ArticlePlant molecular biology2002
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.
Article in Plant molecular biology, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 14 citations in OpenAlex.
- ZmDRR206 Regulates Nutrient Accumulation in Endosperm through Its Role in Cell Wall Biogenesis during Maize Kernel Development.International journal of molecular sciences · 2023Article
- ZmCTLP1 is required for the maintenance of lipid homeostasis and the basal endosperm transfer layer in maize kernels.The New phytologist · 2021Article
- Development and function of caryopsis transport tissues in maize, sorghum and wheat.Plant cell reports · 2014Review
- A protective role for the embryo surrounding region of the maize endosperm, as evidenced by the characterisation of ZmESR-6, a defensin gene specifically expressed in this region.Plant molecular biology · 2005Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
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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