Table 2 Effects of alkaline stress on chlorophyll a, chlorophyll b and total chlorophyll contents of three willow cuttings. (In statistical terms, the letters a, b, c, and d represent significant differences among the respective data at the P ≤ 0.05 level).
From: Responses of growth and photosynthesis to alkaline stress in three willow species
Targets | Process | Tree species | ||
|---|---|---|---|---|
pH | Salix matsudana | Salix gordejevii | Salix linearistipularis | |
Chlorophyll a content of leaves (mg/g) | 7.2 | 1.390 ± 0.039a | 1.428 ± 0.033a | 1.617 ± 0.102a |
8.0 | 1.396 ± 0.169a | 1.285 ± 0.133b | 1.326 ± 0.268b | |
8.5 | 1.258 ± 0.160b | 1.179 ± 0.224b | 1.184 ± 0.268b | |
9.0 | 1.068 ± 0.193c | 1.012 ± 0.242c | 0.966 ± 0.260c | |
9.5 | 0.907 ± 0.193d | 0.934 ± 0.096c | 0.893 ± 0.124c | |
Chlorophyll b content of leaves (mg/g) | 7.2 | 0.540 ± 0.015a | 0.547 ± 0.017a | 0.579 ± 0.034a |
8.0 | 0.507 ± 0.074a | 0.487 ± 0.057b | 0.482 ± 0.083b | |
8.5 | 0.451 ± 0.072b | 0.447 ± 0.092b | 0.454 ± 0.069b | |
9.0 | 0.379 ± 0.069c | 0.383 ± 0.090c | 0.380 ± 0.091c | |
9.5 | 0.334 ± 0.070d | 0.351 ± 0.034c | 0.350 ± 0.048c | |
Total chlorophyll content of leaves (mg/g) | 7.2 | 1.930 ± 0.043a | 1.975 ± 0.034a | 2.197 ± 0.134a |
8.0 | 1.903 ± 0.239a | 1.771 ± 0.186b | 1.808 ± 0.348b | |
8.5 | 1.709 ± 0.228b | 1.625 ± 0.315b | 1.637 ± 0.335b | |
9.0 | 1.448 ± 0.261c | 1.395 ± 0.331c | 1.345 ± 0.346c | |
9.5 | 1.241 ± 0.262d | 1.284 ± 0.128c | 1.243 ± 0.164c | |
