scholarly journals Sunflower breeding for resistance to the new races of broomrape (Orobanche cumana Wallr.) in Romania

2017 ◽  
Vol 38 (SI 2 - 6th Conf EFPP 2002) ◽  
pp. 604-607
Author(s):  
M. Păcureanu joiţa ◽  
E. Procopovici ◽  
S. Raranciuc
Keyword(s):  
Dominant Gene ◽  
Inbred Lines ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Plant Materials ◽  
Artificial Infestation ◽  
Differential Set ◽  
Actual Spectrum ◽  
New Race ◽  
New Races

The actual spectrum of the broomrape races in Romania has changed. The study of the sunflower differential set for the broomrape races, under natural and artificial infestation demonstrated the existence of a new spectrum of these races. We assigned the new race with F and the corresponding gene for resistance, with Or6 gene. In our breeding work for resistance to this new race of the parasite, the results we have this far achieved in introducing genes for resistance to broomrape into sunflower value inbred lines are important. Our use of convergent crosses based on transgressive recombination has proven very suitable as a method for incorporating resistance genes into standard sunflower lines. The χ<sup>2</sup> test has shown the inheritance of resistance to be controlled by a single dominant gene. The results have also confirmed that the presence of broomrape in plant materials can be diagnosed very early in the season using a modification of the Pancenko method. An assessment made 40 days after sowing showed that broomrape plants were for the most part well developed by that time.

INHERITANCE OF RESISTANCE TO USTILAGO NUDA IN BARLEY

1952 ◽  
Vol 30 (5) ◽  
pp. 525-536 ◽  
Author(s):  
William P. Skoropad ◽  
L. P. V. Johnson
Keyword(s):  
Dominant Gene ◽  
Genetic Constitution ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Loose Smut ◽  
New Gene ◽  
Ustilago Nuda ◽  
New Race

The inheritance of resistance to loose smut races Tr and Ts (a new race) was studied in several barley crosses and backcrosses in which the varieties Jet and Titan were the resistant parents. Jet is resistant to race Tr and race Ts, Titan to race Tr only. Genetical analyses were based (a) on a classification of F2 plants according to the smut reaction of their F3 progeny, and (b) on the reaction of selfed generation backcrosses involving recessive (susceptible) parents. The resistance of Titan and of Jet to Tr was found in each case to be due to a single, dominant gene, designated as Un and Un3, respectively. The resistance of Jet to Ts was also found to be due to a single, dominant gene. This is probably a "new" gene and has been provisionally designated Un6. Resistance was found to be determined by the genetic constitution of the developing embryo rather than by that of surrounding floral structures.

INHERITANCE OF CROWN RUST RESISTANCE IN THREE ACCESSIONS OF AVENA STERILIS

1980 ◽  
Vol 22 (1) ◽  
pp. 27-33 ◽  
Author(s):  
D. E. Harder ◽  
R. I. H. McKenzie ◽  
J. W. Martens
Keyword(s):  
Rust Resistance ◽  
Dominant Gene ◽  
Crown Rust ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Avena Sterilis ◽  
Oat Crown Rust ◽  
Crown Rust Resistance ◽  
Resistance Spectrum ◽  
Dominant Genes

The inheritance of resistance to oat crown rust was studied in three accessions of Avena sterilis L. Accession CAV 4274 originated from Morocco, CAV 4540 from Algeria, and CAV 3695 from Tunisia. Seedling rust tests on F2 backcross families indicated the presence of two dominant genes for crown rust resistance in CAV 4274. One of these, a gene conditioning resistance to most races tested, was linked or allelic to gene Pc-38, and was designated gene Pc-62. The second gene conferred resistance only to one of the six races studied, and was not tested further. In CAV 4540, a single dominant gene, Pc-63 was possibly allelic with Pc-62 and linked or allelic to Pc-38. Genes Pc-62 and 63 are generally similar to Pc-38 in their resistance spectrum, but these three genes are differentiated by races CR 102, CR 103, and CR 107. A single dominant gene in CAV 3695 appeared to be Pc-50.

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.

