Inheritance of Resistance to Race 2 of Cercospora sojina in Soybeans 1

Crop Science ◽  
1965 ◽  
Vol 5 (4) ◽  
pp. 332-332 ◽  
Author(s):  
A. H. Probst ◽  
K. L. Athow ◽  
F. A. Laviolette
Keyword(s):  
Inheritance Of Resistance ◽  
Cercospora Sojina ◽  
Race 2

THE INHERITANCE OF LOOSE SMUT RESISTANCE.: I. THE INHERITANCE OF RESISTANCE IN FOUR BARLEY VARIETIES IMMUNE TO RACE 2 OF LOOSE SMUT

1962 ◽  
Vol 42 (1) ◽  
pp. 69-77 ◽  
Author(s):  
E. N. Larter ◽  
H. Enns
Keyword(s):  
Disease Resistance ◽  
Dominant Gene ◽  
The Other ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Loose Smut ◽  
Race 2 ◽  
Or Genes ◽  
Dominant Genes

Four barley varieties, each immune to a Valki-attacking culture of loose smut (designated as race 2), were studied with respect to the inheritance of their resistance. Jet (C.I. 967) and Nigrinudum (C.I. 2222) were each found to possess two independent dominant genes determining resistance. Steudelli (C.I. 2266) proved to be immune to race 2 through the action of a single dominant gene, while resistance of Hillsa (C.I. 1604) was found to be conditioned by two complementary dominant genes. The absence of susceptible F3 families in crosses between Jet, Nigrinudum, and Steudelli indicated that these three varieties have in common a gene or genes for resistance to the race of smut used. The two complementary genes for resistance in Hillsa proved to be distinct from those of the other three varieties under study.The use of genetic analyses of disease resistance based upon classification of F3 families of the backcross to the resistant source is described and the merits of such a method are discussed.

Inheritance of resistance in cucumber to race 2 of Colletotrichum lagenarium

1990 ◽  
Vol 79 (1) ◽  
pp. 13-16 ◽  
Author(s):  
D. C. Linde ◽  
W. C. Bridges ◽  
B. B. Rhodes
Keyword(s):  
Inheritance Of Resistance ◽  
Colletotrichum Lagenarium ◽  
Race 2

INHERITANCE OF RESISTANCE TO Albugo Candida Race 2 IN MUSTARD (Brassica Juncea (L.) Czern.)

1988 ◽  
Vol 68 (2) ◽  
pp. 297-300 ◽  
Author(s):  
A. S. TIWARI ◽  
G. A. PETRIE ◽  
R. K. DOWNEY
Keyword(s):  
Brassica Juncea ◽  
Nuclear Genes ◽  
Growth Chamber ◽  
Inheritance Of Resistance ◽  
Resistant Parent ◽  
Albugo Candida ◽  
White Rust ◽  
Race 2 ◽  
Made In

The inheritance of resistance to white rust (Albugo Candida) race 2 in mustard (Brassica juncea) was studied in crosses involving one resistant and two susceptible cultivars. Inoculations were made in a growth chamber followed by growth of the plants under greenhouse conditions. The reaction of the F1 was like the resistant parent, indicating that resistance is dominant and controlled by nuclear genes. Backcrosses of F1 plants to the resistant parent showed the same reactions as that of the resistant parent. Backcrosses of F1 to the susceptible parents segregated in a 1:1 ratio of resistant to susceptible. The F2 segregation of resistant and susceptible plants gave a good fit to a 3:1 ratio. The study revealed that resistance is monogenic and could be easily transferred to adapted susceptible genotypes via backcrossing.Key words: Brassica juncea, Albugo Candida, mustard, white rust

Inheritance of Resistance of Cowpea to Phytophthora vignae in Whole Plants, Cuttings and Stem Callus Cultures

1989 ◽  
Vol 37 (6) ◽  
pp. 511 ◽  
Author(s):  
KS Bateman ◽  
JM Hinch ◽  
JE Ralton ◽  
AE Clarke ◽  
JA Mckenzie ◽  
...  
Keyword(s):  
Single Gene ◽  
Callus Cultures ◽  
Post Inoculation ◽  
Susceptible Cultivar ◽  
Inheritance Of Resistance ◽  
Gene Complex ◽  
Rooted Cuttings ◽  
Hybrid Plants ◽  
Race 2 ◽  
Whole Plants

