Resistance to powdery mildew (Oidium lycopersicum) in Lycopersicon hirsutum is controlled by an incompletely-dominant gene Ol-1 on chromosome 6

1994 ◽  
Vol 89 (4) ◽  
pp. 467-473 ◽  
Author(s):  
J. G. van der Beek ◽  
G. Pet ◽  
P. Lindhout
Keyword(s):  
Powdery Mildew ◽  
Dominant Gene ◽  
Chromosome 6 ◽  
Lycopersicon Hirsutum ◽  
Oidium Lycopersicum

Characterization and mapping of resistance to Oidium lycopersicum in two Lycopersicon hirsutum accessions: evidence for close linkage of two Ol-genes on chromosome 6 of tomato

Heredity ◽  
2000 ◽  
Vol 85 (6) ◽  
pp. 511-520 ◽  
Author(s):  
Cai-Cheng Huang ◽  
Petra M Hoefs-van de Putte ◽  
Jantine G Haanstra-van Der Meer ◽  
Fien Meijer-Dekens ◽  
Pim Lindhout
Keyword(s):  
Close Linkage ◽  
Chromosome 6 ◽  
Lycopersicon Hirsutum ◽  
Oidium Lycopersicum

Inheritance of resistance to powdery mildew (Oidium lycopersicum) and its linkage to an SSR marker in tomato hybrid DRW4409

2010 ◽  
Vol 90 (6) ◽  
pp. 803-807 ◽  
Author(s):  
C. He ◽  
V. Poysa ◽  
K. Yu ◽  
C. Shi
Keyword(s):  
Powdery Mildew ◽  
Resistance Gene ◽  
Ssr Marker ◽  
Dominant Gene ◽  
Inheritance Of Resistance ◽  
Genetic Population ◽  
Tomato Plants ◽  
Ssr Loci ◽  
Oidium Lycopersicum ◽  
Serious Disease

Powdery mildew is a serious disease for greenhouse and field tomatoes in North America. The main objective of this experiment was to study the genetic inheritance of resistance to powdery mildew in tomato hybrid DRW4409 and to identify simple sequence repeat (SSR) markers linked to the resistance gene. Analysis of a genetic population derived from DRW4409 showed that resistance to powdery mildew is controlled by a single dominant gene. Screening 158 SSR loci found that the SSR marker, LEat014, is linked to this gene at a map distance of 8.0 cM. To the best of our knowledge, this is the first report of an SSR linked to the resistance gene in DRW4409. Because of its co-dominant nature, this SSR should be useful to breeders in screening tomato plants for resistance to powdery mildew when DRW4409 is used as the resistance gene source.

INHERITANCE OF ADULT PLANT RESISTANCE TO POWDERY MILDEW IN SOYBEANS

1978 ◽  
Vol 20 (1) ◽  
pp. 151-153 ◽  
Author(s):  
R. I. Buzzell ◽  
Jerry H. Haas
Keyword(s):  
Glycine Max ◽  
Powdery Mildew ◽  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Dominant Gene ◽  
Recessive Allele ◽  
Adult Plant ◽  
Glycine Max L ◽  
Greenhouse Tests

In greenhouse tests with Microsphaera diffusa Cke &Pk. on soybeans (Glycine max (L.) Merr.), adult plant resistance was found to be governed by a dominant gene, proposed as Rmd, with the recessive allele, rmd, resulting in susceptibility at all stages.

scholarly journals An allele at the triose phosphate isomerase, Tpi-1 locus on chromosome 6 recovered from feral mice

1987 ◽  
Vol 50 (3) ◽  
pp. 239-243 ◽  
Author(s):  
Grahame Bulfield ◽  
Simon T. Ball ◽  
Josephine Peters
Keyword(s):  
Preliminary Report ◽  
Dominant Gene ◽  
Heat Stability ◽  
Inbred Strains ◽  
Triose Phosphate Isomerase ◽  
Marker Genes ◽  
Chromosome 6 ◽  
Structural Locus ◽  
Triose Phosphate ◽  
The Common

SummaryAn animal with low erythrocyte triose phosphate isomerase (TPI) activity was found amongst mice trapped on a farm in Leicestershire. The low TPI activity was caused by the segregation of a single co-dominant gene which also affected the Km for glyceraldehyde-3-phosphate and heat stability of the enzyme. We designate the gene Tpi-1, the structural locus for TPI, with the a allele in the common inbred strains and the b allele derived from the wild-caught mouse. Tpi-1 was known to be on chromosome 6 by somatic cell techniques and, as shown in a preliminary report (Peters & Bulfield, 1984), we have confirmed and extended this finding using three chromosome-6 marker genes giving the order: Sig-28-Lc-11-Miwh-16-Tpi-1.

scholarly journals Linked, if Not the Same, Mi-1 Homologues Confer Resistance to Tomato Powdery Mildew and Root-Knot Nematodes

