Plant Molecular Biology

, Volume 30, Issue 6, pp 1223–1232

Evolutionary conservation and expression patterns of maize starch branching enzyme I and IIb genes suggests isoform specialization

  • Ming Gao
  • Dane K. Fisher
  • Kyung-Nam Kim
  • Jack C. Shannon
  • Mark J. Guiltinan
Research Article

Abstract

Expression of the maize (Zea mays L.) starch branching enzyme (SBE) genes Sbe1 and Sbe2 were characterized during kernel development and in vegetative tissues. The onset of Sbe1 and Sbe2 expression during endosperm development was similar to that of other genes involved in starch biosynthesis (Wx, Sh2 and Bt2). However, the expression of Sbe2 peaked earlier than that of Sbe1 in developing endosperm and embryos resulting in a shift in the ratio of Sbe1 to Sbe2 relative message levels during kernel and embryo development. Transcripts hybridizing to the Sbe2 probe were not detectable in leaves or roots which nonetheless have SBEII enzymatic activity, suggesting that there may be another divergent SBEII-like gene(s) in maize. A similar expression pattern is shared between the maize genes and related genes in pea, which together with their evolutionary conservation, suggests that the SBE isoforms may play unique roles in starch biosynthesis during plant development.

Key words

gene evolution gene expression Zea mays L. starch biosynthesis starch branching enzyme 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Ming Gao
    • 1
  • Dane K. Fisher
    • 1
  • Kyung-Nam Kim
    • 1
  • Jack C. Shannon
    • 1
  • Mark J. Guiltinan
    • 1
  1. 1.Department of HorticultureIntercollege Graduate Programs in Plant Physiology and Genetics and The Biotechnology InstituteUniversity ParkUSA
  2. 2.519 Wartik Laboratory, The Biotechnology InstitutePennsylvania State UniversityUniversity ParkUSA

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