Genetic separation of phototropism and blue light inhibition of stem elongation

Blue 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...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1992-09, Vol.100 (1), p.267-271
Main Authors: Liscum, E, Young, J.C, Poff, K.L, Hangarter, R.P
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - radiation effects
ARABIDOPSIS THALIANA
Biological and medical sciences
Cell growth
CELLULE
CELULAS
CRECIMIENTO
CROISSANCE
Curvature
Development and Growth Regulation
Fluence
Fundamental and applied biological sciences. Psychology
Genes, Plant
GENETICA
GENETIQUE
HIPOCOTILOS
Hypocotyl - genetics
Hypocotyl - growth & development
Hypocotyl - radiation effects
HYPOCOTYLE
Hypocotyls
INHIBICION
INHIBITION
Life Sciences (General)
Light
LUMIERE
LUZ
MUTANT
MUTANTES
Mutation
Phenotype
Phenotypes
Phototropism
Phototropism - genetics
Phototropism - radiation effects
Physical agents
Plant physiology and development
Plant Stems - genetics
Plant Stems - growth & development
Plant Stems - radiation effects
Plants
Seedlings
Signal transduction
Space life sciences
Stem elongation
TALLO
TIGE
TROPISME
TROPISMO
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:Blue 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.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.100.1.267