scholarly journals Inheritance of resistance to Albugo candida in rape (Brassica napus L.)

1983 ◽  
Vol 25 (5) ◽  
pp. 420-424 ◽  
Author(s):  
Z. Fan ◽  
S. R. Rimmer ◽  
B. R. Stefansson
Keyword(s):  
Brassica Napus ◽  
Genetic Study ◽  
Rust Resistance ◽  
Resistant Cultivar ◽  
Inheritance Of Resistance ◽  
Brassica Napus L ◽  
Albugo Candida ◽  
White Rust ◽  
Dominant Genes

Canadian cultivars of Brassica napus are resistant to white rust caused by Albugo candida while many cultivars of this species grown in China are susceptible. Two Chinese lines susceptible to race 7, GCL, and 2282-9, and one Canadian resistant cultivar, 'Regent,' were chosen for a genetic study of resistance to this pathogen. Inheritance of white rust resistance is conditioned by independent dominant genes at three loci; these were designated Ac7-1, Ac7-2, and Ac7-3. The resistance is conferred by dominance at any one of the three loci and plants with recessive alleles at all loci are susceptible. Since different F2 and BC ratios were obtained for populations derived from different individual plants of 'Regent,' this 'Regent' population is not homogeneous for resistance to white rust. All 'Regent' plants appear to be homogeneous for resistance at two loci while, in addition, some may also carry resistance at a third locus.

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 resistance to Puccinia coronata and of floret characters in Avena sterilis

1983 ◽  
Vol 25 (4) ◽  
pp. 329-335 ◽  
Author(s):  
L. S. L. Wong ◽  
R. I. H. McKenzie ◽  
D. E. Harder ◽  
J. W. Martens
Keyword(s):  
Rust Resistance ◽  
Dominant Gene ◽  
Crown Rust ◽  
Puccinia Coronata ◽  
Inheritance Of Resistance ◽  
Avena Sterilis ◽  
Field Isolates ◽  
Crown Rust Resistance ◽  
Dominant Genes

The inheritance of resistance to Puccinia coronata, awn development, lemma pubescence, and lemma color were studied in the Avena sterilis accessions CAV 4248, CAV 4656, and CAV 4904. Three independent, partially dominant genes (Pc-64, Pc-65, Pc-66) in CAV 4248, one partially dominant gene (Pc-67) in CAV 4656, and a dominant gene (Pc-68) in CAV 4904 were identified which conferred resistance to P. coronata. Genes Pc-64, Pc-65, Pc-66, Pc-67, and Pc-68 conferred resistance to 13, 8, 6, 12, and 14 races, respectively, of the 14 races of P. coronata tested. Gene Pc-68 conferred resistance to all field isolates of P. coronata collected in Canada in 1981 and was found to be closely linked or allelic to gene Pc-46. Awns and lemma pubescence were inherited monogenically in crosses with all three CAV accessions. Grey lemma color was controlled by one gene in CAV 4248 and by two genes in CAV 4656. Brown lemma color was controlled by one gene, which was closely linked or pleiotropic with the gene for lemma pubescence in CAV 4904. There was no association between crown rust resistance and the three floret characters studied.

EFFECT OF ALBUGO CANDIDA (PERS. EX CHEV.) KUNTZE ON GROWTH SUBSTANCES IN BRASSICA NAPUS L.

1962 ◽  
Vol 40 (1) ◽  
pp. 53-59 ◽  
Author(s):  
B. I. S. Srivastava ◽  
Michael Shaw ◽  
T. C. Vanterpool
Keyword(s):  
Brassica Napus ◽  
Total Activity ◽  
Growth Substance ◽  
Growth Substances ◽  
Fresh Weight ◽  
Good Source ◽  
Brassica Napus L ◽  
Albugo Candida ◽  
Solvent Systems ◽  
Hydrolysis Of

IAA, IAN, accelerator α, and an ether-insoluble growth substance (designated as 'A') were found in alcohol extracts of healthy inflorescences of Brassica napus L. and in smaller amounts in the malformed, parasitized inflorescences produced by plants infected with Albugo Candida (Pers. ex Chev.) Kuntze. The total activity of diseased extracts (≡ 915 μg IAA/kg fresh weight) was only 61% of that of healthy ones. IAN accounted for approximately 86% of the total activity in both extracts. Brassica is thus a good source of IAN. Both IAA and IAN were identified by their chromogenic reactions, ultraviolet spectra, and Rf values in two solvent systems. Alkaline hydrolysis of 'A' produced an ether-soluble, Ehrlich-positive spot with the same Rf value as IAA. The results are discussed briefly.

