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.

scholarly journals A Proposed Model for Inheritance of Primocane Fruiting in Tetraploid Erect Blackberry

2000 ◽  
Vol 125 (2) ◽  
pp. 217-221 ◽  
Author(s):  
Jose Lopez-Medina ◽  
James N. Moore ◽  
Ronald W. McNew
Keyword(s):  
Negative Relationship ◽  
Recessive Gene ◽  
Segregation Ratio ◽  
Breeding Strategies ◽  
Single Recessive Gene ◽  
Tetrasomic Inheritance ◽  
Proposed Model ◽  
Inheritance Model ◽  
Diallel Crossing ◽  
Scheme Selection

Inheritance of the primocane-fruiting (PF) characteristic was studied in seedling populations of tetraploid (4x) blackberries (Rubus subgenus Rubus). Four selections (A-1836, A-593, A-830, and A-1680) and two cultivars (`Arapaho' and `Shawnee') were used as parents in a full diallel crossing scheme. Selection A-593 was used as the main source for PF due to its origin (`Brazos' × `Hillquist,' the latter an old PF cultivar). All parents except `Shawnee' have A-593 in their parentage; among the parents, only A-1836 fully expresses PF. Selfing of A-1836 resulted in 100% PF offspring, indicating that A-1836 is homozygous for this trait. Selfing of A-593, A-830, and `Arapaho' produced either a 35:1 or a 20.8:1 FF (floricane or summer-fruiting):PF segregation ratio, fitting a tetrasomic inheritance model under either random chromosome assortment (RCSA) or random chromatid assortment (RCTA), respectively, also suggesting that PF is controlled by a single recessive gene and that the parents are duplex (AAaa) for this trait. Selection A-1680 and `Shawnee' selfed did not produce PF progeny, but when crossed with the nulliplex A-1836, gave a 27:1 FF:PF ratio, indicating RCTA and that they are triplex (AAAa) for PF. According to these research, both gametic outputs (RCSA and RCTA) seem to operate in 4x blackberry. The intensity in expression of PF had a negative relationship with time to harvest, with those seedlings showing the highest PF scores producing a crop in early to mid-August. This knowledge will be helpful in implementing breeding strategies to produce PF blackberry cultivars.

scholarly journals Inheritance of a Mild Reaction to Lettuce Mosaic

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 612e-612 ◽  
Author(s):  
Edward J. Ryder
Keyword(s):  
Plant Resistance ◽  
Single Gene ◽  
Recessive Gene ◽  
Leaf Margin ◽  
Single Recessive Gene ◽  
Reaction Type ◽  
Vein Clearing ◽  
Resistant Lines ◽  
Selection Of

Resistance to lettuce mosaic (LMV) in current cultivars of lettuce is due to a single recessive gene, momo, in one of two allelic forms. The nature of the resistance may be described as resistance to multiplication and spread in the plant. Resistance is systemically manifested as small irregular yellowish areas on the leaf. This compares to the usual expression of susceptibility: vein clearing, followed by mottling, leaf margin recurving, and later stunting and yellowing. A cos-like stem lettuce from Egypt, `Balady Aswan', is susceptible to LMV, but reaction to the virus is a milder one than the usual susceptible reaction. Segregating generations from crosses with normal susceptible and resistant lines were analyzed. The data suggest a single gene for reaction type, with mild dominant or partially dominant to severe. Selection of lines from crosses with the resistant type allows the breeder to select resistant and mild alleles together, which confers a higher level of resistance than momo alone. Plants with the combined reaction either show no symptom or show the resistant symptom very late.

