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Effects of long-term atmospheric CO2 enrichment on the mineral concentration of Citrus aurantium leaves

Published online by Cambridge University Press:  01 March 1997

JOSEP PEÑUELAS ,
SHERWOOD B. IDSO ,
ANGELA RIBAS  and
BRUCE A. KIMBALL
JOSEP PEÑUELAS
Affiliation:
CREAF, Centre de Recerca Ecològica i Aplicacions Forestals, Facultat de Ciències, Universitat Autònoma, 08193 Bellaterra (Barcelona), Spain
SHERWOOD B. IDSO
Affiliation:
U.S. Water Conservation Laboratory, ARS-USDA, 4331 E. Broadway, Phoenix, AZ 85040, USA
ANGELA RIBAS
Affiliation:
CREAF, Centre de Recerca Ecològica i Aplicacions Forestals, Facultat de Ciències, Universitat Autònoma, 08193 Bellaterra (Barcelona), Spain
BRUCE A. KIMBALL
Affiliation:
U.S. Water Conservation Laboratory, ARS-USDA, 4331 E. Broadway, Phoenix, AZ 85040, USA
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Abstract

Leaf mineral concentration of Citrus aurantium (sour orange tree) was measured at bi-monthly intervals from 30 to 85 months of exposure in a long-term study on the effects of a 300 µmol mol−1 enrichment of atmospheric CO2, under conditions of high nutrient and water supply. There were clear seasonal trends in the concentrations of most of the elements studied. There were initial decreases in the leaf concentrations of N and the xylem-mobile, phloem-immobile elements Mn, Ca and Mg, as well as a significant and sustained increase in the leaf concentration of B, and no changes in the concentrations of K, Fe, Na, P, S, Zn and Cu. Interestingly, the initial reductions in the leaf concentrations of Mn, N, Ca and Mg gradually disappeared with time.

Keywords

Citrus aurantiumsour orange treescarbon dioxideleaf mineral concentrationacclimation
Type
Research Article
Information
The New Phytologist , Volume 135 , Issue 3 , March 1997 , pp. 439 - 444
Copyright
© Trustees of The New Phytologist 1997

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