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Effect of Bacterial Infection on Speed and Horizontal Trajectory of Circumnutation in Bean Shoots. B. W. Kennedy, Department of Plant Pathology, University of Minnesota, St. Paul 55108; R. L. Denny(2), L. Carlson(3), and W. L. Koukkari(4). (2)Department of Plant Pathology, University of Minnesota, St. Paul 55108; (3)(4)Department of Botany, University of Minnesota, St. Paul 55108. Phytopathology 76:712-715. Accepted for publication 18 February 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/Phyto-76-712.

Circumnutation movements of Phaseolus vulgaris ‘Kentucky Wonder' are inhibited by either of the two bacterial pathogens Xanthomonas campestris pv. phaseoli or Corynebacterium flaccumfaciens. Pattern of the horizontal trajectory and speed of the shoot tip are influenced by length of the free-moving shoot. In infected plants, length of the shoot is often reduced, along with the speed of the tip. However, when shoots of healthy and infected plants are of equal length, speed is slower in infected plants. Results from these studies suggest that effects of the two bacterial pathogens on circumnutation movements of bean shoots involve more than a reduction in shoot length.