Hydrothermal time models for conidial germination and mycelial growth of the seed pathogen Pyrenophora semeniperda. Issue 8 (August 2015)

• Record Type: Journal Article
• Authors: Barth, Connor W.; Meyer, Susan E.; Beckstead, Julie; Allen, Phil S.
• Is Part Of: Fungal biology. Volume 119:Issue 8(2015:Aug.)
• Page Start: 720
• Page End: 730
• Publication Date: 2015-08
• Subjects: Mycology -- Periodicals; Fungi -- Periodicals; 579.505
• DOI: 10.1016/j.funbio.2015.04.004
• Languages: English
• ISSNs: 1878-6146

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010a">Abstract</title> <sec> <p id="abspara0010">Population-based threshold models using hydrothermal time (HTT) have been widely used to model seed germination. We used HTT to model conidial germination and mycelial growth for the seed pathogen <italic>Pyrenophora semeniperda</italic> in a novel approach to understanding its interactions with host seeds. Germination time courses and mycelial growth rates for <italic>P.semeniperda</italic> were measured on PDA amended to achieve a series of five water potentials (ca. 0 to −6 MPa) at six constant temperatures (5–30 °C). Conidial germination was described with alternative population-based models using constant or variable base and maximum temperature and water potential parameters. Mycelial growth was modeled as a continuous, linear process with constant base temperature and base water potential. Models based on HTT showed reasonable fit to germination and growth rate data sets. The best-fit conidial germination model (R² = 0.859) was based on variable base and maximum temperature as a function of water potential. The good fit of the linear mycelial growth model (R² = 0.916) demonstrated the utility of HTT for modeling continuous as well as population-based processes. HTT modeling may be a useful approach to the quantification of germination and growth processes in a wide range of filamentous fungi.</p> </sec> </abstract>