Plant Molecular Biology

, Volume 41, Issue 1, pp 57-63

First online:

Localization of peroxidase mRNAs in soybean seeds by in situ hybridization

  • Mark GijzenAffiliated withSouthern Crop Protection and Food Research Centre
  • , S. Shea MillerAffiliated withEastern Cereals and Oilseeds Research Centre
  • , Lu-Ann BowmanAffiliated withEastern Cereals and Oilseeds Research Centre
  • , Anthea K. BatchelorAffiliated withEastern Cereals and Oilseeds Research Centre
  • , Kim BoutilierAffiliated withEastern Cereals and Oilseeds Research Centre
  • , Brian L.A. MikiAffiliated withEastern Cereals and Oilseeds Research Centre

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The soybean Ep gene encodes an anionic peroxidase enzyme that accumulates in large amounts in seed coat tissues. We have isolated a second peroxidase gene, Prx2, that is also highly expressed in developing seed coat tissues. Sequence analysis of Prx2 cDNA indicates that this transcript encodes a cationic peroxidase isozyme that is far removed from Ep in peroxidase phylogeny. To determine the expression patterns for these two peroxidases in developing seeds, the abundance and localization of the Ep and Prx2 transcripts were compared by in situ hybridization. Results show the expression of Ep begins in a small number of cells flanking the vascular bundle in the seed coat, spreads to encircle the seed, and then migrates to the hourglass cells as they develop. Expression of Prx2 occurs throughout development in all cell layers of the seed coat, and is also evident in the pericarp and embryo. Nonetheless, the Ep-encoded enzyme accounts for virtually all of the peroxidase activity detected in mature seed coats. The Prx2 enzyme is either insoluble in a catalytically inactive form, or is subject to degradation during seed maturation.

embryo gene expression Glycine max oxidoreductase seed coat testa