Effects of atmospheric CO{sub 2} enrichment and foliar methanol application on net photosynthesis of sour orange tree (Citrus Aurantium; Rutaceae) leaves
- Water Conservation Lab., Phoenix, AR (United States)
- Arizona State Univ., Tempe, AR (United States)
Foliar spray applications of 40% aqueous methanol were made to sunlit leaves of sour orange trees that had been grown continuously in clear-plastic-wall open-top enclosures maintained out-of-doors at Phoenix, Arizona, for over 5.5 years in ambient air of approximately 400 {mu}mol mol{sup -1} CO{sub 2} and in air enriched with CO{sub 2} to a concentration of approximately 700 {mu}mol mol{sup -1}. No unambiguous effects of the methanol applications were detected in photosynthesis measurements made on foliage in either of the two CO{sub 2} treatments. THe 75% increase in CO{sub 2}, however, raised the upper-limiting leaf temperature for positive net photosynthesis by approximately 7 C, which resulted in a 75% enhancement in net photosynthesis at a leaf temperature of 31 C, a 100% enhancement at a leaf temperature of 35 C, and a 200% enhancement at 42 C. 13 refs., 2 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AI05-88ER69014
- OSTI ID:
- 61854
- Journal Information:
- American Journal of Botany, Vol. 82, Issue 1; Other Information: PBD: Jan 1995
- Country of Publication:
- United States
- Language:
- English
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