Articles
STUDIES ON THE PHOTOSYNTHETIC CHARACTERISTICS OF CHINESE TOON
Article number
769_14
Pages
119 – 123
Language
English
Abstract
Photosynthesis of Chinese toon (Cedrela sinensis Juss) at different growth stages, different leaf ages and the daily photosynthetic changes, as well as the influences of CO2 concentration, light intensity and paclobutrazol (PP-333) treatment was studied.
Highest photosynthetic rates were observed in plants showing rapid growth, and in leaves aged 20-60 d.
The daily photosynthetic rates varied showing a double peak curve, reaching the first peak at about 9:00 AM and the second peak at about 15:00 PM. When the plants were treated with PP-333, the plants of Chinese toon were dwarfed, but the photosynthetic rate was slightly increased.
According to the calculation from Pn-CO2 and Pn-PFD response curves, the light compensation point was estimated to be 94.7 μmolm-2s-1, light saturation point 1369.4 μmolm-2s-1, and the CO2 compensation point and CO2 saturation point were 101.5 μlL-1 and 1331.9 μlL-1 respectively.
Highest photosynthetic rates were observed in plants showing rapid growth, and in leaves aged 20-60 d.
The daily photosynthetic rates varied showing a double peak curve, reaching the first peak at about 9:00 AM and the second peak at about 15:00 PM. When the plants were treated with PP-333, the plants of Chinese toon were dwarfed, but the photosynthetic rate was slightly increased.
According to the calculation from Pn-CO2 and Pn-PFD response curves, the light compensation point was estimated to be 94.7 μmolm-2s-1, light saturation point 1369.4 μmolm-2s-1, and the CO2 compensation point and CO2 saturation point were 101.5 μlL-1 and 1331.9 μlL-1 respectively.
Authors
K. Xu, G.Q. Zhang
Keywords
Cedrela sinensis, photosynthesis, PP-333, plant height, leaf age
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