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Stomatal Responses to Environmental Variables in Shade and Sun Grown Coffee Plants in Mexico

Published online by Cambridge University Press:  03 October 2008

Luis Fanjul ,
R. Arreola-Rodriguez  and
M. P. Mendez-Castrejon
Luis Fanjul
Affiliation:
Instituto de Biología, Depto de Ecología, Universidad Nacional Autónoma de México, Apartado Postal 70-233, 04510 México DF, México
R. Arreola-Rodriguez
Affiliation:
Instituto de Biología, Depto de Ecología, Universidad Nacional Autónoma de México, Apartado Postal 70-233, 04510 México DF, México
M. P. Mendez-Castrejon
Affiliation:
Instituto de Biología, Depto de Ecología, Universidad Nacional Autónoma de México, Apartado Postal 70-233, 04510 México DF, México
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Summary

The influence of air temperature (T), vapour pressure deficit (vpd), irradiance (Q) and leaf water potential (ψ) on diurnal stomatal movement of coffee plants was examined under field and controlled environmental conditions. Leaves of plants grown under shade had larger stomatal conductance (g) values than plants grown in open sun. Stomatal responses to vpd under constant temperature conditions were very strong, indicating that ambient humidity could play a major role in controlling stomatal aperture. Changes in g as vpd increased probably contributed to observed reductions in the rate of net photosynthesis (Pn), though the effect of vpd on Pn was smaller.

Type
Research Article
Information
Experimental Agriculture , Volume 21 , Issue 3 , July 1985 , pp. 249 - 258
Copyright
Copyright © Cambridge University Press 1985

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