Plant Physiol.
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Plant Physiology 54:169-172 (1974)
© 1974 American Society of Plant Biologists

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Articles

Efficiency and Regulation of Water Transport in Some Woody and Herbaceous Species 1

Saul E. Camacho-B2, Anthony E. Hall and Merrill R. Kaufmann

a Department of Plant Science, University of California, Riverside, California 92502

The efficiency with which plants transport water is related to the water potential differences required to drive water fluxes from the soil to the leaf. A comparative study of two woody and three herbaceous species (Citrus sinensis L. cv. Koethen, Pyrus kawakami L., Helianthus annuus L. cv. Mammoth Russian, Capsicum frutescens L. cv. Yolo Wonder, and Sesamum indicum L. cv. Glauca) indicated contrasts in water transport efficiency. Depression of leaf water potential in response to transpiration increases was found in the woody species; the herbaceous species, however, had more efficient water transport systems and presented no measurable response of leaf water potential to transpiration changes. Different maximum transpiration rates under the same climatic conditions were observed with different species and may be accounted for by stomatal response to humidity gradients between leaf and air. Leaf diffusion resistance in sesame increased markedly as the humidity gradient was increased, while leaf resistance of sunflower responded less to humidity. Stomata appeared to respond directly to the humidity gradient because changes in leaf water potential were not detected when leaf resistance increased or decreased.

2 Present address: Programa Nacional Fisiologia Vegetal Instituto, Colombiano Agropecurio ICA, Apartado Aereo No. 151123 El Dorado, Bogota. D. E., Columbia S.A.

1 This work was supported by National Science Foundation Grant GB 39856. This study represents part of a thesis submitted by S. E. Camacho-B in partial fulfillment of the requirements for the Ph.D. degree at the University of California, Riverside.






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Copyright © 1974 by the American Society of Plant Biologists