Yield potential of spring turnip rape synthetics and composite hybrids compared with open-pollinated commercial cultivars

2006 ◽  
Vol 86 (3) ◽  
pp. 693-700 ◽  
Author(s):  
T. Niemelä ◽  
M. Seppänen ◽  
L. Jauhiainen ◽  
U. Tulisalo
Keyword(s):  
Erucic Acid ◽  
Brassica Rapa ◽  
Seed Yield ◽  
Yield Potential ◽  
Turnip Rape ◽  
Commercial Cultivars ◽  
Low Erucic Acid ◽  
Seed Yields ◽  
High Degree ◽  
First Time

Yield potentials of spring turnip rape (Brassica rapa L.) synthetics and composite hybrids were compared with those of open-pollinated commercial cultivars during a 3-yr period (2000–2002). The trials included 16 synthetics and 25 composite hybrids derived from 22 different parent lines, as well as five open-pollinated commercial cultivars. All of the material tested had low erucic acid and glucosinolate contents and was well adapted for cultivation in southern Finland. The composite hybrids, which were tested for the first time in turnip rape, exhibited significantly higher seed yields than open-pollinated cultivars. The maximum commercial heterosis in seed yield was 18% in synthetics and 23% in composite hybrids. Both synthetics and composite hybrids showed better resistance to lodging than commercial cultivars. When studying the effect of commercial heterosis on seed yield, a high degree of variation was observed both within the synthetics and the composite hybrids. This result highlights the importance of testing parental combinations in turnip rape in order to find combinations that give the strongest heterotic effect. Key words: Turnip rape, Brassica rapa, synthetic, composite hybrid, seed yield, commercial heterosis

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

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

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

Chemical Manipulation of Grass Seed Crops

1985 ◽  
Vol 2 ◽  
pp. 9-14
Author(s):  
J.G. Hampton ◽  
T.G.A. Clemence ◽  
B.L. Mccloy
Keyword(s):  
Seed Yield ◽  
Perennial Ryegrass ◽  
Leaf Tissue ◽  
Yield Potential ◽  
Seed Abortion ◽  
Growth Retardants ◽  
Grass Seed ◽  
Poor Seed ◽  
Seed Crops ◽  
Seed Yields

The seed yield potential established at anthesis in grass seed crops is usually 5-10 times greater than actual seed yields realised at harvest. Losses in seed yield between anthesis and harvest result primarily from the death of fertile tillers and poor seed site utilisation. Lodging has been identified as one of the most important factors reducing seed yields, and the use of growth retardants has significantly increased seed yield in perennial ryegrass and tall fescue. The effects of the growth retardant paclobutrazol on the growth, development and seed yield of perennial ryegrass (Lolium perenne) are presented and discussed. Little is known of the effects of leaf and stem diseases on grass seed yields. Recent research has found that fungicide application can substantially increase seed yield in perennial ryegrass through delaying senescence of leaf tissue. Increased leaf area duration is associated with a reduction in seed abortion, resulting in more seeds per spikelet at harvest. The possibilities for fungicide use in the crop are discussed. Keywords: Seed production, grasses, fertile tillers, seed abortion, growth retardants, paclobutrazol, fungicide, senescence.

Assessment of agronomic performance and heterosis for agronomic traits in hybrid high erucic acid rapeseed (HEAR)

2009 ◽  
Vol 89 (2) ◽  
pp. 227-237 ◽  
Author(s):  
R. D. Cuthbert ◽  
G. Crow ◽  
P. B. E. McVetty
Keyword(s):  
Brassica Napus ◽  
Erucic Acid ◽  
Seed Yield ◽  
Agronomic Traits ◽  
Brassica Napus L ◽  
High Erucic Acid ◽  
High Erucic Acid Rapeseed ◽  
Days To Maturity ◽  
The University ◽  
Seed Yields

Twelve genetically diverse and geographically distinct high erucic acid rapeseed (HEAR) Brassica napus L. cultivars/lines were selected and crossed by hand emasculation in a topcross design to produce 45 F1 hybrid combinations. Seven of the twelve parents were HEAR cultivars/lines developed by the University of Manitoba (UM) and the remaining five parents were proprietary European (EU) HEAR cultivars/lines. Adequate seed was produced to evaluate the hybrids and parents in replicated yield trials in six environments in Manitoba during 2004 and 2005. Vigor, days to first flower, days to maturity, lodging, plant height, and seed yield were assessed. The hybrids were generally more vigorous, taller and more lodging resistant than their parents with similar days to first flower and days to maturity as their earlier parents. The best hybrids in this study displayed high parent heterosis for seed yield of up to 143% and commercial heterosis for seed yield of up to 99%. These hybrids were from the most genetically diverse UM × EU crosses. HEAR hybrids appear very promising approach to increase seed yields in this crop. Key words: Brassica napus L., HEAR, heterosis, hybrids, genetic diversity

scholarly journals Adaptation of Lentil to the Mediterranean Environment. I. Factors Affecting Yield Under Drought Conditions

