Effects of atmospheric CO{sub 2} enrichment and foliar methanol application on net photosynthesis of sour orange tree (Citrus Aurantium; Rutaceae) leaves

Journal Article · Sun Jan 01 04:00:00 EST 1995 · American Journal of Botany

DOI:https://doi.org/10.2307/2445782· OSTI ID:61854

Idso, S B; Garcia, R L; Kimball, B A ^[1]; Idso, K E; Hoober, J K ^[2]

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1. Water Conservation Lab., Phoenix, AR (United States)
2. 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, Journal Name: American Journal of Botany Journal Issue: 1 Vol. 82; ISSN 0002-9122; ISSN AJBOAA
• Country of Publication: United States
• Language: English

Related Subjects

56 BIOLOGY AND MEDICINE
APPLIED STUDIES
BIOLOGICAL EFFECTS
CARBON DIOXIDE
CITRUS
ECOLOGICAL CONCENTRATION
METHANOL
PHOTOSYNTHESIS
TREES