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Leaf growth characteristics of Vitis vinifera and prediction of final lamina length for studies of powdery mildew
journal contribution
posted on 2023-05-17, 09:26 authored by Lee, G, Katherine EvansKatherine Evans, Smith, AngelaTotal 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 85.3–97.9% of predicted final lamina length.
Funding
Wine Australia
History
Publication title
Annals of Applied BiologyVolume
161Pagination
132-139ISSN
0003-4746Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
Wiley-Blackwell Publishing LtdPlace of publication
United KingdomRights statement
Copyright 2012 Antarctic Climate & Ecosystems Cooperative Research CentreRepository Status
- Restricted