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Molecular Plant Advance Access published online on May 16, 2008
Molecular Plant, doi:10.1093/mp/ssn023
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© The Author 2008. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

A Dialogue between the Sirène Pathway in Synergids and the Fertilization Independent Seed Pathway in the Central Cell Controls Male Gamete Release during Double Fertilization in Arabidopsis

Nicolas Rotmana,b,2, Mathieu Gourguesa,c,2, Anne-Elisabeth Guittona, Jean-Emmanuel Faurea,d and Frédéric Bergera,e,1

a Ecole normale supérieure de Lyon, Unité Mixte de Recherches 5667 Reproduction et développement des plantes, 46 allée d'Italie, 69007 Lyon cedex 07, France
b Centre for Integrative Genomics, University of Lausanne, Le Génopode, 1015 Lausanne, Switzerland
c Unite Mixte de Recherches IPMSV, CNRS/INRA/Unice, 400 route des chappes, Sophia Antipolis F-06903, France
d European Commission, Research Directorate General, Research Infrastructures (Unit B3), Office SDME 1/133, B-1049 Brussels, Belgium
e Temasek Life Sciences Laboratory, 1 Research link, National University of Singapore, Singapore 117604

1 To whom correspondence should be addressed. E-mail fred{at}tll.org.sg.

Angiosperms sexual reproduction involves interactions between the two female gametes in the embryo sac and the two male gametes released by the pollen tube. The two synergids of the embryo sac express the FERONIA/SIRÈNE receptor-like kinase, which controls the discharge of the two sperm cells from the pollen tube. FER/SRN may respond to a ligand from the pollen tube. Alternatively, the interaction between FER/SRN and a ligand from the embryo sac may lead to a state of competence of the synergids allowing pollen tube discharge. Here, we report the new mutant scylla (syl) impaired in the control of pollen tube discharge. This mutant also produces autonomous endosperm development in absence of fertilization—a trait associated with the FERTILIZATION INDEPENDENT SEED (FIS) mutant class. This led us to identify autonomous endosperm in srn mutants and to demonstrate synergistic interactions between srn and the fis mutants. In addition, the fis mutants display defects in pollen tube discharge as in srn and syl mutants, confirming the interaction between the two pathways. Our findings suggest that pollen tube discharge is controlled by an interaction between the synergids expressing SRN/FER and the central cell expressing FIS genes.

2 These authors contributed equally to this manuscript.


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