scholarly journals Variation in Recombination Frequencies in Schizophyllum commune and its Genetic Control

1974 ◽  
Vol 27 (1) ◽  
pp. 103 ◽  
Author(s):  
CY Tang ◽  
ST Chang
Keyword(s):  
Linkage Group ◽  
Genetic Control ◽  
Genetic Factor ◽  
Schizophyllum Commune ◽  
Extensive Study ◽  
Dominant Allele ◽  
Genetic Systems ◽  
I Gene

Several chromosomal segments on the linkage group of the A incompatability factor in S. commune were studied. Recombination frequencies at the dm-9-AIX and AIX-ad-5 regions are controlled by different genetic systems. No evidence of genetic control of recombination is found in the ad-5-Ap region. Extensive study of the recombination frequencies in the region pab-ad-5 revealed that a major genetic factor, rec-I, is involved. The dominant allele of the rec-I gene tends to reduce recom-bination frequencies. The gene is linked to the ad-5 locus at about 20 map units.

scholarly journals NEW MUTATIONS AND A 7-CHROMOSOME LINKAGE MAP OF SCHIZOPHYLLUM COMMUNE

Genetics ◽  
1977 ◽  
Vol 85 (3) ◽  
pp. 417-425
Author(s):  
Carl Frankel ◽  
Albert H Ellingboe
Keyword(s):  
Linkage Group ◽  
Linkage Map ◽  
Group Analysis ◽  
Schizophyllum Commune ◽  
Somatic Recombination ◽  
Linkage Relationships ◽  
New Mutations

ABSTRACT Forty-eight useful new mutations of S. commune were obtained by mutagenesis with N-methyl-N'-nitro-N-nitrosoguanidine. Their requirements and meiotic linkage relationships to each other and previously mapped areas were investigated. Several of these new mutations were incorporated into diploid strains so that the diploids contained at least one marker on every linkage group. Analysis of somatic recombination in these diploids indicated that each meiotic linkage group corresponded to an independent chromosome.

scholarly journals A CLASS OF GENES AFFECTING B FACTOR-REGULATED DEVELOPMENT IN SCHIZOPHYLLUM COMMUNE

Genetics ◽  
1976 ◽  
Vol 82 (3) ◽  
pp. 423-428
Author(s):  
Celia Dubovoy
Keyword(s):  
Genetic Factor ◽  
Schizophyllum Commune ◽  
Nuclear Migration ◽  
Complex Pattern ◽  
Developmental Phase ◽  
Linear Map ◽  
Incompatibility Factor ◽  
Complementation Groups ◽  
Cluster A ◽  
Specific Phase

ABSTRACT Twelve mutations affecting nuclear migration, a major developmental phase in Schizophyllum commune, display a complex pattern of complementation and recombination. They are expressed only when a genetic factor controlling this phase of development, the B incompatibility factor, is operative. All twelve mutations are linked to the B factor, nine in a cluster and three in distinct loci outside the cluster. A linear map cannot be constructed from the frequency of recombination. Complementation maps are not linear. There is little correlation between the complementation groups and the groups based on recombination. Many pairs of mutations that do not complement recombine with frequencies of 1.1% to 26.9%. The genes represented by the twelve mutations are located in a linked group of about 18 known genes involved in the specific phase of development controlled by the B factor.

scholarly journals QTL Across Fruit Development in Red Raspberry, A Study of A Primocane X Biennial Raspberry Population.

2021 ◽  
Author(s):  
Julie Graham ◽  
Kay Smith ◽  
Katrin MacKenzie ◽  
Linda Milne ◽  
Nikki Jennings ◽  
...  
Keyword(s):  
Linkage Group ◽  
Genetic Control ◽  
Fruit Ripening ◽  
Fruit Development ◽  
Developmental Stages ◽  
Developmental Process ◽  
Linkage Groups ◽  
Red Raspberry ◽  
Ripening Process ◽  
Second Year

Abstract Background The changing climate is altering timing of key fruit ripening processes and increasing the occurrence of fruit defects. This work aimed to expand our knowledge of the genetic control of the ripening process in raspberry by examining a biennial x primocane F1 population to determine if the progeny exhibited both primocane and biennial flowering modes, which if any was dominant, and to identify QTL and genome locations associated with fruit development to understand how developmental control in this population differs from a biennial x biennial F1 population previously studied. Results The progeny from this biennial x primocane population exhibited primocane fruiting completing their lifecycle in a single season and also fruiting on second-year wood not removed in season one. QTL associated with rate of fruit development were identified on both primocane and fruiting canes with both parents impacting. Conclusions Novel QTL associated with the developmental process of primocane fruiting were identified. These in the main, differed from developmental QTL for similar developmental stages on fruiting canes (second year canes) with only one significant overlap on linkage group 6. In general, the process of development on fruiting canes overall differed from that in a biennial x biennial population, with the differences being greatest on linkage groups 3 and 6 suggesting control of development differs in the different fruiting types. Further understanding will be achieved by examining genome regions linked to QTL to allow breeding to meet climate requirements for yield stability.

