Can the durability of resistance be predicted?

2006 ◽  
Vol 86 (15) ◽  
pp. 2523-2526 ◽  
Author(s):  
Lesley A Boyd
Keyword(s):  
Durability Of Resistance

scholarly journals Apple powdery mildew caused by Podosphaera leucotricha: some important features of biology and epidemiology

2009 ◽  
Vol 15 (1-2) ◽  
Author(s):  
I. J. Holb
Keyword(s):  
Powdery Mildew ◽  
Temporal Dynamics ◽  
Host Susceptibility ◽  
Spore Dispersal ◽  
Podosphaera Leucotricha ◽  
Causal Organism ◽  
Disease Symptoms ◽  
Diurnal Patterns ◽  
Basic Features ◽  
Durability Of Resistance

In this review, some important features of biology and epidemiology are summarised for apple powdery mildew (Podosphaera leucotricha). In the first part of the review, the geographical distribution or the pathogen are discussed, then the morphology and taxonomy of the causal organism are described. Disease symptoms or apple powdery mildew are also shown and then host susceptibility/resistance is discussed in relation to durability of resistance. In the second part of this review, the general disease cycle of powdery mildew on apple are demonstrated and some basic features of powdery mildew epidemiology (such response of the pathogen to temperature, relative humidity, and rain as well as spore production, spore dispersal, diurnal patterns and temporal dynamics of the pathogen/disease) are also given on apple host.

Durability of Resistance in Tomato and Pepper to Xanthomonads Causing Bacterial Spot

2009 ◽  
Vol 47 (1) ◽  
pp. 265-284 ◽  
Author(s):  
Robert E. Stall ◽  
Jeffrey B. Jones ◽  
Gerald V. Minsavage
Keyword(s):  
Bacterial Spot ◽  
Durability Of Resistance

Probability of Mutation to Multiple Virulence and Durability of Resistance Gene Pyramids: Further Comments.

1991 ◽  
Vol 81 (3) ◽  
pp. 240-242 ◽  
Author(s):  
C. C. Mundt
Keyword(s):  
Resistance Gene ◽  
Durability Of Resistance

Lack of durability of resistance to cereal rusts in wheat when selection is for complete resistance

1995 ◽  
Vol 114 (6) ◽  
pp. 539-541 ◽  
Author(s):  
D. L. Danial ◽  
F. M. Kirigwi ◽  
J. E. Parlevliet
Keyword(s):  
Complete Resistance ◽  
Cereal Rusts ◽  
Durability Of Resistance

Global incidence of wheat rusts and powdery mildew during 1969–2010 and durability of resistance of winter wheat variety Bezostaya 1

2011 ◽  
Vol 132 (3) ◽  
pp. 323-340 ◽  
Author(s):  
Alexey Morgounov ◽  
Hale Ann Tufan ◽  
Ram Sharma ◽  
Beyhan Akin ◽  
Ahmet Bagci ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Wheat Variety ◽  
Winter Wheat Variety ◽  
Wheat Rusts ◽  
Durability Of Resistance

scholarly journals Durability of Resistance to Globodera pallida I. Changes in Pathogenicity, Virulence, and Aggressiveness During Reproduction on Partially Resistant Potato Cultivars

1997 ◽  
Vol 87 (8) ◽  
pp. 862-867 ◽  
Author(s):  
Henk J. Schouten ◽  
Johanna E. Beniers
Keyword(s):  
Egg Production ◽  
Potato Cultivars ◽  
Globodera Pallida ◽  
Susceptible Host ◽  
Hardy Weinberg Equilibrium ◽  
Different Populations ◽  
Different Levels ◽  
Reproduction Factor ◽  
Simple Numerical Model ◽  
Durability Of Resistance

