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Release of Plant Moisture Stress and Self-Tripping in Alfalfa¹

Two experimental clones of alfalfa (Medicago sativa L.) were vegetatively propagated and grown to flowering in a plant growth chamber. Water was withheld from some of the plants to induce plant moisture stress which was measured by the relative turgidity (R.T.) method. After visible wilting was noted, water was supplied and recovery from water stress and flower tripping were measured periodically. Wilted plants recovered in 90 minutes and approximately 70%, of all open florets on one clone tripped within 2 hours. In this clone, percent of tripping after watering was highly correlated with R.T. of the plant before watering (r = — 0.856). Plants of the second clone similarly recovered from wilting, but no tripping occurred. Tripping in some alfalfas may becaused by recovery of turgidity.

Key Words: Relative turgidity • Alfalfa seed production

² No. 39. Received Sept. 29, 1971.a Plant Physiologist. Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, University of Arizona, Tucson, Arizona 85719.

Received for publication September 29, 1971.