INHERITANCE OF RESISTANCE TO POWDERY MILDEW IN THE CULTIVATED STRAWBERRY

1969 ◽  
Vol 11 (2) ◽  
pp. 426-438 ◽  
Author(s):  
C. S. Hsu ◽  
R. Watkins ◽  
A. T. Bolton ◽  
L. P. S. Spangelo
Keyword(s):  
Powdery Mildew ◽  
Quantitative Method ◽  
Powdery Mildew Resistance ◽  
Inheritance Of Resistance ◽  
Complementary Information ◽  
Additive Variance ◽  
Discontinuous Variation ◽  
Mendelian Analysis ◽  
Strawberry Cultivars ◽  
Additive Genes

The inheritance of resistance to powdery mildew was investigated in 64-somewhat interdependent progenies produced among 32 North American strawberry cultivars or selections. The data were analyzed by both the quantitative method based on continuous variation and the Mendelian method based on discontinuous variation. The quantitative analysis indicated that non-additive variance was more important than additive variance and that epistatic variance was considerable. The Mendelian analysis supported the hypothesis that segregation depended on two additive genes for resistance and one epistatic gene far susceptibility. The breeding procedure of progeny selection followed by individual selection was suggested for the improvement of powdery mildew resistance in strawberry based on the complementary information obtained from both analyses.

A COMPARISON OF METHODS FOR ANALYZING INHERITANCE DATA FOR RESISTANCE TO RED RASPBERRY POWDERY MILDEW

1968 ◽  
Vol 10 (2) ◽  
pp. 341-350 ◽  
Author(s):  
Hugh A. Daubeny ◽  
P. B. Topham ◽  
D. L. Jennings
Keyword(s):  
Powdery Mildew ◽  
Powdery Mildew Resistance ◽  
Genetic Interactions ◽  
Continuous Variation ◽  
Red Raspberry ◽  
Complementary Information ◽  
Parental Resistance ◽  
Discontinuous Variation ◽  
Use Of Models ◽  
Additive Genes

The simultaneous use of models applicable to discontinuous and continuous variation for analyzing the segregation of powdery mildew resistance in red raspberry progenies gave complementary information. The analysis based on the model for discontinuous variation supported the hypothesis that segregation was controlled by two additive genes for resistance and one epistatic gene for susceptibility. This analysis gives information on the possible genotypes of the parents which facilitates predictions on the proportion of resistant seedlings expected in breeding programs.The analysis based on the model for continuous variation also indicated that inheritance was predominantly additive with significant genetic interactions. However, the estimates of parental contributions to the progenies were more widely based, because allowance was made for the effects of different gene viabilities, of modifying genes and of environmental influences on expression of the disease. Estimates of combining ability obtained from this model facilitate predictions of mean resistance of progenies.The use of each model appeared to provide a more complete assessment of parental resistance contributions than either model used alone.

scholarly journals Identification of powdery mildew resistance QTL in Fragaria x ananassa

2018 ◽  
Author(s):  
Helen M. Cockerton ◽  
Robert J. Vickerstaff ◽  
Amanda Karlström ◽  
Fiona Wilson ◽  
Maria Sobczyk ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Powdery Mildew Resistance ◽  
Quantitative Resistance ◽  
Field Trials ◽  
Fragaria X Ananassa ◽  
Marker Assisted Breeding ◽  
Mildew Resistance ◽  
Moderate Effect ◽  
Mapping Populations ◽  
Strawberry Cultivars

AbstractThe obligate biotrophic fungus Podosphaera aphanis is the causative agent of powdery mildew on cultivated strawberry (Fragaria x ananassa). Genotypes from two bi-parental mapping populations ‘Emily’ x ‘Fenella’ and ‘Redgauntlet’ x ‘Hapil’ were phenotyped for powdery mildew disease severity in a series of field trials. Here we report multiple QTL associated with resistance to powdery mildew, identified in ten phenotyping events conducted across different years and locations. Seven QTL show a level of stable resistance across multiple phenotyping events however many other QTL were represented in a single phenotyping event and therefore must be considered transient. One of the identified QTL was closely linked to an associated resistance gene across the wider germplasm. Furthermore, a preliminary association analysis identified a novel conserved locus for further investigation. Our data suggests that resistance is highly complex and that multiple additive sources of quantitative resistance to powdery mildew exist across strawberry germplasm. Implementation of the reported markers in marker-assisted breeding or genomic selection would lead to improved powdery mildew resistant strawberry cultivars, particularly where the studied parents, progeny and close pedigree material are included in breeding germplasm.Key MessagePowdery mildew resistance in two strawberry mapping populations is controlled by both stable and transient novel QTL of moderate effect. Some transferability of QTL across wider germplasm was observed.

scholarly journals Identification and Expression Analysis of Fragaria Vesca MLO Genes Involved in Interaction with Powdery Mildew (Podosphaera Aphanis)