We studied changes in pathogenicity, virulence, and aggressiveness of Globodera pallida populations over time. As a measure for pathogenicity, the reproduction factor on a partially resistant host was used; for aggressiveness, the reproduction factor on a susceptible reference host was used; and, for virulence, the ratio pathogenicity/aggressiveness was used. The G. pallida populations were reared in a glasshouse for four generations on potato cultivars with different levels of resistance. The cultivar Elkana did not increase pathogenicity significantly, but the more resistant cultivars Karakter and Darwina did. This increase in pathogenicity was caused by an increase in virulence, whereas aggressiveness generally was not altered significantly. The increase in virulence appeared to be caused by an enhanced ability of eggs to develop into cysts, and not by an increase in egg production per new cyst. The observed changes in virulence could be predicted reasonably well by a simple numerical model. The rate of selection depended strongly on the nematode population. Rearing a mix of two different populations on a susceptible host decreased the virulence strongly, as predicted by the Hardy-Weinberg equilibrium, but increased the aggressiveness because of heterosis.

Durability of Resistance to Viruses in the Potato

1993 ◽  
pp. 350-350 ◽  
Author(s):  
K. M. Swiezynski ◽  
M. Chrzanowska ◽  
M. A. Dziewonska ◽  
M. Was
Keyword(s):  
Resistance To Viruses ◽  
Durability Of Resistance

scholarly journals Potato Cultivars from the Mexican National Program: Sources and Durability of Resistance Against Late Blight

2002 ◽  
Vol 92 (7) ◽  
pp. 688-693 ◽  
Author(s):  
Niklaus J. Grünwald ◽  
Mateo A. Cadena Hinojosa ◽  
Oswaldo Rubio Covarrubias ◽  
Antonio Rivera Peña ◽  
John S. Niederhauser ◽  
...  
Keyword(s):  
Late Blight ◽  
Genetic Background ◽  
Potato Late Blight ◽  
Field Resistance ◽  
Potato Acreage ◽  
Land Race ◽  
National Potato ◽  
Using Data ◽  
Selection Of ◽  
Durability Of Resistance

The Mexican National Potato Program has produced several cultivars with high levels of field resistance. We evaluated the durability of resistance to potato late blight of a selection of 12 such cultivars using data from 1960 to the present. Data were extracted from the field notebooks located in the archives of the Mexican National Potato Program in the John S. Niederhauser Library in Toluca, Mexico. There was a trend indicating that field resistances to potato late blight of Mexican cultivars released between 1965 to 1999 were durable. At least two of the cultivars, namely ‘Sangema’ and ‘Tollocan’, have been grown on at least 4 to 5% of the potato acreage and over long periods of time without decay in levels of field resistance. Pedigrees of the 12 cultivars indicate that most of the field resistance was introgressed from Solanum demissum. Field resistance might also be derived from commonly grown land-race cultivars such as ‘Amarilla de Puebla’ and ‘Leona’. These have been grown in Mexico since about the 1780s. They have the appearance of S. andigena-derived material but their genetic background is unknown.

scholarly journals Genetics of wheat somaclones resistance to Bipolaris sorokiniana Shoem.

2002 ◽  
Vol 38 (SI 1 - 6th Conf EFPP 2002) ◽  
pp. 186-188
Author(s):  
L.G. Tyryshkin ◽  
N.A. Tyryshkina-Shishelova
Keyword(s):  
Root Rot ◽  
Initial Level ◽  
Bipolaris Sorokiniana ◽  
Spot Blotch ◽  
Genetics Of Resistance ◽  
Common Root ◽  
Common Root Rot ◽  
Brown Leaf Spot ◽  
Brown Leaf ◽  
Durability Of Resistance

Genetics of resistance to common root rot and dark brown leaf spot blotch (both caused by Bipolaris sorokiniana Shoem.)<br />was studied in wheat somaclonal lines, obtained in calluses culture of samples 181-5 and Vera. Four different approaches<br />were used: linear analysis of resistance in generations of segregating somaclonal lines, hybridological analysis, study<br />of resistance components, study of possible durability of resistance. Results showed, that resistance to both diseases is<br />likely controlled by polygenic systems with additive actions of minor genes. Different lines possess non-identical genetic<br />systems for resistance. Several lines kept their initial level of resistance to spot blotch after 5 cycles of the pathogen<br />artificial population reproduction.

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