Articles
INFLUENCE OF SOIL TEMPERATURE TO THE PATHOSYSTEM STRAWBERRY-VERTICILLIUM
Article number
838_23
Pages
139 – 144
Language
English
Abstract
In previous trials we found Verticillium dahliae genotypes in wilted plants of strawberry cv. Elsanta as well as in vital plants.
The results of climate chamber trails showed that Verticillium wilt of strawberry is affected by enhanced temperature.
Simulating the weather conditions of the extreme year 2004 resulted in an increase of damage under the warm conditions.
The majority of the 21 Verticillium genotypes used became virulent under warm conditions.
In contrast, only two genotypes were virulent at standard conditions.
Vitality of a plant was a result of colonization with an avirulent Verticillium genotype or of an adequate plant reaction against the virulent fungus.
Increase of osmolality in leafs is an unspecific plant reaction to stress and to infection by pathogens.
Level of plant reaction to Verticillium genotypes was similar under standard and warm conditions.
At standard conditions, five of 18 Verticillium genotypes were recognised by the plant, resulting in an increased osmolality and adequate control of the fungus.
Plants did not recognize the remaining 13 genotypes.
These genotypes can be divided in two subgroups: enhanced plant vitality reveals the fungal genotype to be avirulent; and wilting of the plant is the reaction to virulent fungal genotypes.
Under warm conditions, genotypes that were not recognised by the plant are virulent with the exception of one genotype, which became avirulent under warm conditions.
Defence reaction of Elsanta is not adequate to control fungi under warm conditions.
Combinations of genotypes used as inoculums resulted in two reaction schemes.
Under warm conditions, the combination of genotypes, which are detected by the plant, can stimulate the reaction of the plant, preventing wilting damage.
Genotypes, which are not detected by the plant, but which are avirulent per se, will induce no damage but can fill the ecological gap for Verticillium and prevent the plant from colonization with virulent genotypes.
The results of climate chamber trails showed that Verticillium wilt of strawberry is affected by enhanced temperature.
Simulating the weather conditions of the extreme year 2004 resulted in an increase of damage under the warm conditions.
The majority of the 21 Verticillium genotypes used became virulent under warm conditions.
In contrast, only two genotypes were virulent at standard conditions.
Vitality of a plant was a result of colonization with an avirulent Verticillium genotype or of an adequate plant reaction against the virulent fungus.
Increase of osmolality in leafs is an unspecific plant reaction to stress and to infection by pathogens.
Level of plant reaction to Verticillium genotypes was similar under standard and warm conditions.
At standard conditions, five of 18 Verticillium genotypes were recognised by the plant, resulting in an increased osmolality and adequate control of the fungus.
Plants did not recognize the remaining 13 genotypes.
These genotypes can be divided in two subgroups: enhanced plant vitality reveals the fungal genotype to be avirulent; and wilting of the plant is the reaction to virulent fungal genotypes.
Under warm conditions, genotypes that were not recognised by the plant are virulent with the exception of one genotype, which became avirulent under warm conditions.
Defence reaction of Elsanta is not adequate to control fungi under warm conditions.
Combinations of genotypes used as inoculums resulted in two reaction schemes.
Under warm conditions, the combination of genotypes, which are detected by the plant, can stimulate the reaction of the plant, preventing wilting damage.
Genotypes, which are not detected by the plant, but which are avirulent per se, will induce no damage but can fill the ecological gap for Verticillium and prevent the plant from colonization with virulent genotypes.
Authors
P. Schubert, J. Golldack, H. Schwärzel, P. Lentzsch
Keywords
wilt, control, climate change, Fragaria x ananassa, fungus
Online Articles (37)