Selection for fast germination in rapeseed (Brassica napus L. and B. Campestris L.)

Euphytica ◽  
1986 ◽  
Vol 35 (3) ◽  
pp. 835-842 ◽  
Author(s):  
Jane R. King ◽  
Z. P. Kondra ◽  
M. R. Thiagarajah
Keyword(s):  
Brassica Napus ◽  
Brassica Napus L ◽  
Selection For

Association of a RAPD marker with linolenic acid concentration in the seed oil of rapeseed (Brassica napus L.)

Genome ◽  
1995 ◽  
Vol 38 (2) ◽  
pp. 414-416 ◽  
Author(s):  
P. K. Tanhuanpää ◽  
J. P. Vilkki ◽  
H. J. Vilkki
Keyword(s):  
Brassica Napus ◽  
Linolenic Acid ◽  
Acid Concentration ◽  
Seed Oil ◽  
Rapd Marker ◽  
Brassica Napus L ◽  
Breeding Programs ◽  
Selection For ◽  
Rflp Rapd ◽  
Low Linolenic

The F2 progeny (64 individuals) from the cross between oilseed rape (Brassica napus L.) cultivar Topas and R4 (a low linolenic mutation line) was analyzed with 8 RFLPs and 34 RAPDs to discover a genetic tag for gene(s) affecting linolenic acid concentration. According to variance analysis (ANOVA), one RAPD marker (25a) was significantly associated with linolenic acid content; the linolenic acid concentration in the seeds of F2 individuals showing the marker (includes both homo- and hetero-zygotes) was 7.43 ± 1.35% and in those lacking the marker was 5.70 ± 1.52%. Marker 25a may be used to facilitate selection for fatty acid composition in future breeding programs of oilseed rape.Key words: Brassica napus, RFLP, RAPD, linolenic acid.

Genetic analysis of embryo, cytoplasmic, and maternal effects and their environment interactions for protein content in Brassica napus L.

2005 ◽  
Vol 56 (1) ◽  
pp. 69 ◽  
Author(s):  
J. G. Wu ◽  
C. H. Shi ◽  
H. Z. Zhang
Keyword(s):  
Brassica Napus ◽  
Protein Content ◽  
Genetic Model ◽  
Interaction Effects ◽  
Genetic Effects ◽  
Ge Interaction ◽  
Brassica Napus L ◽  
Diallel Mating Design ◽  
Selection For ◽  
Main Effects

A genetic model for quantitative traits of seeds in diploid plants was applied to estimate the genetic main effects and genotype × environment (GE) interaction effects for protein content (PC) of rapeseed (Brassica napus L.) by using 2 years of experimental data with a diallel mating design of 8 parents. Results showed that PC of rapeseed was simultaneously controlled by genetic effects of embryo, cytoplasm, and maternal plant, of which the maternal genetic effects were most important, followed by embryo and cytoplasmic genetic effects. Therefore, improvement of PC of rapeseed would be more efficient when selection is based on maternal plants than that on single seeds. Since the GE interaction effects accounted for about 60.10% of total genetic effect, they were more important than the genetic main effects, and selection for PC might be influenced by environmental conditions. The total narrow-sense heritability for PC was 64.17%, of which the interaction heritability was larger than the general heritability. Selection for improving PC can therefore be conducted in early generations. Maternal heritability (41.59%) was most important for PC, followed by cytoplasmic heritability (17.62%) and then by embryo heritability (5.25%). Based on prediction of genetic effects, parent Youcai 601 was better than others for increasing PC in rapeseed breeding.

MAINTAINERS AND RESTORERS FOR THREE MALE-STERILITY-INDUCING CYTOPLASMS IN RAPE (Brassica napus L.)

1986 ◽  
Vol 66 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Z. Fan ◽  
B. R. STEFANSSON ◽  
J. L. SERNYK
Keyword(s):  
Brassica Napus ◽  
Male Sterility ◽  
Male Fertility ◽  
Extra Chromosome ◽  
Dominant Gene ◽  
Male Sterile ◽  
Brassica Napus L ◽  
Self Pollination ◽  
Selection For ◽  
Restoration Of Fertility

The F1 progenies from crosses involving 32 Brassica napus L. strains (including named cultivars) and male-sterile plants carrying one of the three cytoplasms, ogu, nap, and pol were evaluated for male fertility. All strains were found to be maintainers for the ogu cytoplasm. The fertility of the nap male-sterile plants were fully restored by 30 strains. The cultivar Bronowski partially maintained the nap male sterility, and segregation for male fertility/sterility was observed in the F1 hybrid between nap male sterile plants and the cultivar Lergo. Lergo, therefore, appears to be heterogeneous for genes conditioning maintenance and restoration of this type of male sterility. Most strains were maintainers and the balance were partial maintainers for the pol cytoplasm. The F2 and backcross data obtained under a controlled environment suggest that both the cultivars Karat and Westar possess a single dominant gene for the restoration of fertility in nap cytoplasm. Fertility in the pol cytoplasm was restored in the F1 of crosses between pol B. napus and the B. juncea L. Czern. cultivar ZEM. Five male fertile lines of pol B. napus were selected from the ZEM crosses after five generations of backcrossing to B. napus cultivar Regent and three generations of self-pollination. Selection for fertility during backcrossing and self-pollination resulted in selection for an extra chromosome involved with male fertility restoration.Key words: Rape, Brassica napus L., CMS, maintainers, restorers

GENE ACTION FOR PROTEIN AND OIL CONTENT IN SUMMER RAPE

1977 ◽  
Vol 57 (3) ◽  
pp. 625-631 ◽  
Author(s):  
BAHRAM GRAMI ◽  
B. R. STEFANSSON
Keyword(s):  
Brassica Napus ◽  
Genetic Control ◽  
Oil Content ◽  
Gene Action ◽  
Additive Gene Action ◽  
Brassica Napus L ◽  
Percent Protein ◽  
Additive Gene ◽  
Selection For

Genetic control of percent protein, percent oil, and sum of protein and oil as a percentage of the seed was investigated in two summer rape (Brassica napus L.) cultivars, Midas and Tower, and their F1, F2 and backcross generations. All three traits were found to be governed by additive gene action. Dominance was not significant and epistasis was absent. Selection for sum of protein and oil was shown to be more effective than selection for either protein or oil alone.

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