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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1986 Dec;83(23):9099–9103. doi: 10.1073/pnas.83.23.9099

The cloning, genetic mapping, and expression of the constitutive sucrose synthase locus of maize

Donald R McCarty 1, Janine R Shaw 1, L Curtis Hannah 1
PMCID: PMC387082  PMID: 16593784

Abstract

Two differentially expressed genes encode isoenzymes of sucrose synthase in Zea mays. A clone of the shrunken 1 (Sh1) locus, the structural gene for the major endosperm form of sucrose synthase, was used to isolate a genomic clone of constitutive sucrose synthase (Css), the structural gene for the isoenzyme expressed in embryo and other tissues. The Css clone was positively identified by RNA blot analysis of RNA from wild type and a sh1 deletion stock and by analysis of the in vitro translation product of hybrid-selected mRNA. Southern blot analysis of DNA from monosomic plants derived from an r-x1 stock, coupled with restriction fragment length polymorphism mapping, placed the Css gene 32 map units from Sh1 on chromosome 9. In seedling tissues, Css mRNA is present at higher levels than Sh1 mRNA. Expression of both Sh1 and Css in root tissue is enhanced by anaerobic conditions, although Css is induced to a lesser extent than is Sh1. Thus, Css appears to be expressed constitutively, whereas Sh1 is expressed at high levels only in response to specific developmental and environmental stimuli.

Keywords: duplicate loci, sugar metabolism, anaerobic induction, monosomics, gene mapping

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Selected References

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