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Variation in resistance to Verticillium wilt within seedling populations of some varieties of lucerne ( Medicago sativa )
Author(s) -
LATUNDEDADA A. O.,
LUCAS J. A.
Publication year - 1982
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1982.tb02826.x
Subject(s) - biology , verticillium wilt , seedling , verticillium , wilt disease , plant disease resistance , shoot , medicago sativa , fungus , resistance (ecology) , agronomy , germplasm , botany , horticulture , biochemistry , gene
Verticillium wilt was assessed in seedling populations of five lucerne varieties: Euver, Maris Kabul, Sabilt, Verneuil and Vertus. Visual assessments of disease severity in Vertus were compared with estimates of fungal biomass obtained by a maceration‐dilution plate method and glucosamine assays. Symptom severity correlated with the amounts of fungus present only at the lower disease ratings. In contrast, direct correlations were obtained between visually assessed disease severities and the chlorophyll contents of plant shoots. Wide variation in disease reaction type were found within populations of all five varieties and disease development was found to differ in two environments with differing temperatures. The significance of these variations is discussed in relation to the genetic background of the host and studies on the biochemical basis of resistance to Verticillium wilt.