scholarly journals Relationship between the extent of colonization byVerticillium dahliaeand symptom expression in strawberry (Fragaria × ananassa) genotypes resistant to verticillium wilt

2010 ◽  
Vol 59 (2) ◽  
pp. 376-381 ◽  
Author(s):  
D. V. Shaw ◽  
T. R. Gordon ◽  
J. Hansen ◽  
S. C. Kirkpatrick
Keyword(s):  
Verticillium Wilt ◽  
Symptom Expression ◽  
Fragaria Ananassa

Vascular coating: a barrier to colonization by the pathogen in Verticillium wilt of tomato

1989 ◽  
Vol 67 (2) ◽  
pp. 600-607 ◽  
Author(s):  
Jane Robb ◽  
D. A. Powell ◽  
P. F. S. Street
Keyword(s):  
Disease Resistance ◽  
Verticillium Wilt ◽  
Water Samples ◽  
Light Microscope ◽  
Trapping Site ◽  
Symptom Expression ◽  
Susceptible Tomato ◽  
Ve Gene ◽  
Verticillium Albo Atrum

Massive infusion of conidia of Verticillium albo-atrum Reinke & Berthier induced synchronous secretion of vascular coating in the petiolar xylem vessels of resistant and susceptible tomato near-isolines. More coating formed earlier in resistant than in susceptible plants. In the susceptible plants secretion was delayed in colonized trapping site vessels, but initiated in surrounding uncolonized ones. Controls were infused with water. Samples were quantified by light microscope assay techniques at 18, 48, and 120 h postinoculation for the following parameters: (i) delayed coating effect, (ii) overall coating capacity, and (iii) ability of fungus to "escape" laterally from trapping site vessels. The results showed that susceptibility to Verticillium was absolutely correlated with the presence of the delayed coating effect in the plant and increased ability of the fungus to spread laterally. Treatment of inoculated resistant plants with an inhibitor of coating secretion resulted in conversion to the susceptible phenotype. The progeny of a genetic backcross for the dominant (Ve) and recessive (ve) alleles at the Ve locus (Velve × velve) were assayed for the same parameters as well as for disease resistance based on symptom expression. The results confirmed the previous observations and suggested that in tomato the delayed phenotype is recessive. The data strongly supports two hypotheses: (i) coating forms a barrier against fungal penetration and (ii) the timing of the coating response in trapping site vessels results, directly or indirectly, from expression of the Ve gene.

Verticillium wilt of chrysanthemum: colonization of leaves in relation to symptom development

1971 ◽  
Vol 49 (2) ◽  
pp. 181-185 ◽  
Author(s):  
R. Hall ◽  
L. V. Busch
Keyword(s):  
Verticillium Wilt ◽  
Significant Contribution ◽  
Vascular System ◽  
Symptom Expression ◽  
Rapid Rise ◽  
Symptom Development ◽  
Flower Buds ◽  
Advanced Stages ◽  
Wilt Symptom ◽  
Leaf Exudate

The vascular system of leaves of chrysanthemum plants inoculated with Verticillium dahliae was invaded by mycelium before the appearance of visible wilt symptoms. After flower buds appeared a rapid rise in the number of propagules of fungus in the leaf was followed by a rise in severity of visible wilt symptom expression and conductivity of leaf exudate. Those portions of the leaf with the most advanced stages of wilt contained the greatest amounts of fungus. It is suggested that the mycelium within the leaf makes a significant contribution to the development of symptoms of wilt.

VANTAGE STRAWBERRY

1986 ◽  
Vol 66 (4) ◽  
pp. 1025-1026
Author(s):  
C. L. RICKETSON ◽  
VICTORIA P. GRAY ◽  
FRANCES I. COOK ◽  
A. A. VANDENBERG ◽  
ADAM DALE
Keyword(s):  
Verticillium Wilt ◽  
General Purpose ◽  
Fragaria Ananassa ◽  
Fruit Breeding ◽  
Cultivar Description ◽  
Good Flavor ◽  
Verticillium Albo Atrum

Vantage is a June-bearing strawberry (Fragaria × ananassa Duch.) released as a general purpose berry. The fruit is bright, firm and has good flavor. The plant is very resistant to verticillium wilt and foliage diseases.Key words: Fragaria × ananassa Duch., fruit breeding, strawberry, Verticillium albo-atrum R. and B., cultivar description

Verticillium wilt of chrysanthemum: suppression of fungal colonization of leaves and prevention of wilt symptom development by foliar applications of benomyl

