Table 3.

Effects of elevated CO₂ on stomatal parameters in F1 and F5

Generation	Stage	CO2	SD (mm−2)	SA (μm2)	SAI (%)
F1	Jointing	A	532 ± 5 a	302.5 ± 1.2 a	16.1 ± 0.1 a
		E a	538 ± 3 a	273.8 ± 0.7 b	14.7 ± 0.1 b
	Heading	A	724 ± 6 a	258.5 ± 0.8 a	18.7 ± 0.2 a
		E a	719 ± 4 a	252.2 ± 0.9 b	18.1 ± 0.1 b
F5	Jointing	A	514 ± 9 a	133.1 ± 2.1 a	6.9 ± 0.2 a
		E g	528 ± 10 a	127.5 ± 1.7 ab	6.8 ± 0.2 a
		E a	532 ± 10 a	123.0 ± 1.8 b	6.6 ± 0.1 a
	Filling	A	702 ± 12 a	111.8 ± 1.7 a	7.8 ± 0.2 a
		E g	706 ± 12 a	111.3 ± 1.6 a	7.8 ± 0.2 a
		E a	710 ± 11 a	111.0 ± 1.4 a	7.9 ± 0.2 a

Abbreviations: SA, stomatal apparatus area; SAI, stomatal apparatus area index; SD, stomatal density. Values are the mean ± s.e.m. (n = 4). Different lowercase letters indicate significant differences among CO₂ treatments (P < 0.05).