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Plant Physiology 81:768-773 (1986)
© 1986 American Society of Plant Biologists

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Articles

Stomatal Responses to Light and Drought Stress in Variegated Leaves of Hedera helix1

Pedro J. Aphalo and Rodolfo A. Sánchez

Programa Productividad de Sistemas Agropecuarios Departmento de Ecología, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417 Buenos Aires, Argentina

Direct and indirect mechanisms underlying the light response of stomata were studied in variegated leaves of the juvenile phase of Hedera helix L. Dose response curves of leaf conductance were measured with blue and red light in leaves kept in normal or in an inverted position. In the green portions of the leaves, the sensitivity to blue light was nearly 100 times higher than that to red light. No response to red light was observed in the white portions of the leaves up to 90 micromoles per square meter per second. Red light indirectly affected leaf conductance while blue light had a direct effect. Leaf conductance was found to be more sensitive to drought stress and showed a more persistent aftereffect in the white portions of the leaves. A differential effect of drought stress on the responses to blue and red light was also observed.

1 Supported by Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Part of the work described in this paper was undertaken by P. J. A. in partial fulfillment of the requirements for the degree of Ingeniero Agronomo, University of Buenos Aires.






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