1971 ◽  
Vol 49 (11) ◽  
pp. 1987-1991 ◽  
Author(s):  
Lloyd V. Busch ◽  
Robert Hall
Keyword(s):  
Verticillium Wilt ◽  
Fungal Growth ◽  
Tween 20 ◽  
Fungal Colonization ◽  
Systemic Fungicide ◽  
Symptom Expression ◽  
Symptom Development ◽  
Fungal Activity ◽  
Single Leaf ◽  
Wilt Symptom

This report describes the use of a systemic fungicide in a study of the relation between fungal colonization of a plant and symptom expression. The systemic fungicide benomyl (methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate) was used to selectively suppress development of Verticillium dahliae in leaves of chrysanthemum plants infected via the roots.Benomyl sprayed or painted onto foliage at weekly intervals as a 20 mg/liter solution in 0.25% aqueous Tween 20 restricted development of V. dahliae in leaves and prevented wilt symptom development. Numbers of propagules of V. dahliae recovered from stems of symptomless benomyl-treated plants were similar to those recovered from stems of untreated inoculated plants expressing wilt symptoms. Material toxic to Verticillium was detected in leaves but not in stems of plants receiving foliar paint applications of benomyl. Benomyl applied repeatedly to a single leaf on an inoculated plant suppressed fungal growth and symptom development in that leaf while untreated leaves wilted and became necrotic in the usual way. The observations support the hypothesis that symptom expression in leaves of chrysanthemum plants infected with Verticillium is largely due to fungal activity within infected leaves rather than fungal activity in the roots or stem.

MICMAC STRAWBERRY

1978 ◽  
Vol 58 (3) ◽  
pp. 903-904
Author(s):  
D. L. CRAIG ◽  
L. E. AALDERS ◽  
G. W. BISHOP
Keyword(s):  
Nova Scotia ◽  
Verticillium Wilt ◽  
Fruit Size ◽  
Fruit Yield ◽  
Fruit Rot ◽  
Fragaria Ananassa ◽  
Virus Diseases ◽  
Red Stele ◽  
Late Selection

Micmac strawberry (Fragaria × ananassa Duch.) is a mid-late selection from the cross Tioga × K61-87. In Nova Scotia, fruit yield, fruit size, firmness, appearance and frozen quality of Micmac compare favorably with those of the standard cultivars Redcoat and Bounty. Micmac grows vigorously and is somewhat susceptible to common foliage and virus diseases. Resistance to red stele, verticillium wilt and fruit rot appear to equal that of Redcoat and Bounty.

scholarly journals Genetic Response for Reaction to Verticillium Wilt in Strawberry with Two-stage Family and Genotypic Selection

HortScience ◽  
2003 ◽  
Vol 38 (3) ◽  
pp. 432-434 ◽  
Author(s):  
Douglas V. Shaw ◽  
Thomas R. Gordon
Keyword(s):  
Verticillium Wilt ◽  
Selection Procedure ◽  
Resistance Breeding ◽  
Fragaria Ananassa ◽  
Family Selection ◽  
Relative Resistance ◽  
Two Stage ◽  
Verticillium Dahlia ◽  
Resistance Score ◽  
Selection Of

Strawberry (Fragaria ×ananassa Duch.) genotypes retained for resistance to Verticillium wilt (Verticillium dahliae Kleb.) after two cycles of a two-stage (TS) selection procedure consisting of full-sib family selection followed by within-family selection of individuals, and genotypes retained for resistance using genotypic mass (GM) selection were crossed to a common set of moderately susceptible genotypes. The relative resistance of the seedlings from these progenies was compared using a resistance score and the percentage of stunted plants. Although the two sets of resistant parents had performed similarly in genotypic comparisons, those genotypes selected using the TS procedure yielded test cross offspring with significantly higher resistance scores (X̄ = 3.84 ± 0.09 vs. X̄ = 3.46 ± 0.09, t = 3.11**) and significantly lower rates of plant stunting (X̄ = 38.1% ± 3.1 vs. X̄ = 50.2% ± 2.9, t = 2.87**) than the parents chosen using GM selection. Further resolution using analysis of variance and general combining ability (GCA) estimates showed that these between-set differences resulted from higher resistance breeding values for parents selected using the TS procedure. The five genotypes with largest GCA for resistance score and four of the five genotypes with minimum GCA for percentage stunting were obtained by TS selection.

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