Mechanism of specific inhibition of phototropism by phenylacetic acid in corn seedling
Using geotropism as a control for phototropism, compounds similar to phenylacetic acid that phototreact with flavins and/or have auxin-like activity were examined for their ability to specifically inhibit phototropism in corn seedlings using geotropism as a control. Results using indole-3-acetic acid, napthalene-1-acetic acid, naphthalene-2-acetic acid, phenylacetic acid, and ..beta..-phenylpyruvic acid suggest that such compounds will specifically inhibit phototropism primarily because of their photoreactivity with flavins and not their auxin activity. In addition, the in vivo concentration of phenylacetic acid required to induce specificity was well below that required to stimulate coleoptile growth. Estimates of the percentage of photoreceptor pigment inactivated by phenylacetic acid (>10%) suggest that phenylacetic acid could be used to photoaffinity label the flavoprotein involved in corn seedling phototropism.
- Research Organization:
- Michigan State Univ., East Lansing, MI (United States)
- DOE Contract Number:
- DE-AC02-76ER01338
- OSTI ID:
- 6500380
- Journal Information:
- Plant Physiol.; (United States), Vol. 67:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ACETIC ACID ESTERS
BIOLOGICAL EFFECTS
PHOTOCHEMICAL REACTIONS
INHIBITION
ISOALLOXAZINES
MAIZE
PLANT GROWTH
SEEDLINGS
CARBOXYLIC ACID ESTERS
CEREALS
CHEMICAL REACTIONS
ESTERS
GRAMINEAE
GRASS
GROWTH
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PLANTS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
550200 - Biochemistry