THE DETERMINATION AND VERIFICATION OF A BASELINE TEMPERATURE FOR THE GROWTH OF WESTAR SUMMER RAPE

1989 ◽  
Vol 69 (2) ◽  
pp. 455-464 ◽  
Author(s):  
M. J. MORRISON ◽  
P. B. E. McVETTY ◽  
C. F. SHAYKEWICH
Keyword(s):  
Temperature Field ◽  
Brassica Napus ◽  
Controlled Environment ◽  
Growing Degree Days ◽  
Degree Days ◽  
Brassica Napus L ◽  
Physiological Maturity ◽  
Phenological Data ◽  
Whole Plant ◽  
Baseline Temperature

Controlled environment growth cabinets set at mean temperatures of 10, 13.5, 15, 17, 20, 22 and 25 °C were used to determine a baseline temperature of 5 °C for the growth of Westar summer rape (Brassica napus L.). Temperatures in excess of 25 °C caused whole plant sterility. Phenological data obtained from ten field sites, collected over three years, was used to verify the 5 °C baseline temperature. Field growing degree days (GDD) and cabinet GDD were not significantly different. The percent development to physiological maturity (% DPM) of field grown Westar summer rape, as influenced by temperature, was not significantly different from that predicted by the cabinet determined equation. The agreement between field and cabinet GDD and observed and predicted % DPM verified the use of a 5 °C baseline temperature in field GDD equations. % DPM and GDD were found to be better estimators of phenological development in the field than calendar days. A simple linear model, relating % DPM to GDD was developed. It was concluded that temperature is the most important environmental factor regulating the phenological development of Westar summer rape in western Canada.Key words: Westar summer rape, Brassica napus, baseline temperature, phenological development, growing degree days

Quantitative analysis of the growth, development and distribution of flowers and pods in oil seed rape (Brassica napus L.)

1975 ◽  
Vol 85 (1) ◽  
pp. 103-110 ◽  
Author(s):  
T. O. Tayo ◽  
D. G. Morgan
Keyword(s):  
Quantitative Analysis ◽  
Brassica Napus ◽  
Growth And Development ◽  
Brassica Napus L ◽  
Flower Opening ◽  
Oil Seed ◽  
Oil Seed Rape ◽  
Whole Plant ◽  
Growth Development

SUMMARYThe growth and development of single plants of oil seed rape, variety Zollerngold, are described quantitatively and particular attention paid to the sequence and pattern of flower and pod production on the different inflorescences. The period of flower opening over the whole plant spanned an average of 26 days and more than 75% of the pods which were retained to maturity were formed from flowers which opened within 14 days of anthesis. Most of these flowers were found on the terminal raceme and on the basal and middle regions of the axillary inflorescences arising from the uppermost three nodes.

Frost damage to canola (Brassica napus L.) during reproductive phase in a controlled environment

Agrometeoros ◽  
2020 ◽  
Vol 27 (2) ◽  
Author(s):  
Samuel Kovaleski ◽  
Arno Bernardo Heldwein ◽  
Genei Antonio Dalmago ◽  
Jorge Alberto de Gouvêa
Keyword(s):  
Brassica Napus ◽  
Frost Damage ◽  
Controlled Environment ◽  
Brassica Napus L ◽  
Reproductive Phase

Comparison of two air temperature based models for predicting phenophase occurrence in Persian lilacs (Syringa chinensis) cultivar Red Rothomagensis

1990 ◽  
Vol 68 (5) ◽  
pp. 1113-1116 ◽  
Author(s):  
Gary W. Moorman ◽  
James L. Rosenberger ◽  
Leslie A. Gladstone
Keyword(s):  
Mathematical Models ◽  
Key Words ◽  
Growth Model ◽  
Air Temperature ◽  
Growing Degree Days ◽  
Bud Break ◽  
Degree Days ◽  
Flower Bud ◽  
Phenological Data ◽  
Vegetative Bud

Phenological data collected for 9–11 years from genetically uniform Persian lilacs (Syringa chinensis L.) cultivar Red Rothomagensis were analyzed to determine whether the number of days elapsed between vegetative bud break and flower bud break is correlated with either the accumulated growing degree-days or the average daily temperature. The lack of statistically significant correlations between these variables suggests these mathematical models cannot accurately predict the onset of flower bud break for this cultivar. Key words: degree-days, growth model, phenology.

