Inheritance of Resistance against Phytophthora Infestans in Wiled Tomato Genotype (Lycopersicon hirsutum l03684) وراثة المقاومة للندوة المتاخرة فی الترکیب الوراثی البری L03684 التابع للنوع Lycopersicon hirsutum

2019 ◽  
Vol 10 (8) ◽  
pp. 675-679
Author(s):  
سمیر العفیفی ◽  
وهبه السید ◽  
ولید السعدی ◽  
بولا عبد الملک
Keyword(s):  
Phytophthora Infestans ◽  
Inheritance Of Resistance ◽  
Lycopersicon Hirsutum ◽  
Tomato Genotype

IV.—Inheritance of Resistance to Two Strains of Blight (Phytophthora infestans de Bary) in Potatoes

1944 ◽  
Vol 61 (1) ◽  
pp. 137-147 ◽  
Author(s):  
William Black
Keyword(s):  
Disease Resistance ◽  
Plant Breeding ◽  
Phytophthora Infestans ◽  
Inheritance Of Resistance ◽  
Breeding Work ◽  
Resistant Species ◽  
Breeding Station ◽  
In The Wild ◽  
Plant Breeding Station

The existence in Mexico of blight-resistant species of potato has been known for many years, but they occur in the wild and are quite unsuitable for agricultural purposes. In order to utilise their resistance to disease it is necessary to combine disease resistance with the cropping qualities of cultivated forms while eliminating the undesirable characters which are prominent in the wild forms. Breeding work with this object in view has been in progress at the Scottish Plant Breeding Station for several years, and results obtained in the course of testing progenies for reaction to blight infection are discussed in the following pages.

XVII.—Inheritance of Resistance to Blight (Phytophthora infestans) in Potatoes: Inter-Relationships of Genes and Strains

1951 ◽  
Vol 64 (3) ◽  
pp. 312-352 ◽  
Author(s):  
William Black
Keyword(s):  
Disease Resistance ◽  
Phytophthora Infestans ◽  
Hypersensitive Response ◽  
Environmental Conditions ◽  
Wild Species ◽  
Major Gene ◽  
Phenotypic Expression ◽  
Inheritance Of Resistance ◽  
Different Types ◽  
The Common

SynopsisThe common strain and six specialised strains of Phytophthora infestans have been employed in testing potato varieties and seedling progenies bred from the wild species S. demissum for resistance to the disease. Resistance, due to the hypersensitive condition of the protoplasm, is manifested in the presence of major genes, and four such genes have been identified, viz. R1, R2, R3 and R4. Each gene induces in the plant a hypersensitive response to infection with the common strain and with a particular group of specialised strains of the parasite. The genes are inherited independently in simple Mendelian fashion, but in the segregations three different types of deviations from standard disomic ratios occur due to (a) unpaired chromosomes, (b) incompatibility factors, and (c) partial autosyndesis. A series of minor genes modify the phenotypic expression of the major gene system and so differentiate grades of hypersensitivity or of susceptibility as the case may be.The common strain of P. infestans appears to be a population persisting at an equilibrium determined by host range and environmental conditions. Mutations frequently occur, but new forms survive only when host genotypes, to which they are specially adapted, are available.

Inheritance of resistance to potato virus Y in tomato

1988 ◽  
Vol 39 (3) ◽  
pp. 475 ◽  
Author(s):  
JE Thomas ◽  
DJ McGrath
Keyword(s):  
Potato Virus ◽  
Genetic Background ◽  
Potato Virus Y ◽  
Recessive Gene ◽  
Inheritance Of Resistance ◽  
Lycopersicon Hirsutum ◽  
Single Recessive Gene ◽  
Tomato Cultivar ◽  
Segregation Data ◽  
Susceptible Tomato

A line of Lycopersicon hirsutum (P.I. 247087) was resistant to iystemic infection by 10 isolates of potato virus Y (PVY) from Queensland. The inheritance of resistance to PVY was studied in crosses between a susceptible tomato cultivar (L. esculentum cv. Floradade) and P.I. 247087. Analysis of segregation data from PVY-inoculated parent lines, F1, F2 and backcross generations, supported the hypothesis that resistance is conferred by a single recessive gene. However, the effect of this gene was, in some generations, apparently modified by the highly susceptible genetic background of Floradade tomato. A backcrossing programme has commenced to incorporate this resistance into a commercially acceptable tomato cultivar.

scholarly journals Pathogenic Fitness of Oosporic Progeny Isolates of Phytophthora infestans on Late-Blight-Resistant Tomato Lines

Plant Disease ◽  
2009 ◽  
Vol 93 (9) ◽  
pp. 947-953 ◽  
Author(s):  
Shiri Klarfeld ◽  
Avia (Evgenia) Rubin ◽  
Yigal Cohen
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Field Isolate ◽  
Late Blight Resistance ◽  
The Other ◽  
Host Genotype ◽  
Unit Leaf ◽  
Tomato Genotype ◽  
Different Levels ◽  
Tomato Genotypes