2017 ◽  
Vol 1 (1) ◽  
pp. 40-54 ◽  
Author(s):  
Shridhar Jambagi ◽  
Shridhar Jambagi ◽  
Jim M. Dunwell ◽  
Jim M. Dunwell
Keyword(s):  
Powdery Mildew ◽  
Powdery Mildew Resistance ◽  
Resistance Locus ◽  
Fragaria Vesca ◽  
Rna Seq ◽  
Mildew Resistance ◽  
Yield And Quality ◽  
Powdery Mildew Infection ◽  
Strawberry Cultivars ◽  
Diploid Strawberry

Strawberry powdery mildew, caused by Podosphaeraaphanis is a major fungal disease that affects strawberry yield and quality. In the model plant species Arabidopsis and the crop plants barley, tomato and pea, the Mildew resistance locus O (MLO) proteins have been found to be required for powdery mildew susceptibility. The present study, based on the sequence of a wild plum (Prunus americana) MLO protein, identified 16 MLO genes within the genome of woodland strawberry, Fragaria vesca and examined their expression pattern in response to powdery mildew infection in three diploid strawberry cultivars. Phylogenetic analysis showed that the FvMLO genes can be classified into six clades. Four FvMLO genes were grouped into clade III, which comprises MLO genes from Arabidopsis, tomato and grapevine that mediate powdery mildew susceptibility. A RNA-seq analysis of two diploid strawberry cultivars, F. vescassp. vesca accession Hawaii 4 (HW) and F. vesca f. semperflorens line “Yellow Wonder 5AF7” (YW) at 1 d (1 DAI) and 8 d (8 DAI) after infection showed the expression of 12 out of the 16 FvMLO genes. The comparison of Fragments Per Kilobase of transcript per Million mapped reads (FPKM values) detected by RNA-seq and expression values of qRT-PCR for FvMLO genes showed substantial agreement. The FvMLO3 gene, which was grouped in clade III and orthologous to the Arabidopsis,tomato and grapevine genes, was highly expressed in YW compared to other FvMLO genes across varieties. The results showed that FvMLO genes can be used as potential candidates to engineer powdery mildew resistance in strawberry based on MLO suppression or genome editing.

scholarly journals 458 PB 335 HERITABILITY ESTIMATES OF POWDERY MILDEW RESISTANCE IN A TWO-YEAR-OLD LILAC POPULATION

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 496g-496
Author(s):  
Randy Johnson
Keyword(s):  
Powdery Mildew ◽  
Genetic Correlation ◽  
Significant Positive Correlation ◽  
Powdery Mildew Resistance ◽  
Phenotypic Correlation ◽  
Narrow Sense ◽  
Environmental Correlation ◽  
Plant Family ◽  
Additive Variance ◽  
Mildew Resistance

Twenty-one control-pollinated families of lilac (Syringa) were evaluated for the presence of powdery mildew (Microsphaera syringae). Because disease developed first in the lower portions of the plant and moved up, infection was scored from the lowest (1 =only on the lower quarter of the plant) to the highest quarter of the plant (4=present on all quarters of the plant). Family means for mildew score ranged from 2.3 to 3.8 and averaged 3.1, and for height ranged from 59 to 107 cm and averaged 82 cm. Narrow sense and broad sense he&abilities were estimated to be 0.08 and 0.27 respectively. Since any selections will be clonal, this relatively large proportion of non-additive variance can be fully utilized. There was a significant positive correlation between family means of height and mildew score (0.58); however, the phenotypic correlation between height and mildew score was -0.11. For this population the genetic correlation between mildew infection and height was positive (the taller families on average had mildew farther up the plant), but the environmental correlation was negative.

Identification and SSR Mapping of Two Powdery Mildew Resistance Genes in Wild Emmer (Triticum dicoccoides) Accessions IW3 and IW10

2009 ◽  
Vol 35 (5) ◽  
pp. 761-767 ◽  
Author(s):  
Gen-Qiao LI ◽  
Ti-Lin FANG ◽  
Hong-Tao ZHANG ◽  
Chao-Jie XIE ◽  
Zuo-Min YANG ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Resistance Genes ◽  
Powdery Mildew Resistance ◽  
Triticum Dicoccoides ◽  
Wild Emmer ◽  
Mildew Resistance

Identification of Powdery Mildew Resistance Gene in Pea Line X9002

2015 ◽  
Vol 41 (4) ◽  
pp. 515 ◽  
Author(s):  
Zhong-Yi WANG ◽  
Hai-Ning FU ◽  
Su-Li SUN ◽  
Can-Xin DUAN ◽  
Xiao-Fei WU ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Resistance Gene ◽  
Powdery Mildew Resistance ◽  
Powdery Mildew Resistance Gene ◽  
Mildew Resistance
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