OAC TRIUMPH SUMMER RAPE

1990 ◽  
Vol 70 (3) ◽  
pp. 857-859 ◽  
Author(s):  
W. D. BEVERSDORF ◽  
D. J. HUME ◽  
P. GOSTOVIC ◽  
G. CHU ◽  
W. MONTMINY ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oil Content ◽  
Resistant Cultivar ◽  
Western Canada ◽  
Triazine Herbicides ◽  
Brassica Napus L ◽  
Lodging Resistance ◽  
Cultivar Description ◽  
Canola Quality

OAC Triumph is a canola quality, summer-rape (Brassica napus L.) cultivar resistant to s-triazine herbicides and tolerant to as-triazinone herbicides. In 22 trials over 3 yr in Ontario it has averaged 2% higher in yield and had higher oil content, better lodging resistance and fewer green seeds at harvest than the s-triazine-resistant cultivar OAC Triton. In 12 trials over 3 yr in Western Canada, OAC Triumph exhibited similar advantages over OAC Triton.Key words: Rape (summer), s-triazine-resistant, cultivar description

Genetics of rust resistance in tetraploid wheats. III. Genes for resistance to stem rust in certain Durum wheats

1967 ◽  
Vol 18 (2) ◽  
pp. 213
Author(s):  
M Ataullah
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Puccinia Graminis ◽  
Inheritance Of Resistance ◽  
Puccinia Graminis Tritici ◽  
Tetraploid Wheats ◽  
Recessive Genes ◽  
Dominant Genes

The inheritance of resistance to stem rust in four durum wheats, namely P.I.168921, P.I.173401, Gaza, and C.I.7809 was studied. The variety P.I.168921 was found to possess two dominant genes Srt1 and Srt5, P.I.173401 two recessive genes srt6 and srt7, Gaza two dominant genes Srt8 and Srt9, and C.I.7809 genes Srt33 and Srt10, for resistance to Australian strains of Puccinia graminis tritici Erikss. & Henn. It was observed that the genes srt6, srt7, Srt9, and Srt10 were independent of genes already identified. Varieties Khapli, St.464, C.I.7778, and P.I.168921 had gene Srt1Srt1 in common; and varieties St.464, C.I.7778, and C.I.7809 gene Srt3 in common.

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

OÖSPORE GERMINATION IN ALBUGO CANDIDA

1959 ◽  
Vol 37 (2) ◽  
pp. 169-172 ◽  
Author(s):  
T. C. Vanterpool
Keyword(s):  
Brassica Napus ◽  
Fresh Water ◽  
Brassica Napus L ◽  
Exit Tube ◽  
Albugo Candida

In addition to the well-known sessile vesicular zoosporangial type of oöspore germination in Albugo candida (Lév.) Kuntze, a second type is described. This consists of an exit tube one to two and a half times the length of the diameter of the oöspore and about one quarter of its width, at the end of which the vesicular zoosporangium is produced. Best results were secured by soaking the oöspores for 7 to 10 days in water at 10° to 12 °C and then changing to fresh water. The oöspore material came from hypertrophied inflorescences of rape (Brassica napus L. var. annua Koch).

scholarly journals The Arabidopsis TIR-NB-LRR Gene RAC1 Confers Resistance to Albugo candida (White Rust) and Is Dependent on EDS1 but not PAD4

2004 ◽  
Vol 17 (7) ◽  
pp. 711-719 ◽  
Author(s):  
Mohammad H. Borhan ◽  
Eric B. Holub ◽  
Jim L. Beynon ◽  
Kevin Rozwadowski ◽  
S. Roger Rimmer
Keyword(s):  
Positional Cloning ◽  
Rust Resistance ◽  
Interleukin 1 ◽  
Dominant Gene ◽  
Leucine Rich Repeat ◽  
Albugo Candida ◽  
White Rust ◽  
Candida Isolate ◽  
Turn Structure ◽  
Lrr Domain

Resistance to Albugo candida isolate Acem1 is conferred by a dominant gene, RAC1, in accession Ksk-1 of Arabidopsis thaliana. This gene was isolated by positional cloning and is a member of the Drosophila toll and mammalian interleukin-1 receptor (TIR) nucleotide-binding site leucine-rich repeat (NB-LRR) class of plant resistance genes. Strong identity of the TIR and NB domains was observed between the predicted proteins encoded by the Ksk-1 allele and the allele from an Acem1-susceptible accession Columbia (Col) (99 and 98%, respectively). However, major differences between the two predicted proteins occur within the LRR domain and mainly are confined to the β-strand/β-turn structure of the LRR. Both proteins contain 14 imperfect repeats. RAC1-mediated resistance was analyzed further using mutations in defense regulation, including: pad4-1, eds1-1, and NahG, in the presence of the RAC1 allele from Ksk-1. White rust resistance was completely abolished by eds1-1 but was not affected by either pad4-1 or NahG.

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