.55a	7.65 ± 0.50a	0.32 ± 0.02a
B deficiency	87.65 ± 3.32b	38.28 ± 0.93a	15.04 ± 1.46b	5.49 ± 0.39b	0.23 ± 0.03b

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