Identification and mapping of a third blackleg resistance locus in Brassica napus derived from B. rapa subsp. sylvestris

Genome ◽  
2008 ◽  
Vol 51 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Fengqun Yu ◽  
Derek J. Lydiate ◽  
S. Roger Rimmer
Keyword(s):  
Brassica Napus ◽  
Linkage Group ◽  
Resistance Gene ◽  
Leptosphaeria Maculans ◽  
Resistance Locus ◽  
Dominant Allele ◽  
Breeding Lines ◽  
Disease Reaction ◽  
Blackleg Resistance ◽  
Map Location

The spectrum of resistance to isolates of Leptosphaeria maculans and the map location of a new blackleg resistance gene found in the canola cultivar Brassica napus ‘Surpass 400’ are described. Two blackleg resistance genes, LepR1 and LepR2, from B. rapa subsp. sylvestris and introgressed in B. napus were identified previously. ‘Surpass 400’ also has blackleg resistance introgressed from B. rapa subsp. sylvestris. Using 31 diverse isolates of L. maculans, the disease reaction of ‘Surpass 400’ was compared with those of the resistant breeding lines AD9 (which contains LepR1), AD49 (which contains LepR2), and MC1-8 (which contains both LepR1 and LepR2). The disease reaction on ‘Surpass 400’ was different from those observed on AD9 and MC1-8, indicating that ‘Surpass 400’ carries neither LepR1 nor both LepR1 and LepR2 in combination. Disease reactions of ‘Surpass 400’ to most of the isolates tested were indistinguishable from those of AD49, which suggested ‘Surpass 400’ might contain LepR2 or a similar resistance gene. Classical genetic analysis of F1 and BC1 plants showed that a dominant allele conferred resistance to isolates of L. maculans in ‘Surpass 400’. The resistance gene, which mapped to B. napus linkage group N10 in an interval of 2.9 cM flanked by microsatellite markers sR12281a and sN2428Rb and 11.7 cM below LepR2, was designated LepR3. A 9 cM region of the B. napus genome containing LepR3 was found to be syntenic with a segment of Arabidopsis chromosome 5.

scholarly journals GENETIC CONTROL OF RECOMBINATION IN SCHIZOPHYLLUM COMMUNE: LOCATION OF A GENE CONTROLLING B-FACTOR RECOMBINATION

Genetics ◽  
1973 ◽  
Vol 74 (1) ◽  
pp. 55-62
Author(s):  
Y Koltin ◽  
Judith Stamberg
Keyword(s):  
Genetic Control ◽  
Recombination Frequency ◽  
Schizophyllum Commune ◽  
Morphological Marker ◽  
Incompatibility Factor

ABSTRACT In S. commune the frequency of recombination between the two subunits, α and β, of the B incompatibility factor is genetically controlled. Analysis of the progeny obtained from crosses between high- and low-recombining strains indicates that the gene controlling recombination frequency in the B factor is linked to the B factor itself, approximately nine map units from Bβ. This gene, called B-rec-1, does not affect the recombination frequency in an unlinked region (between the subunits of the A incompatibility factor) or in a region contiguous with the B factor (between Bα and the morphological marker dome-2).

scholarly journals GENETIC CONTROL OF BONE MARROW GRAFT REJECTION

1971 ◽  
Vol 134 (1) ◽  
pp. 281-293 ◽  
Author(s):  
Gustavo Cudkowicz
Keyword(s):  
Bone Marrow ◽  
Linkage Group ◽  
Genetic Control ◽  
Graft Rejection ◽  
Bone Marrow Cells ◽  
Marrow Graft ◽  
Group V ◽  
Group I ◽  
C3h Mice ◽  
Regulator Genes

Transplantation of 5 x 105 DBA/2 (H-2d) bone marrow cells into irradiated B10 and 129-strain mice (both H-2b) resulted in graft failure in the first recipient strain and in graft take in the second. Transplantation of B10 (H-2b) cells into irradiated B10.BR and C3H mice (both H-2k) also resulted in failure in the congenic B10.BR recipients and take in the C3H mice. Resistance and susceptibility of B10 and 129-strain animals were specific for given H-2 alleles of donor cells. Transplantation of DBA/2 marrow into (B10 x 129)F2 mice and of B10 marrow into (B10.BR x C3H)F1 x C3H backcross mice revealed definite genetic control of the graft-rejection process, presumably at the level of alloantigen recognition. Resistance to allografts, or responder status, was conferred upon segregating mice by dominant alleles of two major independent autosomal loci. The effects of the loci were additive. Conversely, susceptibility to allografts, or nonresponder status, was due to the apparently recessive alleles of both loci. None of the genes was closely linked with the markers tf (tufted) and T (brachyury) of linkage group IX, Aw (white-bellied agouti) of linkage group V, Sl (steel) of linkage group IV, and cch (chinchilla) and p (pink eye, dilute) of linkage group I. There were suggestions, however, that the regulator genes of marrow graft rejection are either non-H-2 histocompatibility genes or other genetic factors closely linked with them.

THE GENETIC CONTROL OF SUNFLOWER SEED ACID PHOSPHATASE

1976 ◽  
Vol 18 (4) ◽  
pp. 709-716 ◽  
Author(s):  
Andrew M. Torres ◽  
Ulrike Diedenhofen
Keyword(s):  
Molecular Weight ◽  
Acid Phosphatase ◽  
Linkage Group ◽  
Molecular Marker ◽  
Alcohol Dehydrogenase ◽  
Helianthus Annuus ◽  
Genetic Control ◽  
Sunflower Seed ◽  
Single Gene ◽  
Genetic Studies

Genetic studies indicate that the acid phosphatase isozymes in seeds of the annual sunflower (Helianthus annuus) are specified by a single gene, Acp, having at least four codominant alleles, S, B, I and F. The enzyme is presumably dimeric. The polypeptide subunits in heterozygotes form an intragenic heterodimer in addition to two homodimers. Acp is not linked to either of the genes coding for seed alcohol dehydrogenase, Adh-1 and Adh-2, and these are not linked to each other. Acp therefore provides a molecular marker for a third sunflower linkage group. The estimated molecular weight of the intact, functional enzyme is about 95,000 daltons.

Sign in / Sign up

Export Citation Format

Share Document