,A Dialogue between the Sirène Pathway in Synergids and the Fertilization Independent Seed Pathway i

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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/SIRENE 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.Alteatively,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 controI of pollen tube discharge.This mutant also produces autonomous endosperm development in absence of tertilization-a trait associated with the FERTILIZATION INDEPENDENT SEED (FIS) mutant class.This led us to identify autonomous endosperm in s mutants and to demonstrate synergistic interactions between s and the fis mutants.In addition,the fis mutants display defects in pollen tube discharge as in s 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.
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