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Mutants of Arabidopsis thaliana with decreased amplitude in their phototropic responseTwo mutants of Arabidopsis thaliana have been identified with decreased phototropism to 450-nanometer light. Fluence-response relationships for these strains (ZR8 and ZR19) to single and multiple flashes of light show thresholds, curve shapes, and fluence for maximum curvature in first positive' phototropism which are the same as those of the wild type. Similarly, there is no alteration from the wild type in the kinetics of curvature or in the optimum dark period separating sequential flashes in a multiple flash regimen. In addition, in both strains, gravitropism is decreased compared to the wild type by an amount which is comparable to the decrease in phototropism. Based on reciprocal backcrosses, it appears that the alteration is due to a recessive nuclear mutation. It is suggested that ZR8 and ZR19 represent alterations in some step analogous to an amplifier, downstream of the photoreceptor pigment, and common to both phototropism and gravitropism.
Document ID
20040112073
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Khurana, J. P.
(Michigan State University-Department of Energy Plant Research Laboratory East Lansing 48824)
Ren, Z.
Steinitz, B.
Parks, B.
Best, T. R.
Poff, K. L.
Date Acquired
August 21, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Plant physiology
Volume: 91
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DE-AC02-76ERO-1338
CONTRACT_GRANT: NAGW-882
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 29-20
Non-NASA Center
NASA Discipline Plant Biology
NASA Program Space Biology

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