Production of a self-inhibitor of urediospore germination in Melampsora lini (flax rust) segregates as a recessive, single gene trait

1997 ◽  
Vol 75 (1) ◽  
pp. 74-76 ◽  
Author(s):  
Michael A. Ayliffe ◽  
Greg J. Lawrence ◽  
Jeff G. Ellis ◽  
Anthony J. Pryor
Keyword(s):  
Key Words ◽  
Single Gene ◽  
Single Locus ◽  
Melampsora Lini ◽  
Sexual Hybrid

Two strains of Melampsora lini (flax rust) were identified that differed in their ability to produce a self-inhibitor of urediospore germination. Analysis of germination self-inhibitor production amongst 63 F2 progeny derived from a sexual hybrid of these two strains revealed segregation of this trait. Segregation of urediospore germination self-inhibitor production was consistent with single-locus control with inhibitor production being recessively inherited. Key words: rust, germination, spore, inhibitor.

AC Emerson flax

1996 ◽  
Vol 76 (3) ◽  
pp. 483-485 ◽  
Author(s):  
E. O. Kenaschuk ◽  
K. Y. Rashid ◽  
G. H. Gubbels
Keyword(s):  
Key Words ◽  
Linum Usitatissimum ◽  
Oil Quality ◽  
Calcareous Soils ◽  
Research Centre ◽  
Linum Usitatissimum L ◽  
Melampsora Lini ◽  
Early Maturing ◽  
Cultivar Description ◽  
Moderately Resistant

AC Emerson, a medium-early maturing oilseed flax (Linum usitatissimum L.), was released by Agriculture and Agri-Food Canada, Agri-Food Diversification Research Centre, Morden, Manitoba, in 1994. The cultivar has high oil quality, medium-large seed size and was high yielding in both early and late seeding tests in the Black and the Brown Soil zones of Manitoba and Saskatchewan. Because of its chlorosis tolerance, it is particularly well suited to the calcareous soils of Manitoba. It is immune to North American races of rust caused by Melampsora lini and moderately resistant to wilt caused by Fusarium oxysporum f. sp. lini. Key words: Flax, oilseed, Linum usitatissimum L., cultivar description

Characterization of a single-locus minisatellite DNA in Xenopus laevis

Genome ◽  
1996 ◽  
Vol 39 (1) ◽  
pp. 230-233
Author(s):  
Daniel H. Shain ◽  
Mauricio X. Zuber ◽  
Roger T. Stone ◽  
Jakyoung Yoo
Keyword(s):  
Xenopus Laevis ◽  
Key Words ◽  
Restriction Endonuclease ◽  
Repetitive Dna ◽  
Single Locus ◽  
Repeat Number ◽  
Minisatellite Dna ◽  
Coding Regions ◽  
Flanking Sequences

We have cloned a minisatellite tandem array (XTA) from Xenopus laevis that contains approximately 200 copies of the 20-bp repeat 5′-CCAACAGCCTGCCCATCCAT-3′. The XTA sequence is present only once per haploid genome and is polymorphic with respect to repeat number and location of flanking restriction endonuclease sites. Although the 20-bp repeat has not previously been described, flanking sequences suggest that it lies proximal to coding regions in the Xenopus genome. Key words : repetitive DNA, minisatellite DNA, VNTR, evolution, tetraploid, polymorphic.

Lightning flax

2003 ◽  
Vol 83 (1) ◽  
pp. 89-91 ◽  
Author(s):  
S. D. Duguid ◽  
E. O. Kenaschuk ◽  
K. Y. Rashid
Keyword(s):  
Key Words ◽  
Linum Usitatissimum ◽  
Oil Content ◽  
Oil Quality ◽  
High Yield ◽  
Research Station ◽  
Lodging Resistance ◽  
Linum Usitatissimum L ◽  
Melampsora Lini ◽  
Cultivar Description

Lightning, a medium-late maturing oilseed flax (Linum usitatissimum L.) was released in 2001 by Agriculture and Agri-Food Canada, Morden Research Station, Morden, Manitoba. This cultivar has high oil content, high oil quality, large seed size, good lodging resistance and high yield when seeded in the Black, Brown and Dark Brown soil zones of the prairies. It is immune to North American races of rust caused by Melampsora lini (Ehrenb.) Desmaz, and resistant to wilt caused by Fusarium oxysporum Schlecht. f. sp. lini (Bolley) Snyder & Hansen. Key words: Flax, oilseed, Linum usitatissimum L., cultivar description

