scholarly journals Genetic behaviour of qualitative and seed yield-related traits in Brassica rapa

2017 ◽  
Vol 104 (2) ◽  
pp. 147-156 ◽  
Author(s):  
Aamer Mumtaz ◽  
Hafeez Ahmad Sadaqat ◽  
Muhammad Saeed ◽  
Muhammad Irfan Yousaf ◽  
Aamar Shehzad ◽  
...  
Keyword(s):  
Brassica Rapa ◽  
Seed Yield ◽  
Genetic Behaviour

Effect of preharvest applications of glyphosate on the drying, yield and quality of canola

2000 ◽  
Vol 80 (2) ◽  
pp. 433-439 ◽  
Author(s):  
A. L. Darwent ◽  
K. J. Kirkland ◽  
L. Townley-Smith ◽  
K. N. Harker ◽  
A. J. Cessna
Keyword(s):  
Brassica Rapa ◽  
Seed Yield ◽  
Seed Quality ◽  
Canola Seed ◽  
Moisture Contents ◽  
Yield And Quality ◽  
Seed Moisture ◽  
Seed Content ◽  
Seed Yields

Potential use of preharvest applications of glyphosate in canola (Brassica rapa L.) in western Canada both as a harvest aid and to control weeds prompted this study. Experiments were conducted from 1988 to 1990 at four locations in the region to document the effectiveness of preharvest applications of glyphosate to enhance canola seed and foliage drydown and to measure the effect of such applications on seed yield and quality. Glyphosate was applied in early August to early September at rates of 0.45, 0.90 and 1.70 kg acid equivalent ha−1 to canola with seed moisture contents ranging from 79 to 12%. Seed and foliage moisture drydown were not enhanced by glyphosate treatment. Glyphosate treatments generally had little or no effect on canola seed yields, seed weight, seed germination, green seed content or oil content except when applied when the pods were green and when seed moisture contents were high. Seed/pod moisture was not a reliable indicator of stage of canola development and thus, should not be used alone as an indicator of when preharvest applications of glyphosate can be applied to canola without decreasing seed yield and quality. Key words: Glyphosate, canola, Brassica rapa L., preharvest application, desiccation, seed quality

Eldorado summer turnip rape

1993 ◽  
Vol 73 (1) ◽  
pp. 185-186
Author(s):  
D. F. Degenhardt ◽  
G. R. Stringam ◽  
Z. P. Kondra
Keyword(s):  
Brassica Rapa ◽  
Seed Yield ◽  
Oil Content ◽  
Seed Oil ◽  
Glucosinolate Content ◽  
Western Canada ◽  
Seed Oil Content ◽  
Turnip Rape ◽  
Cultivar Description ◽  
Canola Quality

Eldorado summer rape (Brassica rapa L.) is a canola-quality cultivar with a seed yield similar to that of Tobin. The seed oil content of Eldorado is significantly higher and its meal glucosinolate content is significantly lower than Tobin. Eldorado is well adapted to the B. rapa-growing areas of western Canada. Keywords: Turnip rape (summer), cultivar description

A greater relative growth rate of Brassica rapa L. at low temperatures increases biomass at anthesis

2001 ◽  
Vol 52 (6) ◽  
pp. 645 ◽  
Author(s):  
P. Si ◽  
N. Thurling
Keyword(s):  
Growth Rate ◽  
Brassica Rapa ◽  
Seed Yield ◽  
Negative Correlation ◽  
Low Temperatures ◽  
Leaf Tissue ◽  
Dry Weight ◽  
Controlled Environment ◽  
Relative Growth ◽  
Potassium Leakage

0t, n.s.). These relationships suggested that it might be possible to develop early flowering cultivars with increased seed yield by selecting for higher RGR before anthesis. RGR of BC 2 F 3:4 lines in the field during winter was correlated with RGR at low temperatures (13/4°C) in a controlled environment, suggesting that genotypes producing more dry weight at anthesis grew more at the low temperatures normally experienced in the field. This was supported by a significant (P < 0.05 0.05) negative correlation (r = –0.69**) between growth in the field and potassium leakage from leaf tissue at 4

Growth and yield of doubled haploid lines of oilseed Brassica rapa

1998 ◽  
Vol 78 (4) ◽  
pp. 537-544 ◽  
Author(s):  
D. B. Dewan ◽  
G. Rakow ◽  
R. K. Downey
Keyword(s):  
Brassica Rapa ◽  
Seed Yield ◽  
Doubled Haploid ◽  
Field Tests ◽  
Field Evaluation ◽  
Growth And Yield ◽  
Consistent Performance ◽  
Delayed Flowering ◽  
Dh Lines ◽  
Number Of Seeds