The inheritance of resistance of cowpea to Phytophthora vignae race 2 has been examined in seedlings from F1, F2 and backcross generations from crosses between a susceptible cultivar, cv. Poona, and a near-isogenic resistant cultivar, cv. Caloona. Resistance is dominant and controlled by a single gene (gene complex). A non-subjective method, based on comparison of the lengths of lesions produced on hybrid and parental seedlings after inoculation of cut epicotyls, was used to classify hybrid plants as resistant and susceptible. This method takes into account the variation in responses to infection between batches of plants assayed on different days. Two other criteria were used to indicate resistance: the presence of reddening responses, 3 days post-inoculation; and the ability of plants to recover 35 days after inoculation of cut epicotyls. Resistance is also expressed in excised leaves of rooted cuttings, and in stem callus derived from cv. Caloona and F1 plants.

scholarly journals Inheritance of Resistance to Bacterial Blight in 21 Cultivars of Rice

2003 ◽  
Vol 93 (2) ◽  
pp. 147-152 ◽  
Author(s):  
K. S. Lee ◽  
S. Rasabandith ◽  
E. R. Angeles ◽  
G. S. Khush
Keyword(s):  
Bacterial Blight ◽  
Oryza Sativa L ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Inheritance Of Resistance ◽  
Race 1 ◽  
Group 2 ◽  
Race 2 ◽  
Moderate Resistance ◽  
Group 1

Genetic analysis for resistance to bacterial blight (Xanthomonas oryzae pv. oryzae) of 21 rice (Oryza sativa L.) cultivars was carried out. These cultivars were divided into two groups based on their reactions to Philippine races of bacterial blight. Cultivars of group 1 were resistant to race 1 and those of group 2 were susceptible to race 1 but resistant to race 2. All the cultivars were crossed with TN1, which is susceptible to all the Philippine races of X. oryzae pv. oryzae. F1 and F2 populations of hybrids of group 1 cultivars were evaluated using race 1 and F1 and F2 populations of hybrids of group 2 cultivars were evaluated using race 2. All the cultivars showed monogenic inheritance of resistance. Allelic relationships of the genes were investigated by crossing these cultivars with different testers having single genes for resistance. Three cultivars have Xa4, another three have xa5, one has xa8, two have Xa3, eight have Xa10, and one has Xa4 as well as Xa10. Three cultivars have new, as yet undescribed, genes. Nep Bha Bong To has a new recessive gene for moderate resistance to races 1, 2, and 3 and resistance to race 5. This gene is designated xa26(t). Arai Raj has a dominant gene for resistance to race 2 which segregates independently of Xa10. This gene is designated as Xa27(t). Lota Sail has a recessive gene for resistance to race 2 which segregates independently of Xa10. This gene is designated as xa28(t).

scholarly journals Evaluation of Susceptibility of Carnation Cultivars to Fusarium Wilt and Determination of Fusarium oxysporum fsp. dianthi Races in Southwest Spain

HortScience ◽  
2007 ◽  
Vol 42 (3) ◽  
pp. 596-599 ◽  
Author(s):  
Ana María Prados-Ligero ◽  
María José Basallote-Ureba ◽  
Carlos José López-Herrera ◽  
José María Melero-Vara
Keyword(s):  
Genetic Diversity ◽  
Fusarium Oxysporum ◽  
Environmental Conditions ◽  
Previous Experiment ◽  
Inheritance Of Resistance ◽  
Variable Response ◽  
Polygenic Inheritance ◽  
Commercial Cultivars ◽  
Race 2

Eighteen commercial cultivars of carnation were inoculated with eight isolates of F. oxysporum fsp. dianthi (Fod) from a collection of isolates obtained from diseased plants surveyed in the main growing area of Spain. Susceptible reactions were shown in most cultivars inoculated with six isolates characterized as race 2 when tested on differentials. However, cultivars Elsy and Westcristal were fully resistant to the six isolates, whereas ‘Scarlet King’ showed a variable response, suggesting genetic diversity within race 2 of Fod. In contrast, eight cultivars inoculated with three isolates of races 1 or 8 were usually resistant except for cultivars Nelson and Solar, which were fully susceptible, and ‘Elsy’, which showed resistance to only one of the isolates. Partial polygenic inheritance of resistance to race 2 determines the complexity in the host reactions. Nine cultivars used in the previous experiment were inoculated with 13 Italian isolates of a collection of races of Fod. Cultivar reactions to isolates of different races agreed with some reports but not with others, suggesting an effect of environmental conditions or inoculation method. Reactions under field conditions sometimes differed from reactions with artificial inoculation in the greenhouse and growth chamber, usually more prone to express susceptibility.

scholarly journals Inheritance of resistance to Fusarium oxysporum f. sp. phaseoli Brazilian race 2 in common bean

