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Plant Physiology 92:1021-1028 (1990)
© 1990 American Society of Plant Biologists

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Environmental and Stress Physiology

Root Hypoxia Reduces Leaf Growth 1

Role of Factors in the Transpiration Stream

Barbara A. Smit, Dawn S. Neuman and Matthew L. Stachowiak

Center for Urban Horticulture, GF-15, University of Washington, Seattle, Washington 98195

This study examined the potential role of restricted phloem export, or import of substances from the roots in the leaf growth response to root hypoxia. In addition, the effects of root hypoxia on abscisic acid (ABA) and zeatin riboside (ZR) levels were measured and their effects on in vitro growth determined. Imposition of root hypoxia in the dark when transpirational water flux was minimal delayed the reduction in leaf growth until the following light period. Restriction of phloem transport by stem girdling did not eliminate the hypoxia-induced reduction in leaf growth. In vitro growth of leaf discs was inhibited in the presence of xylem sap collected from hypoxic roots, and also by millimolar ABA. Disc growth was promoted by sap from aerated roots and by 0.1 micromolar ZR. The flux of both ABA and ZR was reduced in xylem sap from hypoxic roots. Leaf ABA transiently increased twofold after 24 hours of hypoxia exposure but there were no changes in leaf cytokinin levels.

1 Supported in part by the U.S. Department of Agriculture under grant No. 87-CRCR-1-2493 and the Washington Technology Center.




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