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Mutants of Arabidopsis thaliana with altered phototropismThirty five strains of Arabidopsis thaliana (L.) Heynh. have been identified with altered phototropic responses to 450-nm light. Four of these mutants have been more thoroughly characterized. Strain JK224 shows normal gravitropism and "second positive" phototropism. However, while the amplitude for "first positive" phototropism is the same as that in the wild-type, the threshold and fluence for the maximum response in "first positive" phototropism are shifted to higher fluence by a factor of 20-30. This mutant may represent an alteration in the photoreceptor pigment for phototropism. Strain JK218 exhibits no curvature to light at any fluence from 1 micromole m-2 to 2700 micromoles m-2, but shows normal gravitropism. Strain JK345 shows no "first positive" phototropism, and reduced gravitropism and "second positive" phototropism. Strain JK229 shows no measurable "first positive" phototropism, but normal gravitropism and "second positive" phototropism. Based on these data, it is suggested that: 1. gravitropism and phototropism contain at least one common element; 2. "first positive" and "second positive" phototropism contain at least one common element; and 3. "first positive" phototropism can be substantially altered without any apparent alteration of "second positive" phototropism.
Document ID
20040090329
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Khurana, J. P.
(Michigan State University-Department of Energy Plant Research Laboratory East Lansing 48824-1312, United States)
Poff, K. L.
Date Acquired
August 21, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Planta
Volume: 178
ISSN: 0032-0935
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-882
CONTRACT_GRANT: DE-AC02-76ERO-1338
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
NASA Program Space Biology
NASA Discipline Number 29-20
Non-NASA Center

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