The production of doubled haploid (DH) lines of Brassica rapa could be an efficient procedure for the development of inbred parents for hybrid production. A total of 162 B. rapa DH lines were evaluated in field tests at Saskatoon, Canada, in single row, replicated tests and 10 DH lines were tested in four-row plot, multilocation, replicated tests. Seed of DH lines was produced by bud selfing in the greenhouse. Approximately one-fifth of all DH lines tested were chlorophyll deficient, presumably due to the expression of recessive alleles. Inbreeding depression was evident in low seed and biological yields, low number of seeds per pod and delayed flowering. Seed yield of DH lines was positively associated with the number of seeds per pod, early flowering and a long pod-filling period. One DH line was equal in yield to its donor population (DP), suggesting that dominance deviation was the genetic basis for high seed yield in this species. The consistent performance of DH lines over years and locations indicated that DH lines may be selected after 1 year of evaluation for combining ability testing. Higher yielding DH lines of B. rapa must be selected before they can be used as parents for hybrid development. Key words: Brassica rapa, doubled haploid, field evaluation

Seed yield of successive synthetic generations in summer turnip rape

2003 ◽  
Vol 83 (2) ◽  
pp. 271-274 ◽  
Author(s):  
K. C. Falk ◽  
D. L. Woods
Keyword(s):  
Key Words ◽  
Brassica Rapa ◽  
Seed Yield ◽  
Brassica Campestris ◽  
Relative Order ◽  
Turnip Rape ◽  
Cultivar Groups ◽  
Rapeseed Cultivar ◽  
Canola Quality

One Canadian turnip rapeseed cultivar and four canola-quality strains were used as parents to create 10 two-parent synthetics to assess the performance of successive synthetic generations and determine whether the planting of the Syn0 generation is an alternative to either the Syn1 generation or a single parental planting in summer turnip rape. Parents, as a group, yielded significantly less than Syn0s, Syn1s and Syn2s. The relative order of cultivar groups was consistent over environments (i.e., Syn1 ≥ Syn2 ≥ Syn0 ≥ parents). Key words: Turnip rape (summer), synthetic, Brassica rapa, Brassica campestris

The utilization of heterosis for seed yield in hybrid and synthetic cultivars of summer turnip rape

1998 ◽  
Vol 78 (3) ◽  
pp. 383-387 ◽  
Author(s):  
K. C. Falk ◽  
G. F. W. Rakow ◽  
R. K. Downey
Keyword(s):  
Brassica Rapa ◽  
Seed Yield ◽  
Prediction Method ◽  
Yield Potential ◽  
Turnip Rape ◽  
Hand Pollination ◽  
Pollination Control ◽  
Synthetic Hybrids ◽  
Actual Yield ◽  
Synthetic Cultivars

Hybrids of summer turnip rape (Brassica rapa L. syn. B. campestris L.) have been shown to exhibit high levels of heterosis. This study was undertaken to determine whether the heterosis for seed yield observed in hybrids could be captured by synthetic cultivars of turnip rape. The agronomic performance of reciprocal inter-cultivar hybrids and their corresponding two-component synthetics was studied using four turnip rape cultivars. Hybrid seed was produced by hand pollination in the greenhouse and Syn1 seed was produced by mixing equal proportions of each parent to form the base seed (Syn0) of each synthetic, and planting these in isolation in the field. The seed yield of hybrids, synthetics and parents were similar in 1985 while in 1986, hybrids yielded 25% and synthetics 23% more than parents. Actual versus predicted synthetic yields were similar except for one synthetic, Echo-Torch in 1986, where the actual yield exceeded the predicted value. Hybrid yields may have been underestimated by the chosen prediction method and therefore the yield potential of hybrids would be greater than for synthetics in turnip rape. However, until a suitable pollination control system is developed in this species, synthetic cultivars are a viable alternative to hybrids. Key words: Turnip rape (summer), synthetic, hybrids, Brassica rapa, B. campestris

scholarly journals Genetic variability, character association and path analysis in Brassica rapa L. Genotypes

2015 ◽  
Vol 40 (2) ◽  
pp. 305-323
Author(s):  
S Naznin ◽  
MA Kawochar ◽  
S Sultana ◽  
MSR Bhuiyan
Keyword(s):  
Path Analysis ◽  
Brassica Rapa ◽  
Seed Yield ◽  
Selection Criteria ◽  
Significant Positive Correlation ◽  
Path Coefficient ◽  
Early Maturity ◽  
Character Association ◽  
High Heritability ◽  
Genotypic Coefficient Of Variation

