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Area Under the Disease Progress Curve: Its Reliability as a Measure of Slow‐Rusting Resistance
Author(s) -
Singh H.,
Rao M. V.
Publication year - 1989
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1989.tb00392.x
Subject(s) - biology , puccinia recondita , value (mathematics) , plant disease resistance , statistics , resistance (ecology) , rust (programming language) , measure (data warehouse) , mathematics , agronomy , poaceae , genetics , computer science , database , gene , programming language
Differences between the area under the disease progress curve (A‐value) and the rate of disease development (r‐value), the two commonly used measures of slow‐rusting resistance, are discussed with the help of theoretical models. A study on development of leaf rust ( Puccinia recondita f. sp. tritici ) in two sets of breeding lines of wheat ( Triticum aestivum L.) showed that the A‐value and the r‐value (calculated as slope of the regression line of disease progress data) are not necessarily correlated and that the initial inoculum level can have a large effect on the A‐value. These studies suggested that the A‐value and the r‐value measure different aspects of resistance and they should, therefore, be used with greater discrimination.