Four A1 field isolates and one A2 field isolate of Phytophthora infestans were crossed to produce oospores in tomato leaves. The oospores were extracted and mixed with perlite and water, and healthy tomato leaves were used as bait for oospore-progeny infection. Twenty-nine lesions were obtained from the four crosses and 283 single-sporangium isolates were recovered and tested on four tomato differential lines carrying different major genes (Ph-0, Ph-1, Ph-2, and 3707) for late blight resistance. The pathogenic fitness (number of sporangia per unit leaf area) of parental and progeny isolates was strongly dependent on the host genotype; it decreased in the order Ph-0 > Ph-1 > Ph-2 > 3707. The A2 parent had a higher pathogenic fitness than the A1 parents on Ph-0 and Ph-1 but similar, lower fitness on Ph-2. Different levels of pathogenic fitness were observed across all isolates on Ph-0, although Ph-0 lacks resistance genes. Pathogenic fitness on one tomato genotype was not related to the pathogenic fitness on the other tomato genotypes. Some isolates exhibited reduced pathogenic fitness relative to the respective A1 parent, whereas others demonstrated a higher pathogenic fitness compared with the A2 parent. The tomato genotype Solanum pimpinellifolium L3707/5 was resistant to all five parental isolates of P. infestans. However, 37 of the 283 progeny isolates from 11 different lesions had compatible reactions with this line, producing up to 31 × 103 sporangia/cm2. Overall, reduced fitness was more frequent among the progeny isolates than increased fitness.

scholarly journals Resistance to Phytophthora Infestans in Three Solanum Nigrum F3 Families

2014 ◽  
Vol 66 (1) ◽  
pp. 63-73 ◽  
Author(s):  
Jadwiga Śliwka ◽  
Iga Tomczyńska ◽  
Marcin Chmielarz ◽  
Emil Stefańczyk ◽  
Renata Lebecka ◽  
...  
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Single Gene ◽  
Late Blight Resistance ◽  
Solanum Nigrum ◽  
The Other ◽  
Blight Resistance ◽  
Inheritance Of Resistance ◽  
Detached Leaf ◽  
Complex Inheritance

AbstractSolanum nigrumis a self-pollinating, hexaploid weed and one of a fewSolanaceaespecies native to Europe. It used to be described as a non-host forPhytophthora infestans. However, now it is known that, like its distant relatives: potato (Solanum tuberosumL.) and tomato (Solanum lycopersicumL.),S. nigrumcan suffer from potato late blight caused by this pathogen. Both susceptible and resistantS. nigrumgenotypes have been previously identified and inheritance of resistance originating from one accession has been described based on population of F2plants and 15 F3lines. The goal of this study was to evaluate resistance of three families of F3lines, originating from crosses between a susceptible and three different resistantS. nigrumaccessions followed by two self-pollinations. Parental accessions were tested for the spectrum of late blight resistance against 48P. infestansisolates. The three families consisted of 106, 96 and 115 F3lines, respectively, and from each line 20 plants were tested for resistance toP. infestans. Laboratory detached leaf assays were performed in two dates and two replications of three leaves each. Segregation of the trait within the line allowed us to distinguish hetero- and homozygous lines. In one F3family, the ratio of resistant homozygotes: heterozygotes: susceptible homozygotes was 1:2:1, indicating that a single gene is most likely underlying the late blight resistance in this case. In the other two, observed segregations of the trait significantly deviated from this model suggesting more complex inheritance patterns.

Inheritance of Resistance to Blight (Phytophthora infestans) in Potatoes: Strain C and its Relationships

1950 ◽  
Vol 64 (2) ◽  
pp. 216-228 ◽  
Author(s):  
William Black
Keyword(s):  
Phytophthora Infestans ◽  
Wild Species ◽  
Inheritance Of Resistance ◽  
Potato Varieties ◽  
Qualitative Nature ◽  
The Common ◽  
The Difference

SynopsisThe common strain A of the blight fungus (Phytophthora infestans) and two new strains, B and C, have been employed in testing potato varieties and seedling progenies, bred from the wild species S. demissum, for resistance to the disease. The reactions of seedlings to infection with strain C are compared with those of strains A and B. The C strain is shown to be more virulent than A, since it attacks some A resistant as well as all A susceptible plants. Likewise the B strain is more virulent than A. The difference between the pathogenicity of strains B and C, however, is not one of degree of virulence; one plant may be B resistant-C susceptible, while another may be B susceptible-C resistant. This difference is essentially of a qualitative nature. Resistance to these strains, which is manifested by the hypersensitive condition of the plant's cells, is produced in the presence of three major independent genes, Re, Rb and Rbc, which confer resistance to strains A and C, A and B, and A, B and C respectively. Segregations in each case are similar in type, and are characterised by an excess of recessive individuals.

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