Qualitative and quantitative assessments of the reaction of lucerne plants to verticillium wilt

A glasshouse assessment of reaction of lucerne (Medicaga sativa L.) plants to infection (wilt score) with Verticillium albo-atrum Reinke et Berthold was influenced by the particular combination of fungus isolate and host cultivar. Within any particular cultivar an increase in wilt score was associat...

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Veröffentlicht in:New Zealand journal of agricultural research 1987-01, Vol.30 (3), p.349-359
1. Verfasser: Hawthorne, B. T.
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description A glasshouse assessment of reaction of lucerne (Medicaga sativa L.) plants to infection (wilt score) with Verticillium albo-atrum Reinke et Berthold was influenced by the particular combination of fungus isolate and host cultivar. Within any particular cultivar an increase in wilt score was associated with increased depression of growth when plants were inoculated with strongly pathogenic isolates but not with weakly or moderately pathogenic isolates. For plants inoculated with a strongly pathogenic isolate, growth of symptomless or slightly affected plants was reduced to as little as 26% of that of uninoculated plants with a cultivar of low resistance such as 'Rere' and to between 77 and 93% for plants of 'Vertus' which has good resistance to wilt. Scoring plant reaction on the basis of visual symptoms, for the purpose of screening for resistance, was generally as good as using quantitative growth assessments and offered the advantages of speed and leaving the plants intact. Factors which must be controlled to achieve reliable screening include light, temperature, pathogenicity of the fungus, and time of assessment. Relative reaction of lucerne cultivars to wilt was generally consistent and it was possible to distinguish three groups of cultivars: (1) 'Vertus' - good resistance; (2) 'Pioneer 524', 'Wairau', 'WL311', and 'WL318' - slight to moderate resistance; and (3) 'AS13R', 'Rere', 'Saranac', and 'Washoe' - low to slight resistance.
doi_str_mv 10.1080/00288233.1987.10421895
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T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Qualitative and quantitative assessments of the reaction of lucerne plants to verticillium wilt</atitle><jtitle>New Zealand journal of agricultural research</jtitle><date>1987-01-01</date><risdate>1987</risdate><volume>30</volume><issue>3</issue><spage>349</spage><epage>359</epage><pages>349-359</pages><issn>0028-8233</issn><eissn>1175-8775</eissn><coden>NEZFA7</coden><abstract>A glasshouse assessment of reaction of lucerne (Medicaga sativa L.) plants to infection (wilt score) with Verticillium albo-atrum Reinke et Berthold was influenced by the particular combination of fungus isolate and host cultivar. Within any particular cultivar an increase in wilt score was associated with increased depression of growth when plants were inoculated with strongly pathogenic isolates but not with weakly or moderately pathogenic isolates. For plants inoculated with a strongly pathogenic isolate, growth of symptomless or slightly affected plants was reduced to as little as 26% of that of uninoculated plants with a cultivar of low resistance such as 'Rere' and to between 77 and 93% for plants of 'Vertus' which has good resistance to wilt. Scoring plant reaction on the basis of visual symptoms, for the purpose of screening for resistance, was generally as good as using quantitative growth assessments and offered the advantages of speed and leaving the plants intact. Factors which must be controlled to achieve reliable screening include light, temperature, pathogenicity of the fungus, and time of assessment. 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source Royal Society of New Zealand Open Access Journals; EZB-FREE-00999 freely available EZB journals; Periodicals Index Online
subjects Agronomy. Soil science and plant productions
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Generalities
Genetics and breeding of economic plants
lucerne
Medicago sativa
Pest resistance
resistance
screening for resistance
Varietal selection. Specialized plant breeding, plant breeding aims
Verticillium albo-atrum
title Qualitative and quantitative assessments of the reaction of lucerne plants to verticillium wilt
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