2011 ◽  
Vol 24 (4) ◽  
pp. 441-450 ◽  
Author(s):  
Alireza Seifi ◽  
Isgouhi Kaloshian ◽  
Jack Vossen ◽  
Daidi Che ◽  
Kishor K. Bhattarai ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Powdery Mildew ◽  
Gene Cluster ◽  
Chromosome 6 ◽  
R Genes ◽  
Near Isogenic Lines ◽  
Root Knot Nematodes ◽  
Isogenic Lines ◽  
Tomato Chromosome ◽  
Tomato Powdery Mildew

On the short arm of tomato chromosome 6, a cluster of disease resistance (R) genes have evolved harboring the Mi-1 and Cf genes. The Mi-1 gene confers resistance to root-knot nematodes, aphids, and whiteflies. Previously, we mapped two genes, Ol-4 and Ol-6, for resistance to tomato powdery mildew in this cluster. The aim of this study was to investigate whether Ol-4 and Ol-6 are homologues of the R genes located in this cluster. We show that near-isogenic lines (NIL) harboring Ol-4 (NIL-Ol-4) and Ol-6 (NIL-Ol-6) are also resistant to nematodes and aphids. Genetically, the resistance to nematodes cosegregates with Ol-4 and Ol-6, which are further fine-mapped to the Mi-1 cluster. We provide evidence that the composition of Mi-1 homologues in NIL-Ol-4 and NIL-Ol-6 is different from other nematode-resistant tomato lines, Motelle and VFNT, harboring the Mi-1 gene. Furthermore, we demonstrate that the resistance to both nematodes and tomato powdery mildew in these two NIL is governed by linked (if not the same) Mi-1 homologues in the Mi-1 gene cluster. Finally, we discuss how Solanum crops exploit Mi-1 homologues to defend themselves against distinct pathogens.

scholarly journals Inheritance of Resistance to Powdery Mildew Race 2 in Citrullus lanatus var. lanatus

HortScience ◽  
2013 ◽  
Vol 48 (10) ◽  
pp. 1227-1230 ◽  
Author(s):  
Antonia Y. Tetteh ◽  
Todd C. Wehner ◽  
Angela R. Davis
Keyword(s):  
Powdery Mildew ◽  
Citrullus Lanatus ◽  
Dominant Gene ◽  
Breeding Strategy ◽  
Dominance Model ◽  
Narrow Sense Heritability ◽  
Stem Resistance ◽  
Nonallelic Interactions ◽  
Race 2 ◽  
Moderate Resistance

Information on the mode of inheritance of powdery mildew resistance in watermelon is important for designing a breeding strategy for the development of new cultivars. Resistance in the watermelon accession PI 270545 was investigated by generation means analysis by crossing it with susceptible PI 267677. The analyses showed involvement of two genes, a recessive resistance gene, pmr-1, and a dominant gene for moderate resistance, Pmr-2. Resistance to powdery mildew in the leaf had a large dominance effect and a heritability of 71%. The additive-dominance model was inadequate in explaining variation in leaf resistance as revealed by the joint scaling test. However, nonallelic interactions could not be detected by the nonweighted six-parameter scaling test. For stem resistance, the additive-dominance model was adequate, and inheritance was controlled mainly by additive effects. A high narrow-sense heritability of 79% suggested that selection for stem resistance in early generations would be effective.

scholarly journals Genes for Resistance to Powdery Mildew Races 1 and 2U.S. in Melon PI 313970

HortScience ◽  
2003 ◽  
Vol 38 (4) ◽  
pp. 591-594 ◽  
Author(s):  
James D. McCreight
Keyword(s):  
Powdery Mildew ◽  
Cucumis Melo ◽  
Powdery Mildew Resistance ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Sphaerotheca Fuliginea ◽  
Limited Data ◽  
Race 1 ◽  
Resistance Reaction ◽  
Greenhouse Tests

Powdery mildew is a major problem in melon (Cucumis melo L.) production worldwide. Three genes for resistance to Sphaerotheca fuliginea (Schlecht. ex Fr.) Poll. race 1 and race 2U.S. were identified in growth chamber and greenhouse tests in the cross of PI 313970 × `Top Mark'. A recessive gene conditioned resistance of true leaves to race 1. A recessive gene appeared to condition resistance of cotyledons to race 2U.S., although a second recessive gene may be involved. A semi-dominant gene conditioned resistance of true leaves to race 2U.S. Limited data suggested linkage of the recessive gene for resistance to race 1 and the semi-dominant gene for resistance to race 2U.S. The resistance reaction of PI 313970 to infection of true leaves by race 2U.S. included water-soaked spots and resistant blisters, but segregation data for the resistant blister reaction were inconclusive. Allelic relationships of these genes with previously reported melon powdery mildew resistance genes remain to be determined.

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