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expand all sections collapse all sections  Zea mays subsp. mays Gene "orp1"
ID 1119
Name orp1 (GENE SYMBOL)
Synonyms (8)
GRAMENE GENEGR:0200391
Type Gene
Species Zea mays subsp. mays (Maize) [ GR_tax:014546 ]
Germplasm
Description Duplicate factor with orp2; pericarp orange over orp1 orp2 kernels; lethal,
tryptophan auxotroph. Duplicate factor with orp2. Pericarp over homozygous orp1,
orp2 kernels is orange. Double heterozygote selfed produces ear segregating 15:1
for orange kernels, which have orange pigment in the pericarp overlying slightly
smaller double recessive kernels. The pigmentation is caused by reaction of the
maternal pericarp tissue with indole produced by the underlying mutant filial
endosperm of the double recessive kernels (Wright 1989 J Hered 80:229). Mutant
kernels produce near normal seedlings which have the odor of accumulated indole
and which become progressively weaker and die before maturity. The seedlings
have roots and coleoptiles which fluoresce blue under UV light due to
accumulation of anthranilic acid (the synthesis of which is the committed step
in tryptophan biosynthesis). Growth is improved by feeding with tryptophan. Both
orp1 and orp2 code for the B subunit of tryptophan synthase. The genes were
cloned by homology to the corresponding Arabidopsis Gene (Wright et al. 1991 Sci
254:998), indicating that tryptophan is not required for IAA biosynthesis. BNL-
ORP(trpB), UMC193A-ORP(trpB). This gene was originally curated in MaizeGDB
Database and the map position was displayed on the maize bins map if feasible.
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