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  Post-phloem protein trafficking in the maize caryopsis: ZmTRXh1, a thioredoxin specifically expressed in the pedicel parenchyma of Zea mays L., is found predominantly in the placentochalaza

Santandrea, G., Guo, Y., O'Connell, T., & Thompson, R. D. (2002). Post-phloem protein trafficking in the maize caryopsis: ZmTRXh1, a thioredoxin specifically expressed in the pedicel parenchyma of Zea mays L., is found predominantly in the placentochalaza. Plant Molecular Biology, 50(4), 743-756.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-3D52-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-3D53-C
Genre: Journal Article

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 Creators:
Santandrea, G., Author
Guo, Y., Author
O'Connell, T., Author
Thompson, R. D.1, Author              
Affiliations:
1Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society, ou_1113570              

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Free keywords: endosperm; maize; pedicel; phloem; solute; thioredoxin
 Abstract: The pedicel of the maize (Zea mays L.) caryopsis is a complex structure consisting of layers of specialized cell-types involved with solute transfer into the developing kernel. A molecular marker for one of these cell layers, the phloem parenchyma, has been obtained by differential screening of a cDNA library from 7 days after pollination (DAP) kernels. The clone encodes a novel processed type of thioredoxin, ZmTRXh1, with a variant active site sequence. The transcript is exclusively present in phloem parenchyma cells of the pedicel. The protein accumulates predominantly in the adjacent placentochalazal layer up to 21 DAP, declining thereafter until, at 31 DAP, only traces remain. ZmTRXh1, which is catalytically active, is present in the cytosol, and is restricted to a fraction of the placentochalazal cells at 12 DAP, where it accumulates to high levels. ZmTRXh1 represents the first example of post-phloem protein trafficking in the pedicel. The reasons for this transfer and possible functions for the protein in the placentochalaza are discussed.

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Language(s): eng - English
 Dates: 2002-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 28789
ISI: 000177679200013
 Degree: -

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Title: Plant Molecular Biology
  Alternative Title : Plant Mol.Biol.
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 50 (4) Sequence Number: - Start / End Page: 743 - 756 Identifier: ISSN: 0167-4412