Inheritance of virulence of race 370, Melampsora lini

1976 ◽  
Vol 54 (1-2) ◽  
pp. 73-75 ◽  
Author(s):  
G. D. Statler ◽  
D. E. Zimmer
Keyword(s):  
Resistance Genes ◽  
Gene Pair ◽  
Rust Resistance ◽  
Single Gene ◽  
Recessive Gene ◽  
Segregation Ratio ◽  
Single Recessive Gene ◽  
Gene Pairs ◽  
Melampsora Lini

Race 370, Melampsora lini, was selfed and the progeny were tested for virulence on flax cultivars each of which contained a single gene pair for rust resistance. All cultures tested were virulent on flax cultivars with resistance genes L9, M, M1, M2, M4, N1, and P and avirulent on flax cultivars possessing the K, L2, L3, L5, L6, L7, L11, M3, M5, M6, N, N2, P1, P2, P3, and P4 genes for resistance. Segregation for virulence occurred on flax cultivars with the L, L1, L4, and L10 genes. Virulence on cultivars with the L4 and L10 genes was conditioned by single recessive gene pairs. The segregation ratio for virulence on the L1 gene more nearly fit a digenic recessive ratio than a monogenic ratio. Virulence on the cultivar containing the L gene appeared to be conditioned by two recessive gene pairs. Virulence on cultivars with gene L4 was apparently linked with L10, but no linkage was detected between L and L4 or L and L10.

Genetic control of Endosperm Balance Number (EBN) in the Solanaceae based on trisomic and mutation analysis

Genome ◽  
1996 ◽  
Vol 39 (2) ◽  
pp. 314-321 ◽  
Author(s):  
S. A. Johnston ◽  
R. E. Hanneman Jr.
Keyword(s):  
Key Words ◽  
Genetic Control ◽  
Mutation Analysis ◽  
Extra Chromosome ◽  
Single Gene ◽  
Endosperm Balance Number ◽  
Induced Mutation ◽  
Crossing Barriers

The genetic control of Endosperm Balance Number (EBN) was studied using trisomics and induced mutation. In order to induce and detect a change in a factor determining the EBN of the male, pollen from tetraploid Datura was irradiated and used to pollinate diploids. No triploids were produced in over 70 000 fertilizations. At least 70 would have been expected if the deletion of the function of a single gene could change the EBN. An attempt was made to find a particular chromosome that could alter the EBN of the female when it was present as the extra chromosome in 2x + 1 × 4x crosses. In tests of trisomics in both Datura and Solanum (potato) no chromosome could be found that changed the EBN. Therefore, it is concluded that more than one gene and more than one chromosome is involved in determining EBN. Key words : crossing barriers, endosperm, Datura, potato, speciation.

Genetic analysis of pyriform microconidium production in mating population B of Gibberella fujikuroi

1994 ◽  
Vol 72 (8) ◽  
pp. 1209-1210 ◽  
Author(s):  
Fa-Jun Chen
Keyword(s):  
Genetic Analysis ◽  
Key Words ◽  
Single Gene ◽  
Gibberella Fujikuroi ◽  
Fusarium Subglutinans ◽  
Mendelian Gene ◽  
Mating Population

Isolates of Fusarium subglutinans that differ in their ability to produce globose or pyriform microconidia were sexually compatible members of mating population B of Gibberella fujikuroi. Single ascospore isolates from these matings segregated 1:1 for the production of globose or pyriform microconidia, suggesting that a single Mendelian gene controls production of globose or pyriform microconidia. The validity of Fusarium anthophilum as an anamorph species is questioned. Key words: pyriform microconidium, single gene, Fusarium subglutinans, Fusarium anthophilum.

Host–pathogen specificity in postseedling reaction of Linum usitatissimum to Melampsora lini

1992 ◽  
Vol 70 (6) ◽  
pp. 1168-1174 ◽  
Author(s):  
J. A. Hoes ◽  
E. O. Kenaschuk
Keyword(s):  
Linum Usitatissimum ◽  
Genetic Background ◽  
Virulence Genes ◽  
Single Gene ◽  
Adult Plant ◽  
Host Genotype ◽  
Resistance Level ◽  
Melampsora Lini ◽  
Host Pathogen ◽  
Different Levels