Thirty three genotypes of Brassica rapa L. were evaluated in order to find out their inter-genotypic variability; character association and path coefficient of seed yield/plant and its component characters. BARI sarisha-6 x TORI-7 S-45 showed best result in terms of early maturity (75 days) and higher seed yield/plant (5.28g) than check varieties. The character, plant height, was highly influenced by the environment whereas, all other characters influenced the least. Number of secondary branches/plant showed the highest phenotypic and genotypic coefficient of variation. Moreover, number of siliquae/plant, number of secondary branches/plant and number of primary branches/plant showed high heritability (93.16%, 75.69% and 68.03%, respectively) couple with high genetic advance in percent of mean (37.74%, 73.55% and 26.82%, successively). The seed yield/plant showed significant positive correlation with number of siliquae/plant (rg = 0.7011**, rp = 0.5684**), number of primary branches/plant (rg = 0.5611**, rp = 0.4016*) and number of secondary branches/plant (rg = 0.5160**, rp = 0.4098*) revealing that selection based on these traits would be judicious. Path analysis showed that the number of siliquae/plant (0.4679), number of primary branches/plant (0.2823) and number of secondary branches/plant (0.0092) were the most important contributors to seed yield/plant. The results indicated that number of siliquae/plant, number of primary branches/plant and number of secondary branches/plant can be used as selection criteria to increase seed yield/plant in rapeseed.Bangladesh J. Agril. Res. 40(2): 305-323 June 2015

scholarly journals Deciphering the transcriptional regulatory networks that control size, color, and oil content in Brassica rapa seeds

2020 ◽  
Author(s):  
Yue Niu ◽  
Limin Wu ◽  
Yanhua Li ◽  
Hualei Huang ◽  
Mingchao Qian ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Transcription Factor ◽  
Brassica Rapa ◽  
Seed Yield ◽  
Oil Content ◽  
Target Genes ◽  
Regulatory Mechanisms ◽  
Great Promise ◽  
Seed Color ◽  
Brassica Crops

Abstract Background Brassica rapa is an important oilseed and vegetable crop species and is the A subgenome donor of two important oilseed Brassica crops, Brassica napus and Brassica juncea. Although seed size (SZ), seed color (SC), and oil content (OC) substantially affect seed yield and quality, the mechanisms regulating these traits in Brassica crops remain unclear. Results We collected seeds from a pair of B. rapa accessions with significantly different SZ, SC, and OC at seven seed developmental stages (every 7 days from 7 to 49 days after pollination), and identified 24,835 differentially expressed genes (DEGs) from seven pairwise comparisons between accessions at each developmental stage. K-means clustering identified a group of cell cycle-related genes closely connected to variation in SZ of B. rapa. A weighted correlation analysis using the WGCNA package in R revealed two important co-expression modules comprising genes whose expression was positively correlated with SZ increase and negatively correlated with seed yellowness, respectively. Upregulated expression of cell cycle-related genes in one module was important for the G2/M cell cycle transition, and the transcription factor Bra.A05TSO1 seemed to positively stimulate the expression of two CYCB1;2 genes to promote seed development. In the second module, a conserved complex regulated by the transcription factor TT8 appear to determine SC through downregulation of TT8 and its target genes TT3, TT18, and ANR. Further, upregulation of genes involved in triacylglycerol biosynthesis and storage in the seed oil body may increase OC. We further validated the accuracy of the transcriptome data by quantitative real-time PCR of 15 DEGs. Finally, we used our results to construct detailed models to clarify the regulatory mechanisms underlying variations in SZ, SC, and OC in B. rapa. Conclusions This study based on transcriptome comparison provides insight into the regulatory mechanisms underlying the variations of SZ, SC, and OC in plants. The findings hold great promise for improving seed yield, quality and OC through genetic engineering of critical genes in future molecular breeding.

Direction of the breeding of surpits in Federal Scientific Center for Forage Production and Agroecology named after V.R.Williams

2020 ◽  
Author(s):  
V.T. Volovik ◽  
◽  
S.E. Sergeeva ◽  
T.V. Leonidova ◽  
L.M. Korovina
Keyword(s):  
Brassica Rapa ◽  
Seed Yield ◽  
Fat Content ◽  
Fiber Content ◽  
Forage Production ◽  
Scientific Center ◽  
Growing Period ◽  
Breeding Work ◽  
High Standards

As a result of breeding work in FWTC FPA created by varieties of spring (Svetlana, Nadezhda) and winter Brassica rapa (Sarja) with a fiber content of between 6.4 and 7.3%, fat content of 43.2-46.7% protein 23.5-24.5 cm%, a growing period of 76-88 days, seed yield between 2.5 (spring) to 3.5 t/ha (winter). The low content of glucosinolates and fiber in seeds allows the use of cake and meal in the diets of animals and poultry in high standards. The created varieties are in demand by production.

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