Biology Reference
In-Depth Information
Distinct Short-Range Ovule
signals attract or Repel
Arabidopsis Thaliana Pollen
Tubes in Vitro
Ravishankar Palanivelu and Daphne Preuss
abstRact
Background
Pollen tubes deliver sperm after navigating through flower tissues in response
to attractive and repulsive cues. Genetic analyses in maize and Arabidopsis
thaliana and cell ablation studies in Torenia fournieri have shown that the
female gametophyte (the 7-celled haploid embryo sac within an ovule) and
surrounding diploid tissues are essential for guiding pollen tubes to ovules.
The variety and inaccessibility of these cells and tissues has made it challeng-
ing to characterize the sources of guidance signals and the dynamic responses
they elicit in the pollen tubes.
 
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