The role of the integuments in pollen tube guidance in flowering plants

The New Phytologist
Jorge LoraJose I Hormaza

Abstract

In angiosperms, pollen tube entry into the ovule generally takes place through the micropyle, but the exact role of the micropyle in pollen tube guidance remains unclear. A limited number of studies have examined eudicots with bitegmic micropyles, but information is lacking in ovules of basal/early-divergent angiosperms with unitegmic micropyles. We have evaluated the role of the micropyle in pollen tube guidance in an early-divergent angiosperm (Annona cherimola) and the evolutionarily derived Arabidopsis thaliana by studying γ-aminobutyric acid (GABA) and arabinogalactan proteins (AGPs) in wild-type plants and integument-defective mutants. A conserved inhibitory role of GABA in pollen tube growth was shown in A. cherimola, in which AGPs surround the egg apparatus. In Arabidopsis, the micropyle formed only by the outer integument in wuschel-7 mutants caused a partial defect in pollen tube guidance. Moreover, pollen tubes were not observed in the micropyle of an inner no outer (ino) mutant in Arabidopsis, but were observed in homologous ino mutants in Annona. The similar distribution of GABA and AGPs observed in the micropyle of Arabidopsis and Annona, together with the anomalies from specific integument mutants, support the ro...Continue Reading

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Citations

Mar 2, 2019·Journal of Experimental Botany·Ana Lúcia LopesSílvia Coimbra
May 3, 2019·Plant Reproduction·Juan M Losada, María Herrero
Jan 13, 2021·Biological Reviews of the Cambridge Philosophical Society·Paula J Rudall
Mar 2, 2021·Frontiers in Plant Science·Jorge LoraJose I Hormaza
Apr 17, 2021·Plant Reproduction·Cecilia Monserrat Lara-Mondragón, Cora A MacAlister
Jun 3, 2021·International Journal of Molecular Sciences·Bartosz Jan PłachnoAnna Bogucka-Kocka
Aug 8, 2021·International Journal of Molecular Sciences·Joanna RojekMałgorzata Gutkowska

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