Herencia de la resistencia al daño mecánico por Tagosodes orizicolus (Muir) (Homoptera: Delphacidae) en arroz

1969 ◽  
Vol 84 (1-2) ◽  
pp. 47-52
Author(s):  
Catherine Pardey ◽  
Federico Cuevas-Pérez ◽  
César P. Martínez ◽  
Alberto Pantoja
Keyword(s):  
Dominant Gene ◽  
Mechanical Damage ◽  
Modifier Gene ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Resistance Evaluation ◽  
Insect Attack ◽  
Homozygous Form

The inheritance of resistance to mechanical damage in rice caused by sogata, Tagosodes orizicolus (Muir), was studied in cultivars with this resistance. Evaluation of F1 and F3 generations suggests that resistance to mechanical damage is controlled by a single dominant gene (A). This gene, present in cultivars Makalioka and Mudgo, is homozygous. The gene confers resistance, but its expression is modified by another gene (B). The action of the modifier gene is dependent on the genotype and the exposure to insect attack. For Mudgo, the modifier gene is in the homozygous form (bb), which accelerates the expression of the susceptible phenotype. In Makalioka, the dominant homozygous form (BB) retards the expression of susceptibility.

INHERITANCE OF RESISTANCE TO FRUIT FLY IN WATERMELON

1978 ◽  
Vol 20 (1) ◽  
pp. 31-34 ◽  
Author(s):  
R. C. Khandelwal ◽  
Prem Nath
Keyword(s):  
Citrullus Lanatus ◽  
Dominant Gene ◽  
Fruit Fly ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Sources Of Resistance ◽  
Resistant Gene

Inheritance of resistance to the fruit fly Dacus cucurbitae Coq., was studied in intervarietal crosses of watermelon Citrullus lanatus (Thunb.) Mansf. Two sources of resistance J 18-1 and J 56-1 were used. The resistance of watermelon to the fruit fly was controlled by a single dominant gene. The symbol Fwr has been proposed to denote the resistant gene.

scholarly journals Inheritance of Resistance to Blackeye Cowpea Mosaic Virus in White Acre-BVR' Cowpea

HortScience ◽  
1991 ◽  
Vol 26 (2) ◽  
pp. 194-196 ◽  
Author(s):  
Sohedjie Ouattara ◽  
Oyette L. Chambliss
Keyword(s):  
Mosaic Virus ◽  
Dominant Gene ◽  
Enzyme Linked Immunosorbent Assay ◽  
Symptom Expression ◽  
Inheritance Of Resistance ◽  
Cowpea Mosaic Virus ◽  
Single Dominant Gene ◽  
Susceptible Parent ◽  
Resistant Parent ◽  
Blackeye Cowpea Mosaic Virus

Reciprocal crosses were made between `White Acre-BVR', resistant to blackeye cowpea mosaic virus (BICMV), and the susceptible `California Blackeye No. 5' cowpea [Vigna unguiculata (L.) Walp.]. Seedlings from `California Blackeye No. 5', `White Acre-BVR', F1, F2, and backcrosses were mechanically inoculated with BICMV, and evaluated 4 weeks later for symptom expression in the greenhouse. Plants were assayed by enzyme-linked immunosorbent assay. The resistance observed in the F1 and progeny from the backcross to the resistant parent indicated that resistance to BICMV in `White Acre-BVR' was dominant. Furthermore, a 1 resistant: 1 susceptible segregation of progeny from the backcross to the susceptible parent and a 3 resistant: 1 susceptible segregation of the F2 progenies suggested that the resistance to BICMV in `White Acre-BVR' was conferred by a single dominant gene.

INHERITANCE OF RESISTANCE TO BLACK SHANK IN NICOTIANA TABACUM L.

1971 ◽  
Vol 13 (3) ◽  
pp. 422-428 ◽  
Author(s):  
G. B. Collins ◽  
Paul D. Legg ◽  
C. C. Litton ◽  
M. J. Kasperbauer
Keyword(s):  
Nicotiana Tabacum ◽  
Dominant Gene ◽  
Inheritance Of Resistance ◽  
Breeding Line ◽  
Single Dominant Gene ◽  
Black Shank ◽  
Resistant Genotype ◽  
Burley Tobacco ◽  
Nicotiana Tabacum L ◽  
Resistant Progeny

