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expand all sections collapse all sections  Zea mays subsp. mays Gene "sh1"
ID 2374
Name sh1 (GENE SYMBOL)
Synonyms (14)
GRAMENE GENEGR:0200489
Type Gene
Species Zea mays subsp. mays (Maize) [ GR_tax:014546 ]
Germplasm
Description Endosperm collapses during drying stage at maturity, giving a smooth
indentation of crown and/or the sides of the kernel. The Sh1 encoded sucrose
synthase-1 (SS1; SUS1) enzyme is missing in the mutant endosperm and other
plant parts. The mutant phenotype of the kernel is due to reduced level of
starch and early cell degeneration in the developing endosperm. Ethyl methanesulfonate-
induced mutants show interallelic complementation (Chourey and Nelson 1979
Genetics 91:317). Subunits of the SS1 protein co-polymerize with sucrose synthase-
2 (SS2; SUS2) isozyme, encoded by the sus2 locus, in a tissue-specific fashion
(Chourey et al. 1986 Molec Gen Genet 203:251). A molecularly characterized
clone is available (Werr et al. 1985 Embo J. 4:1373). Germination of shrunken
kernels may be poor under field conditions. Seedlings somewhat retarded in
early stages, plants normal after establishment. (P. Chourey). p-p246A was used
to probe umc217(sh1). bnl#(sh1)(Pst38 or Pvu55), npi15(sh1)().
Posttranscriptional up-regulation in sus1 mutant tissues (Chourey 1994).
Inflated endosperm collapses on drying, forming smoothly indented kernels;
sucrose synthase-1 of endosperm (compare sus2); homotetramer; SSRs phi028, 044,
033. 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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