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Micropylar Pollen Tube Guidance by Egg Apparatus 1 of Maize
Mihaela L. Márton,1
Simone Cordts,1
Jean Broadhvest,2
Thomas Dresselhaus1*
Abstract:
Pollen tube guidance precedes the double fertilization of floweringplants. Here, we report the identification of a small maizeprotein of 94 amino acids involved in short-range signalingrequired for pollen tube attraction by the female gametophyte.ZmEA1 is exclusively expressed in the egg apparatus, consistingof the egg cell and two synergids. Chimeric ZmEA1 fused to greenfluorescent protein (ZmEA1:GFP) was first visible within thefiliform apparatus and later was localized to nucellar cellwalls below the micropylar opening of the ovule. Transgenicdown-regulation of the ZmEA1 gene led to ovule sterility causedby loss of close-range pollen tube guidance to the micropyle.
1 Biocenter Klein Flottbek, Developmental Biology and Biotechnology, University of Hamburg, Ohnhorststrasse 18, D-22609 Hamburg, Germany. 2 Bayer BioScience N.V., Technologiepark 38, B-9052 Ghent, Belgium.
* To whom correspondence should be addressed. E-mail: dresselh{at}botanik.uni-hamburg.de
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