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Leaf Light Response of Cassava cv. Huay Bong 60 under Normal and Low O 2 in Combination with 3 CO 2 Concentrations |
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| รหัสดีโอไอ | |
| Creator | Pornchai Paiboon |
| Title | Leaf Light Response of Cassava cv. Huay Bong 60 under Normal and Low O 2 in Combination with 3 CO 2 Concentrations |
| Contributor | Suntaree Yingjajaval |
| Publisher | Department of Agriculture |
| Publication Year | 2563 |
| Journal Title | Thai Agricultural Research Journal |
| Journal Vol. | 38 |
| Journal No. | 3 |
| Page no. | 267-276 |
| Keyword | C3 photosynthesis, Maximum gross photosynthetic rate, Light saturation, Photorespiration |
| URL Website | http://at.doa.go.th/journal |
| Website title | Thai Agricultural Research Journal |
| ISSN | 0125-8389 |
| Abstract | The light response functions of cassava cv. Huay Bong 60 were determined under 3 levels of CO2 concentration inside the leaf chamber (Ca) at 400, 800, and 1,200 ?molCO2 mol air-1 to enhance the carboxylation process in combination with 2 levels of O2 concentration at 21% and 2% to suppress the oxygenation process. Results showed that under ambient air (Ca 400 ?molCO2 mol air-1 with 21% O2) cassava leaf had maximum gross photosynthetic rate (Pmax) of 31 ?molCO2 m-2 s-1. The light saturation range was 1,100-1,300 ?molPPF m-2s-1. Maximum electron transport rate (Jmax) was as high as 289 ?mol e- m-2 s-1 and maximum photorespiration, (Rp, max) was 12.4 ?molCO2 m-2 s-1. Elevation of Ca could increase Pmax (26-76% increase) more than the lowering of O2 concentration (6-33% increase), as higher Ca enhanced carboxylation as well as suppressed oxygenation. However, the combination of both enabled Pmax to reach 61.2 ?molCO2 m-2 s -1, or 97% increase, coupling with the reduction in Rp and J. |
