Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
XB-ART-9411
Plant Mol Biol 2001 Jan 01;451:51-62. doi: 10.1023/a:1006428007826.
Show Gene links Show Anatomy links

The brassica MIP-MOD gene encodes a functional water channel that is expressed in the stigma epidermis.

Dixit R , Rizzo C , Nasrallah M , Nasrallah J .


???displayArticle.abstract???
In crucifers, the ability of the stigma to differentially modulate hydration of pollen grains, depending on whether the pollen is recognized to be compatible or incompatible, represents a crucial stage in pollination. Our recent analysis of the mod mutation of Brassica, which results in a breakdown of the self-incompatibility response, led to the isolation of a gene linked to the MOD locus which is expressed at low levels in mod mutants. The gene is predicted to encode a plasma membrane-localized aquaporin-like protein and has been designated MIP-MOD. We utilized reporter gene analysis to demonstrate that the MIP-MOD promoter is active in Brassica papillar cells as well as in some vegetative tissues. The encoded protein is also likely to be plasma membrane-localized based on the observation that all plasma membrane-intrinsic aquaporin-like proteins in Brassica leaves are enriched in plasma membrane fractions. The MIP-MOD protein results in a low but measurable enhancement in osmotic water permeability of Xenopus oocytes and hence represents a functional aquaporin. The results are consistent with the notion that MIP-MOD is involved in the regulation of water transport across the stigma epidermal cell membrane.

???displayArticle.pubmedLink??? 11247606
???displayArticle.link??? Plant Mol Biol


Species referenced: Xenopus
Genes referenced: mip

References [+] :
Barrieu, High expression of the tonoplast aquaporin ZmTIP1 in epidermal and conducting tissues of maize. 1998, Pubmed