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Plant Physiology 83:225-227 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

Acifluorfen Enhancement of Cryptochrome-Modulated Sporulation following an Inductive Light Pulse

Victor Gaba1 and Jonathan Gressel2

Department of Plant Genetics, Weizmann Institute of Science, Rehovot IL-76100, Israel

Acifluorfen enhancement of blue-light mediated phototropism suggested that this diphenyl-ether herbicide augments the light reaction (TY Leong, WR Briggs 1983 Plant Physiol 70: 875-881). The separation of the possible direct interaction of acifluorfen with light reactions from interactions with dark pathways has been elucidated in this paper with Trichoderma harzianum. Acifluorfen at 30 micromolar, given for 5 hours in the growth medium, stimulated the conidiation of Trichoderma in response to blue light without apparently affecting growth. Enhanced conidiation could be elicited by dipping cultures into medium with acifluorfen both before as well as 0.5 hour after inductive blue light. This postphotoinduction stimulation indicates that acifluorfen does not directly augment the effect of light by interacting with cryptochrome(s) in Trichoderma. Instead, acifluorfen most probably interacted with the dark reactions following photoinduction.

1 Supported by a Royal Society-Israel Academy of Sciences and Humanities Fellowship. Present address: Plant Biotech Industries Miluot, Mobile Post Ashrat 25201, Israel.

2 The Gilbert de Botton Professor of Plant Sciences.






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Copyright © 1987 by the American Society of Plant Biologists