Resistance to race 0 of black shank (Phytophthora parasitica var. Nicotianae) derived from Nicotians longiflora Cav. and transferred to the burley tobacco breeding line L8 appears to be conditioned by a single dominant gene. However, on the basis of expected ratios for a single dominant gene, a deficiency of resistant progeny was observed in the F2 and backcross generations. Haploid plants extracted from F1 individuals heterozygous for black shank resistance substantiated the deficiency in the resistance class. The haploid segregation with reduced recovery of the resistant genotype rules out preferential pollination as the cause for the altered ratios. The mechanism responsible for impaired function of the gamete carrying the allele for resistance is not known.

scholarly journals Mapping of resistance genes to races 1, 3 and 5 of Podosphaera xanthii in melon PI 414723

2013 ◽  
Vol 13 (4) ◽  
pp. 349-355 ◽  
Author(s):  
Ana Carolina Fazza ◽  
Leandro José Dallagnol ◽  
Ana Cristina Fazza ◽  
Carolina C. Monteiro ◽  
Bruno Marco de Lima ◽  
...  
Keyword(s):  
Linkage Group ◽  
Genetic Map ◽  
Resistance Genes ◽  
Segregation Analysis ◽  
Specific Resistance ◽  
Dominant Gene ◽  
Inheritance Of Resistance ◽  
Podosphaera Xanthii ◽  
Single Dominant Gene ◽  
First Time

The fungus Podosphaera xanthii affects melon crops and presents several races controlled by race-specific resistance genes. The accession PI 414723 is resistant to races 1, 3 and 5 and it is a suitable source of resistance genes. The inheritance of resistance to these races was analyzed on 87 F2 plants from the cross of PI 414723 × Védrantais, and resistance to all three races could be explained by the segregation of a single dominant gene, although a digenic model could also be accepted. A genetic map was assembled with 206 markers, and co-segregation analysis of resistance phenotypes indicated the existence of two linked loci in linkage group II, one conferring resistance to races 1 and 5 (denominated Pm-x1,5), and the second to race 3 (denominated Pm-x3), located 5.1 cM apart. This study reports for the first time the existence of Pm-x3 and the genetic locations of these resistance genes from PI 414723.

Inheritance of resistance to rust (Phakopsora pachyrhizi) in soybeans

1980 ◽  
Vol 31 (5) ◽  
pp. 951 ◽  
Author(s):  
RJ McLean ◽  
DE Byth
Keyword(s):  
Dominant Gene ◽  
Soybean Rust ◽  
Inheritance Of Resistance ◽  
Phakopsora Pachyrhizi ◽  
Single Dominant Gene ◽  
Dominant Genes

A study was conducted to determine the inheritance of resistance to soybean rust in three soybean accessions-PI200492, Tainung 3 and Tainung 4. The results suggest that PI200492 and Tainung 3 contain the same single dominant gene for resistance, and that Tainung 4 contains two dominant genes for resistance, one of which is identical with that in PI200492 and Tainung 3.

scholarly journals Inheritance of Resistance to Passionfruit Woodiness Virus in Common Bean (Phaseolus vulgaris L.)

HortScience ◽  
2000 ◽  
Vol 35 (5) ◽  
pp. 880-881 ◽  
Author(s):  
R. Provvidenti
Keyword(s):  
Phaseolus Vulgaris ◽  
Common Bean ◽  
Dominant Gene ◽  
Bean Common Mosaic Virus ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Phaseolus Vulgaris L ◽  
Rooted Cuttings ◽  
Backcross Populations ◽  
Dark Green

Passionfruit woodiness virus (PWV) can infect bean (Phaseolus vulgaris L.), causing a light and dark green foliar mosaic, veinbanding, downward curling, and plant stunting. The intensity of these symptoms can vary with the strain of the virus and cultivar, but they resemble those caused by bean common mosaic virus. In genetic populations derived from crosses and backcrosses involving cultivars that are resistant (`Black Turtle 1', `Clipper', and `RedKote') or susceptible (`Black Turtle 2', `California Light Red Kidney', and `Pioneer'), a single dominant gene conferred resistance to an Australian strain PWV-K. To this gene, the symbol Pwv (Passionfruit woodiness virus) is tentatively assigned. In plants derived from rooted cuttings of backcross populations, the same factor also conditioned resistance to three other Australian strains, PWV-Mild, PWV-51, and PWV-Tip Blight.

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