Aeciospore ejection in the rust pathogen Puccinia graminis is driven by moisture ingress

Bueno-Sancho, Vanessa, Orton, Elizabeth S., Gerrity, Morgan, Lewis, Clare M., Davey, Phoebe, Findlay, Kim C., Barclay, Elaine, Robinson, Phil, Morris, Richard J., Blyth, Mark and Saunders, Diane G. O. (2021) Aeciospore ejection in the rust pathogen Puccinia graminis is driven by moisture ingress. Communications Biology, 4. ISSN 2399-3642

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Abstract

Fungi have evolved an array of spore discharge and dispersal processes. Here, we developed a theoretical model that explains the ejection mechanics of aeciospore liberation in the stem rust pathogen Puccinia graminis. Aeciospores are released from cluster cups formed on its Berberis host, spreading early-season inoculum into neighboring small-grain crops. Our model illustrates that during dew or rainfall, changes in aeciospore turgidity exerts substantial force on neighboring aeciospores in cluster cups whilst gaps between spores become perfused with water. This perfusion coats aeciospores with a lubrication film that facilitates expulsion, with single aeciospores reaching speeds of 0.053 to 0.754 m·s−1. We also used aeciospore source strength estimates to simulate the aeciospore dispersal gradient and incorporated this into a publicly available web interface. This aids farmers and legislators to assess current local risk of dispersal and facilitates development of sophisticated epidemiological models to potentially curtail stem rust epidemics originating on Berberis.

Item Type: Article
Uncontrolled Keywords: agricultural and biological sciences(all),biochemistry, genetics and molecular biology(all),medicine (miscellaneous),sdg 3 - good health and well-being ,/dk/atira/pure/subjectarea/asjc/1100
Faculty \ School: Faculty of Science > School of Biological Sciences

Faculty of Science > School of Mathematics
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Depositing User: LivePure Connector
Date Deposited: 23 Oct 2021 00:41
Last Modified: 10 Nov 2021 08:13
URI: https://ueaeprints.uea.ac.uk/id/eprint/81869
DOI: 10.1038/s42003-021-02747-1

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