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Coincidence of maximum severity of powdery mildew on grape leaves and the carbohydrate sink-to-source transition
Citation
Merry, AM and Evans, KJ and Corkrey, R and Wilson, SJ, Coincidence of maximum severity of powdery mildew on grape leaves and the carbohydrate sink-to-source transition, Plant Pathology, 62, (4) pp. 842-850. ISSN 0032-0862 (2013) [Refereed Article]
Copyright Statement
Copyright 2012 University of Tasmania
DOI: doi:10.1111/j.1365-3059.2012.02691.x
Abstract
Grapevine leaves infected with powdery mildew are a source of inoculum for fruit infection. Leaves emerging on a single
primary shoot of Vitis vinifera cv. Cabernet Sauvignon were exposed to average glasshouse temperatures of 18°C
(023 leaves emerging/day) or 25°C (054 leaves emerging/day). All leaves on 8–10 shoots with approximately 20 leaves
each were inoculated with Erysiphe necator conidia to assess disease severity after 14 days in the 25°C glasshouse.
Two photosynthetic ‘source’ leaves per shoot on the remaining 8–10 shoots were treated with 14CO2 to identify, by
autoradiography, the leaf position completing the carbohydrate sink-to-source transition. There was a clear association
between the mean modal leaf position for maximum severity of powdery mildew (position 37 for 18°C; position 44
for 25°C) and the mean position of the leaf completing the sink-to-source transition (position 38 for 18°C; position
47 for 25°C). The mean modal leaf position for the maximum percentage of conidia germinating to form secondary
hyphae was 42 for additional plants grown in the 25°C glasshouse. A higher rate of leaf emergence resulted in a
greater proportion of diseased leaves per shoot. A Bayesian model, consisting of component models for disease severity
and leaf ontogenic resistance, had parameters representing the rate and magnitude of pathogen colonization that differed
for shoots developing in different preinoculation environments. The results support the hypothesis that the population
of leaves in a vineyard
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | biotroph, host growth, host–pathogen interaction, Uncinula necator, viticulture |
| Research Division: | Agricultural and Veterinary Sciences |
| Research Group: | Horticultural Production |
| Research Field: | Oenology and Viticulture |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Horticultural Crops |
| Objective Field: | Table Grapes |
| UTAS Author: | Merry, AM (Dr Angela Merry) |
| UTAS Author: | Evans, KJ (Dr Katherine Evans) |
| UTAS Author: | Corkrey, R (Dr Ross Corkrey) |
| UTAS Author: | Wilson, SJ (Dr Stephen Wilson) |
| ID Code: | 78707 |
| Year Published: | 2013 (online first 2012) |
| Web of Science® Times Cited: | 7 |
| Deposited By: | Agricultural Science |
| Deposited On: | 2012-07-22 |
| Last Modified: | 2017-11-06 |
| Downloads: | 0 |
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