Table 1. Changes in leaf length, leaf width and leaf area (Means ± S.D.) in Bt-SY63 and SY63 under ambient and elevated O₃.

		Leaf length (cm)			Leaf width (cm)			Leaf area (cm2)
Variety	Treatment	64-DAS	85-DAS	105-DAS	64-DAS	85-DAS	105-DAS	64-DAS	85-DAS	105-DAS
Bt-SY63	A-O3	48.27±1.38	47.43±2.29	46.95±2.71	1.62±0.29	1.84±0.09	1.84±0.03	58.68±11.54	65.88±5.76	64.68±3.25
	E-O3	52.11±3.61	46.60±1.72	49.37±3.15	1.84±0.15	1.89±0.13	1.87±0.08	72.52±9.98	66.16± 5.76	69.48±7.35
SY63	A-O3	55.23±4.24	54.89±1.21	46.47±4.09	1.89±0.08	1.96±0.04	1.81±0.08	77.96± 8.88	80.63±3.30	67.54±6.60
	E-O3	54.17±4.02	51.19±6.87	49.07±3.40	1.84±0.14	1.88±0.11	1.83±0.10	74.56±0.25	72.50±13.16	63.36±8.17
Effect		Significance of repeated measures of general linear model
		Leaf length			Leaf width			Leaf area
O3		n.s.			n.s.			n.s.
Variety		*			n.s.			*.
O3 × variety		n.s.			n.s.			n.s.
Time		*			n.s.			n.s.
Time × O3		n.s.			n.s.			n.s.
Time × variety		n.s.			n.s.			n.s.
Time × O3 × variety		n.s.			n.s.			n.s.

A-O₃, Ambient O₃; E-O₃, Elevated O₃. Mean values and standard deviation of ten replicates are presented.

ANOVA: * p < 0.05, n.s. = not significant.