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Effects of Atmospheric CO2 Enrichment and Foliar Methanol Application on Net Photosynthesis of Sour Orange Tree (Citrus aurantium; Rutaceae) Leaves

Sherwood B. Idso, Kieth E. Idso, Richard L. Garcia, Bruce A. Kimball and J. Kenneth Hoober
American Journal of Botany
Vol. 82, No. 1 (Jan., 1995), pp. 26-30
Stable URL: http://www.jstor.org/stable/2445782
Page Count: 5
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Effects of Atmospheric CO2 Enrichment and Foliar Methanol Application on Net Photosynthesis of Sour Orange Tree (Citrus aurantium; Rutaceae) Leaves
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Abstract

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 μmol mol-1 CO2 and in air enriched with CO2 to a concentration of approximately 700 μmol mol-1. No unambiguous effects of the methanol applications were detected in net photosynthesis measurements made on foliage in either of the two CO2 treatments. The 75% increase in CO2, 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.

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