The effect of solar irradiance on the mortality of Phakopsora pachyrhizi urediniospores

S. A. Isard, N. S. Dufault, M. R. Miles, G. L. Hartman, J. M. Russo, E. D. De Wolf, W. Morel

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Soybean rust, caused by Phakopsora pachyrhizi, may be the most important foliar disease of soybean. Within the last 10 years, the fungus has moved to many new geographical locations via spread of airborne urediniospores. The objective of this study was to determine the relationship between urediniospore viability and exposure to solar radiation. Urediniospores of P. pachyrhizi were exposed in Capitán Miranda, Paraguay, to determine the deleterious effects of sunlight. Concomitant total solar (0.285 to 2.8 μm) and ultraviolet (0.295 to 0.385 μm) irradiance measurements were used to predict urediniospore germination. Urediniospores exposed to doses of solar and ultraviolet (UV) radiation ≥27.3 MJ/m2 and ≥1.2 MJ/m 2, respectively, did not germinate. The proportions of urediniospores that germinated, normalized with respect to the germination proportion for unexposed urediniospores from the same collections, were a linear function of solar irradiance (R2 = 0.83). UV measurements predicted normalized germination proportions equally well. Results of inoculation experiments with exposed P. pachyrhizi urediniospores supported the results of the germination trials, although the effects of moderate levels of irradiance varied. The relationship between urediniospore viability and exposure to solar radiation has been incorporated into the U.S. Department of Agriculture's soybean rust acrobiological model that provides North American soybean growers with decision support for managing soybean rust.

Original languageEnglish (US)
Pages (from-to)941-945
Number of pages5
JournalPlant disease
Volume90
Issue number7
DOIs
StatePublished - Jul 1 2006

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Phakopsora pachyrhizi
solar radiation
soybean rust
germination
viability
soybeans
urediniospores
Paraguay
foliar diseases
Geographical Locations
USDA
ultraviolet radiation
light intensity
growers

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science

Cite this

Isard, S. A., Dufault, N. S., Miles, M. R., Hartman, G. L., Russo, J. M., De Wolf, E. D., & Morel, W. (2006). The effect of solar irradiance on the mortality of Phakopsora pachyrhizi urediniospores. Plant disease, 90(7), 941-945. https://doi.org/10.1094/PD-90-0941
Isard, S. A. ; Dufault, N. S. ; Miles, M. R. ; Hartman, G. L. ; Russo, J. M. ; De Wolf, E. D. ; Morel, W. / The effect of solar irradiance on the mortality of Phakopsora pachyrhizi urediniospores. In: Plant disease. 2006 ; Vol. 90, No. 7. pp. 941-945.
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Isard, SA, Dufault, NS, Miles, MR, Hartman, GL, Russo, JM, De Wolf, ED & Morel, W 2006, 'The effect of solar irradiance on the mortality of Phakopsora pachyrhizi urediniospores', Plant disease, vol. 90, no. 7, pp. 941-945. https://doi.org/10.1094/PD-90-0941

The effect of solar irradiance on the mortality of Phakopsora pachyrhizi urediniospores. / Isard, S. A.; Dufault, N. S.; Miles, M. R.; Hartman, G. L.; Russo, J. M.; De Wolf, E. D.; Morel, W.

In: Plant disease, Vol. 90, No. 7, 01.07.2006, p. 941-945.

Research output: Contribution to journalArticle

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AU - Isard, S. A.

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