Eleven commercial flax cultivars and 10 race differentials, inoculated at the prebloom stage, showed significantly different levels of postseedling resistance to virulent races of flax rust. The effects of hosts and of races were significant or highly significant. Races differentiated hosts, hosts differentiated races, and host × race interaction was highly significant. Non-allelic, single-gene differences in host genotype were associated with higher levels of resistance and were ascribed to epistatic action by an L6-complex and by genes K1, M4, and N1. Epistatic action for susceptibility by gene L9 may have occurred in the race differentials Dakota (L9M) and Koto (L9P). The high aggressiveness of race 22 on 10 commercial race-differentiating hosts was correlated with possession of 26 virulence genes compared with 12–15 genes possessed by three other races. Indications are that allelism of host resistance genes and linked virulence of corresponding virulence genes, and also genetic background, were factors in host × pathogen interactions. The cultivar McGregor is a superior source of postseedling rust resistance because each of its genes K1 and L6 was associated with a high resistance level to race 22. Key words: adult plant, allelism, epistasis, flax.

scholarly journals Inheritance of Stringless Pod in Pisum sativum L.

1992 ◽  
Vol 117 (4) ◽  
pp. 628-632 ◽  
Author(s):  
Rebecca J. McGee ◽  
James R. Baggett
Keyword(s):  
Pisum Sativum ◽  
Plant Height ◽  
Competitive Ability ◽  
Single Gene ◽  
Recessive Gene ◽  
Single Locus ◽  
Pollen Parent ◽  
Single Recessive Gene ◽  
Pisum Sativum L

In crosses between stringless and stringy podded pea cultivars, all plants of the F1 and backcross to the stringy parent had stringy pods. F2 ratios varied widely among crosses, and populations always had more stringy plants than expected, based on a single locus. The ratio of nonsegregating (stringy): segregating F3 families derived from stringy F2 plants fit a single-gene hypothesis in half of the crosses. Backcrosses of F1 to the stringless parent fit the expected 1:1 ratio when the pollen parent was stringless, but the reciprocal backcrosses showed a deficiency of stringless plants, suggesting that poor competitive ability of pollen bearing the stringless factor was the reason for deficiencies of stringless plants. It is concluded that stringlessness is controlled by a single recessive gene for which the designation sin-2 is proposed. A reduction in pod size, plant height, and number of wrinkled seed segregates was associated with stringlessness.

scholarly journals INHERITANCE OF ALPHA-GLYCEROPHOSPHATE DEHYDROGENASE IN THE PINK SALMON, ONCORHYNCHUS GORBUSCHA (WALBAUM)

Genetics ◽  
1973 ◽  
Vol 73 (4) ◽  
pp. 639-643
Author(s):  
Nevin Aspinwall
Keyword(s):  
Single Gene ◽  
Pink Salmon ◽  
Single Locus ◽  
Oncorhynchus Gorbuscha ◽  
Gene Control ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Genetic Crosses ◽  
Glycerophosphate Dehydrogenase

ABSTRACT Genetic crosses of alpha-glycerophosphate dehydrogenase (alpha-GPDH) phenotypes in the pink salmon, Oncorhynchus gorbuscha (Walbaum), reveal that this enzyme is encoded by a single locus with two codominant alleles (Slow and Fast). The significance of single gene control of alpha-GPDH is discussed in relation to the purported tetraploid nature of the salmonids.

Widespread incidence of double-stranded RNAs of unknown function in rust fungi

1990 ◽  
Vol 68 (3) ◽  
pp. 669-676 ◽  
Author(s):  
A. Pryor ◽  
M. G. Boelen ◽  
M. J. Dickinson ◽  
G. J. Lawrence
Keyword(s):  
Growth Rate ◽  
Key Words ◽  
Unknown Function ◽  
Rust Fungi ◽  
Obvious Effect ◽  
Puccinia Sorghi ◽  
Pathogen Virulence ◽  
Melampsora Lini ◽  
Isogenic Strains ◽  
Rate Of Accumulation

Double-stranded (ds) RNAs were found to be present in 33 of 38 collections of rust fungi, representing 15 species from four genera. This finding suggests that dsRNAs occur commonly in rust fungi. Tests were undertaken to determine the role or phenotype associated with the presence of dsRNAs. Comparisons were made between strains of Puccinia sorghi (maize rust) that had different dsRNAs and two fully isogenic strains of Melampsora lini (flax rust), one with no dsRNA and one with at least 13 dsRNAs. It was concluded that dsRNAs had no obvious effect on pathogen virulence or on growth rate as measured by rate of accumulation of leaf chitin or time to pustule eruption. Also it was demonstrated that the presence of dsRNAs had no effect on the interaction that exists between rusts over short distances in the leaf. Key words: dsRNA, rust, function, incidence.

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