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Leaf growth characteristics of Vitis vinifera and prediction of final lamina length for studies of powdery mildew


Lee, G and Evans, KJ and Smith, Angela, Leaf growth characteristics of Vitis vinifera and prediction of final lamina length for studies of powdery mildew, Annals of Applied Biology, 161, (2) pp. 132-139. ISSN 0003-4746 (2012) [Refereed Article]

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Copyright Statement

Copyright 2012 Antarctic Climate & Ecosystems Cooperative Research Centre

DOI: doi:10.1111/j.1744-7348.2012.00557.x


Total functional leaf area is a key factor in determining crop yield. A nonlinear mixed-effects model was employed to estimate growth responses for individual leaves using repeated measures of lamina length ≥30mm, in the absence of disease. Resulting growth curves make allowances for, and allow assessment of, leaf to leaf variability. The major source of variability in leaf growth was identified as differences in thermal time required to reach half final lamina length. Juvenile leaves of Vitis vinifera are susceptible to infection by powdery mildew (Erysiphe necator) which impairs leaf function. The model was used to predict unobserved final lamina length for a subset of leaves inoculated with E. necator immediately after observations ceased. The severity of infection by E. necator varies among infected leaves. A previous study identified which of the inoculated leaves developed symptoms of severe powdery mildew. Maximum severity of infection was found to occur when individual leaves were at 85.397.9% of predicted final lamina length.

Item Details

Item Type:Refereed Article
Keywords:Erysiphe necator, growth model, lamina length, leaf area, mixed-effects, nonlinear, powdery mildew, Vitis vinifera
Research Division:Mathematical Sciences
Research Group:Statistics
Research Field:Applied statistics
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial crops
Objective Field:Wine grapes
UTAS Author:Lee, G (Dr Greg Lee)
UTAS Author:Evans, KJ (Associate Professor Katherine Evans)
UTAS Author:Smith, Angela (Dr Angela Merry)
ID Code:74622
Year Published:2012
Web of Science® Times Cited:1
Deposited By:Agricultural Science
Deposited On:2011-12-08
Last Modified:2015-01-27

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