SINGLE GENE CONTROL OF SEED COLOR AND HYPOCOTYL COLOR IN TURNIP RAPE

1982 ◽  
Vol 62 (2) ◽  
pp. 331-334 ◽  
Author(s):  
J. A. HAWK
Keyword(s):  
Brassica Campestris ◽  
Single Gene ◽  
Recessive Gene ◽  
Early Flowering ◽  
Pigment Production ◽  
Gene Control ◽  
Seed Color ◽  
Single Recessive Gene ◽  
Wild Type ◽  
Turnip Rape

The association between hypocotyl color and seed color in turnip rape (Brassica campestris L.) was investigated in crosses of a green hypocotyl, yellow-seeded stock with an early flowering wild-type stock and the Torch cultivar. A complete association was noted between seed color and hypocotyl color. These data are consistent with the hypothesis that a single recessive gene may block pigment production in both hypocotyl and seed. The relevance of this information for breeding yellow-seeded turnip rape cultivars is discussed.

scholarly journals Transmission Ratio Distortion Due to the bl Gene in Table Beet

2001 ◽  
Vol 126 (3) ◽  
pp. 340-343 ◽  
Author(s):  
Diane Austin ◽  
I.L. Goldman
Keyword(s):  
Single Gene ◽  
Recessive Gene ◽  
Segregation Ratio ◽  
Transmission Ratio Distortion ◽  
Transmission Ratio ◽  
Wild Type ◽  
Gene Model ◽  
Male Gametes ◽  
Ratio Distortion ◽  
The Individual

The bl gene conditions a blotchy phenotype (irregular sectors of red and white root color) in table beet (Beta vulgaris ssp. vulgaris). Segregation of the bl gene was found to be consistent with a single recessive gene, however, some evidence for a departure from a single gene model was observed when blbl plants were used as females. In this report, segregation of the bl gene was examined in greater detail in 10 F2 populations derived from crosses of red blotchy-rooted females (genotype blbl, denoted blotchy) with red-rooted males (BlBl, denoted red,), and 10 F2 populations derived from the reciprocal cross. In blbl × BlBl crosses, the proportion of red-rooted progeny was greater than 0.75 in seven of the crosses, and was significantly greater (P = 0.005) in three crosses. A test for heterogeneity was significant, indicating that the proportion of red-rooted progeny differed significantly in these 10 crosses. In BlBl × blbl crosses, the proportion of red-rooted progeny was <0.75 in seven of the crosses and there were no significant departures from the expected 3:1 ratio in any of the individual crosses. However, a pooled estimate of the segregation ratio showed a significant (P < 0.01) departure from the 3:1 ratio (pooled estimate = 0.71). These data demonstrate transmission ratio distortion at the bl locus when blbl plants are used as both females and males in matings with wild type plants, but the degree of distortion is greater when blbl plants are used as females. Ratio distortion in such crosses may be due to a variety of factors, including increased transmission of the bl gene through female or male gametes depending on the direction of the cross, reduced fitness of maternally derived blbl progeny, epigenetic phenomena, increased fitness of paternally derived blbl progeny, or linkage of the bl gene to viability genes.

scholarly journals LINKAGE CHARACTERIZATION OF RESISTANCE TO ZYMV AND WMV-2 IN THE INBRED CHINESE CUCUMBER LINE TMG-1

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 644f-644
Author(s):  
Thanda Wai ◽  
Jack Staub ◽  
Rebecca Grumet
Keyword(s):  
Inbred Line ◽  
Single Gene ◽  
Recessive Gene ◽  
Single Recessive Gene ◽  
Small Spine ◽  
Recessive Genes ◽  
Linkage Relationships ◽  
Related Potyviruses

TMG-1 is resistant to ZYMV and WMV-2, two closely related potyviruses. Resistance to ZYMV is due to a single recessive gene (Provvidenti, 1987); however, two recessive genes appear to confer resistance to WMV-2. We sought to further characterize the resistances by studying possible linkage relationships with physiological, morphological, electromorphic, and phytopathological markers. TMG-1, WI-2757 (an inbred line susceptible to both viruses), and their F2 progeny were screened for various single gene characters that differ between the two parents. Linkages reported in the literature were also observed in this study: (1) between bitterfree (bi) and female (F), and (2) between numerous spine (ns), small spine (ss), and tuberculate (Tu). New linkages detected were between: (1) resistance to WMV-2 and F, (2) resistance to WMV-2 and ZYMV, and (3) possibly resistance to ZYMV with fusarium and ns.

