Pollen Tube Attraction by the Synergid Cell

Author:

Higashiyama Tetsuya1,Yabe Shizu1,Sasaki Narie2,Nishimura Yoshiki1,Miyagishima Shin-ya1,Kuroiwa Haruko1,Kuroiwa Tsuneyoshi1

Affiliation:

1. Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113–0033, Japan.

2. Department of Biology, Ochanomizu University, Tokyo 112–8610, Japan.

Abstract

In flowering plants, guidance of the pollen tube to the embryo sac (the haploid female gametophyte) is critical for successful fertilization. The target embryo sac may attract the pollen tube as the final step of guidance in the pistil. We show by laser cell ablation that two synergid cells adjacent to the egg cell attract the pollen tube. A single synergid cell was sufficient to generate an attraction signal, and two cells enhanced it. After fertilization, the embryo sac no longer attracts the pollen tube, despite the persistence of one synergid cell. This cessation of attraction might be involved in blocking polyspermy.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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