1993 ◽  
Vol 29 (1) ◽  
pp. 9-19 ◽  
Author(s):  
S. N. Silim ◽  
M. C. Saxena ◽  
W. Erskine
Keyword(s):  
Drought Stress ◽  
Flowering Time ◽  
Seed Yield ◽  
Ground Cover ◽  
Farming Systems ◽  
Yield Potential ◽  
Mediterranean Environment ◽  
Early Maturity ◽  
Selection For ◽  
Seed Yields

SummaryLentil frequently suffers from drought stress towards the end of the growing season in rainfed Mediterranean farming systems. This study aimed to quantify the contribution of yield potential under irrigated conditions and of drought escape to the adaptation of lentils to drought, and to identify traits of value in selection for adaptation to a rain-fed Mediterranean environment. Twenty-five diverse lentil lines were sown under both irrigated and rainfed conditions in the 1987/88 and 1988/89 seasons in northern Syria. In 1987/88 the total seasonal rainfall was 403 mm and average rainfed biomass and seed yields were 5.0 and 1.8 t ha-l, respectively. In contrast, in 1988/89 the total season rainfall was 180 mm and average biomass and seed yields were only 0.67 and 0.12 t ha-1, respectively. Early vigour (estimated as a visual score) and percentage ground cover were strongly associated with final biomass, and were of value in predicting economic yield (seed + straw). Early maturity was correlated with seed yield. In the dry season 1988/89, 49% of the variation in seed yield among lines was accounted for by variation in flowering time. Drought escape was clearly the key response to drought. For severely drought-prone areas, selection for early flowering is therefore required. Variation in flowering time and seed yield under irrigated conditions accounted for 62% of seed yield variation under drought stress.

scholarly journals Variability, Correlation and Path Analysis in F2 Progenies of Inter-Varietal Crosses of Brassica Rapa

2015 ◽  
Vol 6 (1) ◽  
pp. 217-220
Author(s):  
S Ara ◽  
S Afroz ◽  
MS Noman ◽  
MSR Bhuiyan ◽  
MIK Zia
Keyword(s):  
Plant Height ◽  
Brassica Rapa ◽  
Seed Yield ◽  
Yield Potential ◽  
Genetic Advance ◽  
High Heritability ◽  
Correlation And Path Analysis ◽  
Positive Direct ◽  
Number Of Branches ◽  
Plant Length

Eight F2 populations generated through inter-varietal crosses, along with three check varieties of Brassica rapa were evaluated to study the variation in different characters, correlation between pairs of different characters and the direct and indirect effect of different characters on seed yield per plant to select the plants with higher yield potential. From the values of mean, range and (CV%) of seed yield and yield contributing characters it was confirmed that there were considerable variation present among all the genotypes used in the experiment. The values of phenotypic variances were higher than the cor responding genotypic variances. Number of branches per plant, length of siliqua, seeds per siliqua, 1000 seed weight and yield per plant showed least difference between phenotypic and genotypic variances. The values of GCV and PCV indicated that there was least variation present among most of the characters studied. The number of branches per plant, days to 50% flowering, days to maturity and length of siliqua had showed high heritability with low genetic advance and genetic advance in percentage of mean. Yield per plant had significant and highest positive correlation with plant height, days to 50% maturity, length of siliqua and seeds per siliqua. The path co-efficient analysis revealed that siliqua per plant had the highest positive direct effect followed by seeds per siliqua, length of siliqua and plant height. Sixteen most promising plants with higher yield were selected for cultivation.DOI: http://dx.doi.org/10.3329/jesnr.v6i1.22068 J. Environ. Sci. & Natural Resources, 6(1): 217-220 2013

Marker-assisted selection of low erucic acid quantity in short duration Brassica rapa

Euphytica ◽  
2015 ◽  
Vol 208 (3) ◽  
pp. 535-544 ◽  
Author(s):  
Md. Masud Karim ◽  
Nazmoon Naher Tonu ◽  
Mohammad Shakhawat Hossain ◽  
Taketo Funaki ◽  
M. Bahadur Meah ◽  
...  
Keyword(s):  
Erucic Acid ◽  
Short Duration ◽  
Brassica Rapa ◽  
Marker Assisted Selection ◽  
Low Erucic Acid ◽  
Selection Of
Sign in / Sign up

Export Citation Format

Share Document