2009 ◽  
Vol 66 (6) ◽  
pp. 788-792 ◽  
Author(s):  
Mônica Juliani Zavaglia Pereira ◽  
Magno Antonio Patto Ramalho ◽  
Ângela de Fátima Barbosa Abreu
Keyword(s):  
Fusarium Oxysporum ◽  
Inheritance Of Resistance ◽  
Additive Effects ◽  
Selection Methods ◽  
Narrow Sense ◽  
Phaseolus Vulgaris L ◽  
Degree Of Dominance ◽  
Resistant Lines ◽  
Parental Lines ◽  
Race 2

Aiming to obtain information concerning the genetic control of the resistance of the bean (Phaseolus vulgaris L.) to the fungus Fusarium oxysporum f. sp. phaseoli, six crosses involving three resistant lines (Carioca MG, Esal 583 and Esal 566) and four susceptible to the fungus (Carioca, CNFC 10443, Uirapuru and Esal 522) were developed. The parental lines, the controls (Carioca MG and Carioca) and the F1, F2 and F3 generations were evaluated for reaction to Fusarium. For inoculation, root cuttings were immersed in a spore suspension. The evaluations were performed at 21 days after inoculation, by scale of notes ranging from 1.0, to 9.0 and genetic and phenotypic parameters were estimated. The heritability in the narrow sense ranged from 0.34 to 0.42 and in the broad sense of 0.76 to 0.97, showing that selection should be easy, since efficient inoculation and selection methods are used. The average degree of dominance was around 1.0 indicating the presence of dominance in the control of the character, although additive effects are also expressive.

scholarly journals Quantitative Trait Loci Underlying Partial Resistance to Cercospora sojina Race 2 Detected in Soybean Seedlings in Greenhouse Assays

2017 ◽  
Vol 3 (1) ◽  
pp. 175-182
Author(s):  
Hemlata Sharma ◽  
David A Lightfoot
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Partial Resistance ◽  
Recombinant Inbred Lines ◽  
Chromosome 8 ◽  
Cercospora Sojina ◽  
Trait Loci ◽  
The Cross ◽  
Race 2 ◽  
Leaf Symptoms

Cercospora sojina (Hara), an air-borne pathogen, infects soybean [Glycine max (L.) Merr.] leaves causing frog-eye leaf spot (FLS). Three major genes (Rcs1-3) underlie resistance to the major races of FLS but two were not yet mapped. In addition quantitative trait loci provide partial resistance to many strains. FLS race 2 was an isolate first collected in the 1950’s when damaging FLS first arose. ‘Essex’ was partially resistant while ‘Forrest’ was partially susceptible to mixed races of FLS. The objective here was to identify quantitative trait loci underlying resistance to FLS race 2 in the greenhouse using recombinant inbred lines (RILs) derived from the cross of Essex by Forrest. C. sojina race 2 (ATCC 44531) was used to induce leaf symptoms on one hundred F5:14 RILs derived from the cross of Essex by Forrest. The leaf symptoms were measured at 21 days after manual infestation by wounding (dai) and again at 42 dai to show resistance to reinfestation of new leaves from the primary lesions without wounding. Bags over leaves were not used to better simulate field conditions. However, there was no significant correlation between FLS severity at 21 and 42 dai (r =0.08 and P= 0.005). At 21 dai there was a strongly significant QTL near Satt319 on LG C2 (chromosome 7; LOD 3.8; R2 52%) where the Essex allele reduced leaf symptoms by 0.7 units. At 42 dai there was a strongly significant QTL near Satt632 on LG A2 (chromosome 8; R2 was 15%; LOD was 3.6) where the Essex allele reduced leaf symptoms by 0.4 units. Neither locus mapped to the location of Rcs3. By ANOVA thirteen additional minor loci were detected on LGs A1, B1, F, G, H, I, J, K, L, M and O. At two loci (LG B1 and O) the Forrest allele appeared to reduce FLS at both 21 and 42 dai. Eight loci may have reduced FLS at 21 dai (0.006 < P < 0.049; 4% < R2 > 9%) of which 5 had beneficial alleles from Forrest. Seven loci may have reduced FLS at 42 dai (0.001 < P < 0.04; 4% < R2 < 15%) of which 4 had beneficial alleles from Forrest. Therefore, quantitative resistance to race 2 of FLS was inferred to have major loci contributions from Essex and minor loci contributions from both Forrest and Essex. Resistance was dependent on plant age. Breeding and selection for FLS will be complex and may be more efficient with the markers, germplasm and models of inheritance reported here.

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