Table 2. Changes in stomatal length and stomatal density (Means ± S.D.) in Bt-SY63 and SY63 under ambient and elevated O3.
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Stomatal length (μm )
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Stomatal density (number•cm-2)
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| Variety | Treatment | 64-DAS | 85-DAS | 105-DAS | 64-DAS | 85-DAS | 105-DAS |
| Bt-SY63 | A-O3 | 21.3±2.0 | 22.0±1.6 | 22.7±1.1 | 4.7±0.3 | 4.5±0.3 | 3.6±0.6 |
| E-O3 | 22.7±1.3 | 23.5±1.2 | 23.2±1.8 | 4.1±0.3 | 4.3±0.2 | 3.6±0.8 | |
| SY63 | A-O3 | 24.9±1.2 | 23.9±1.8 | 22.8±1.3 | 4.5±0.6 | 4.0±0.2 | 4.0±0.8 |
| E-O3 | 23.9±1.4 | 23.7±1.5 | 22.7±2.6 | 4.3±0.7 | 4.2±0.4 | 4.0±0.7 | |
| Effect | Significance of repeated measures of general linear model | ||||||
| Stomatal length | Stomatal density | ||||||
| O3 | n.s. | n.s. | |||||
| Variety | n.s. | n.s. | |||||
| O3 × variety | n.s. | n.s. | |||||
| Time | n.s. | n.s. | |||||
| Time × O3 | n.s. | n.s. | |||||
| Time × variety | n.s. | n.s. | |||||
| Time × O3 × variety | 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, ** p < 0.01, n.s. = not significant