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Genetic separation of phototropism and blue light inhibition of stem elongationBlue light-induced regulation of cell elongation is a component of the signal response pathway for both phototropic curvature and inhibition of stem elongation in higher plants. To determine if blue light regulates cell elongation in these responses through shared or discrete pathways, phototropism and hypocotyl elongation were investigated in several blue light response mutants in Arabidopsis thaliana. Specifically, the blu mutants that lack blue light-dependent inhibition of hypocotyl elongation were found to exhibit a normal phototropic response. In contrast, a phototropic null mutant (JK218) and a mutant that has a 20- to 30-fold shift in the fluence dependence for first positive phototropism (JK224) showed normal inhibition of hypocotyl elongation in blue light. F1 progeny of crosses between the blu mutants and JK218 showed normal phototropism and inhibition of hypocotyl elongation, and approximately 1 in 16 F2 progeny were double mutants lacking both responses. Thus, blue light-dependent inhibition of hypocotyl elongation and phototropism operate through at least some genetically distinct components.
Document ID
Document Type
Reprint (Version printed in journal)
Liscum, E.
(The Ohio State University Columbus 43210)
Young, J. C.
Poff, K. L.
Hangarter, R. P.
Date Acquired
August 21, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Plant physiology
Volume: 100
Issue: 1
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Funding Number(s)
Distribution Limits
Non-NASA Center
NASA Discipline Number 40-50
NASA Program Space Biology
NASA Discipline Plant Biology

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