Genetic analysis of resistance to bacterial blight in rice

Genome ◽  
1988 ◽  
Vol 30 (3) ◽  
pp. 299-302 ◽  
Author(s):  
S. C. Prasad ◽  
J. B. Tomar
Keyword(s):  
Resistance Genes ◽  
Bacterial Blight ◽  
Xanthomonas Campestris ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Susceptible Cultivar ◽  
Inheritance Of Resistance ◽  
Single Recessive Gene ◽  
Clipping Technique ◽  
Mode Of Inheritance

The mode of inheritance of resistance to bacterial blight, Xanthomonas campestris pv. Oryzae was studied in 12 rice cultivars: 'BR51-282-8', 'DV85', 'CAS209', 'Java14', 'IR4613-54-5', 'Zenith', 'IR36', 'Neuli', 'BJ1', 'LZN', 'MRC603-303', and 'D204-1'. These resistance cultivars were crossed with a susceptible tester parent 'TN1'. The plants were inoculated at the maximum tillering stage by the clipping technique. From the reactions of F1, F2, and F3 populations, it was found that resistance in 'LZN', 'MRC603-303', and 'D204-1' was conditioned by a single recessive gene. The resistance in 'BR51-282-8', 'DV85', 'CAS209', 'Javal4', 'IR4613-54-5', 'Zenith', 'IR36', 'Neuli', and 'BJ1' was controlled by a single dominant gene. The allelic relationships of resistance genes in the test cultivars with Xa4 was studied. The Xa4 gene was originally identified and designated in 'IR22'. The resistance genes in the test cultivars were nonallelic to Xa4. The trisomie lines of 'IR36' were crossed with 'Jaya', a highly susceptible cultivar to bacterial blight. The segregation pattern of the F2 and backcross generations revealed that the resistance gene of 'IR36' was located on chromosome 12 of the rice genome.Key words: rice, resistance, bacterial blight, allelic relationship, trisomics.

scholarly journals Adult Plant Leaf Rust Resistance Derived from Toropi Wheat is Conditioned by Lr78 and Three Minor QTL

2018 ◽  
Vol 108 (2) ◽  
pp. 246-253 ◽  
Author(s):  
J. A. Kolmer ◽  
A. Bernardo ◽  
G. Bai ◽  
M. J. Hayden ◽  
S. Chao
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Recombinant Inbred Lines ◽  
Single Gene ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Field Plot ◽  
Plant Leaf

Leaf rust caused by Puccinia triticina is an important disease of wheat in many regions worldwide. Durable or long-lasting leaf rust resistance has been difficult to achieve because populations of P. triticina are highly variable for virulence to race-specific resistance genes, and respond to selection by resistance genes in released wheat cultivars. The wheat cultivar Toropi, developed and grown in Brazil, was noted to have long-lasting leaf rust resistance that was effective only in adult plants. The objectives of this study were to determine the chromosome location of the leaf rust resistance genes derived from Toropi in two populations of recombinant inbred lines in a partial Thatcher wheat background. In the first population, a single gene with major effects on chromosome 5DS that mapped 2.2 centimorgans distal to IWA6289, strongly reduced leaf rust severity in all 3 years of field plot tests. This gene for adult plant leaf rust resistance was designated as Lr78. In the second population, quantitative trait loci (QTL) with small effects on chromosomes 1BL, 3BS, and 4BS were found. These QTL expressed inconsistently over 4 years of field plot tests. The adult plant leaf rust resistance derived from Toropi involved a complex combination of QTL with large and small effects.

