Photosynthesis and Leaf Water Relations in Four American Sycamore Clones

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Photosynthesis, transpiration, stomatal conductance, and xylem pressure potential were studied to examine clonal variation and clone-by-season interactions in rooted cuttings of four sycamore clones (Platanus occidentalis L.). These physiological parameters were measured during June through November of the second and third growing seasons in the field. Stomatal conductance, xylem pressure potential, and photosynthesis were higher in June-July than in August-November. The four clones did not differ significantly in yearly average photosynthetic rates, but clone 11 tended to have higher rates early in each growing season (June-July) than did the other three clones. Dry periods during August-September of the second season and during October of the third season apparently caused clone 11 to close its stomata more than clone 17, as indicated by significant clone-by-season interactions for reductions in stomatal conductance and transpiration late in the morning. Clone 17 was generally able to maintain high xylem pressure potential, stomatal conductance, and transpiration throughout the growing season, probably because of its large root system. For. Sci. 41(4):729-743.

Keywords: Platanus occidentalis L; clonal variation; repeated measures analysis; rooted cuttings

Document Type: Journal Article

Affiliations: Former Graduate Research Assistant, Department of Forestry, School of Forest Resources, Mississippi State University, P.O. Box 9681, Mississippi State, MS 39762

Publication date: November 1, 1995

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