A new gene, developed through mutagenesis, for resistance of rice to bacterial leaf blight (Xanthomonas campestris pv. oryzae)

1990 ◽  
Vol 114 (2) ◽  
pp. 219-224 ◽  
Author(s):  
H. Nakai ◽  
K. Nakamura ◽  
S. Kuwahara ◽  
M. Saito
Keyword(s):  
Resistance Genes ◽  
Xanthomonas Campestris ◽  
Recessive Gene ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Thermal Neutrons ◽  
Single Recessive Gene ◽  
Recessive Genes ◽  
New Gene ◽  
Induced Mutant

SUMMARYAn induced mutant of rice, designated M41, resistant to several races of bacterial leaf blight, obtained after irradiation with thermal neutrons, was crossed with the original variety, Harebare. Test crosses revealed that the resistance of M41 to the Japanese races I, II, III and IV is controlled by a single recessive gene, considered to be different from four previously identified dominant resistance genes of japonica-type varieties and from three recessive genes in indica-type varieties for resistance to Philippine races. The gene in M41 was tentatively designated xa-nm(t).

scholarly journals A SINGLE-GENE-DEPENDENT ABNORMALITY OF ADORAL MEMBRANELLES IN TETRAHYMENA PYRIFORMIS, SPECIES 1

Genetics ◽  
1975 ◽  
Vol 81 (4) ◽  
pp. 631-639
Author(s):  
Andrezj Kaczanowski
Keyword(s):  
Exponential Growth ◽  
Genetic Basis ◽  
Single Gene ◽  
Recessive Gene ◽  
Tetrahymena Pyriformis ◽  
Inbred Strains ◽  
Single Recessive Gene ◽  
Normal Pattern ◽  
Allelic Variants ◽  
Abnormal Cells

ABSTRACT Strain D of species (syngen) 1, Tetrahymena pyriformis, differs from other inbred strains in its manifestation of certain abnormal patterns of adoral membranelles. Instead of the usual three membranelles some cells have a greater number, most frequently 4 or 5, but occasionally up to 7. The extra membranelles, or even all membranelles of any given set, are shorter than M-1 and M-2 of the normal pattern. In other cases, the only alteration observed is a change in the relative lengths of the three membranelles. The frequency of abnormal cells varies from about 5% to 15% during exponential growth to over 50% after prolonged stationary culture. The genetic basis for the abnormality is shown to be due to a single recessive gene which segregates normally in various crosses and which manifests vegetative assortment as do most allelic variants in species 1.

scholarly journals (256) Investigation into the Poor Seedling Establishment Trait Associated with Compact Phenotype in PI308916 and Possible Relationship to Apical Hook Formation

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1073A-1073
Author(s):  
Laura Havenga ◽  
Kaori Ando ◽  
Rebecca Grumet
Keyword(s):  
Seedling Establishment ◽  
Single Gene ◽  
Recessive Gene ◽  
Fruit Rot ◽  
Planting Density ◽  
Stem Length ◽  
Single Recessive Gene ◽  
Apical Hook ◽  
Short Internodes ◽  
The Relationship

Cucumber PI308916 has a compact growth habit (short internodes and main stem length) due to a single recessive gene cp. We also observed that this PI has lower incidence of Phytophthora fruit rot, likely due to its upright fruit bearing habit. Previous researchers reported that compact cucumber lines derived from PI308916 exhibited the potential for higher yields due to increased planting density. Despite these potentially beneficial traits, efforts to develop PI308916-derived lines were terminated due to poor seedling establishment. The objective of this research is to determine the relationship between the compact phenotype and poor seedling establishment. Short internodes can be caused by deficiency in gibberellins or brassinosteroids that can also impact germination or apical hook formation, a trait important for seedling emergence from the soil. Germination rate and apical hook angle was recorded for `Wautoma' (control inbred line that forms normal apical hook), PI308916, and their F1, F2, and BC progeny. Germinating `Wautoma' seeds showed consistent, large apical hook angles (mean 147), while hook angles of PI308916 were broadly distributed from 0 to 180 (mean 96). F1 progeny for the reciprocal crosses had a similar angle (mean 134 and 133) to `Wautoma'. Segregation ratios for apical hook angle in the F2 and BC populations were consistent with a single recessive gene. Evaluation of the relationship between the apical hook and compact phenotype, showed an absence of the recombinant class of long internodes and small apical hook angle in the F2 population, suggesting that the two traits may be conferred by a single gene or two tightly linked genes.

Sign in / Sign up

Export Citation Format

Share Document