EFFECT OF SEED POD LOCATION ON THE FATTY ACID COMPOSITION OF SEED OIL FROM RAPESEED (BRASSICA NAPUS AND B. CAMPESTRIS)

1970 ◽  
Vol 50 (2) ◽  
pp. 151-154 ◽  
Author(s):  
M. BECHYNE ◽  
Z. P. KONDRA
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Brassica Napus ◽  
Acid Composition ◽  
Seed Oil ◽  
Position Effect ◽  
Controlled Environment ◽  
Brassica Napus L ◽  
Seed Position ◽  
Field Plots

Oils from seeds produced at three locations on plants of Nugget (Brassica napus L.) and Echo (B. campestris L.) rapeseed, grown in field plots and a controlled environment room, were analyzed for their fatty acid composition. The fatty acid composition of oil from field-produced seed was not affected by the location of the seed on the plant. However, in the controlled environment room the effect of seed position was significant. Nugget seed from the lowest raceme contained seed oil with significantly higher linolenic acid and lower erucic acid than seed produced on the main raceme. Echo seed from the lowest pods on the main raceme contained significantly less palmitic acid than seeds from the lowest pods on the lowest raceme. Nugget seed grown in the controlled environment room had a significantly higher content of palmitic, stearic and oleic acids, and significantly lower levels of linoleic, linolenic and erucic acids than Nugget field-produced seed. The fatty acid composition of Echo seed oil produced under the two environments did not differ significantly. Single pod samples should be restricted to the same position on each plant to reduce the position effect on fatty acid composition. This and previous studies indicate that comparisons of fatty acid values for plants grown at different locations should be avoided.

Distribution of 14carbon-labelled assimilates in flowering plants of oilseed rape (Brassica napus L.)

1988 ◽  
Vol 111 (2) ◽  
pp. 347-355 ◽  
Author(s):  
D. R. Keiller ◽  
D. G. Morgan
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Flowering Plants ◽  
Flower Buds ◽  
Brassica Napus L ◽  
Whole Plant ◽  
Sink Capacity ◽  
Days After Anthesis ◽  
Plant Basis

SummaryA study has been made of the distribution of 14carbon-labelled assimilates in flowering oilseed rape plants. Up to 10 days after anthesis individual flowers were strong sinks for assimilates for 2 days after opening but thereafter became weak sinks for a period of 24 h. This period coincided with pollination and subsequent fertilization. After fertilization the young pods again became strong sinks. Between 13 and 16 days after anthesis other flower buds, flowers and young pods which had previously been strong sinks failed to attract assimilates and aborted. This fall in sink capacity occurred at about the same time on all branches and appeared to be co-ordinated on a whole-plant basis.

AGRONOMIC PERFORMANCE OF TRIAZINE-RESISTANT SINGLE-CROSS HYBRID OILSEED RAPE (Brassica napus L.)

1985 ◽  
Vol 65 (4) ◽  
pp. 889-892 ◽  
Author(s):  
IAN GRANT ◽  
WALLACE D. BEVERSDORF
Keyword(s):  
Brassica Napus ◽  
Plant Height ◽  
Oilseed Rape ◽  
Agronomic Performance ◽  
Brassica Napus L ◽  
Lodging Resistance ◽  
Physiological Maturity ◽  
Triazine Resistance ◽  
Flowering Date ◽  
Single Cross

The agronomic performance of eight triazine-resistant single-cross oilseed rape (B. napus L.) hybrids was evaluated. The yield of most of the hybrids was significantly greater than Atr-Regent; some of the hybirds demonstrated mid-parent heterosis, but none of the eight exhibited high-parent heterosis. In most cases the hybrids were intermediate to the parents for flowering date, plant height, lodging resistance, physiological maturity, percent oil and percent protein.Key words: Brassica napus L., oilseed rape, F1 hybrid, triazine resistance

Oilseed rape (Brassica napus L.) pod shatter resistance and its relationship with whole plant and pod characteristics

2021 ◽  
Vol 166 ◽  
pp. 113459
Author(s):  
Yiren Qing ◽  
Yaoming Li ◽  
Lizhang Xu ◽  
Zheng Ma ◽  
Xiaoli Tan ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Brassica Napus L ◽  
Whole Plant ◽  
Pod Shatter

A functional leaf may represent the assimilate accumulation characteristics of the whole seedling plant in winter oilseed rape (Brassica napus L.)

2015 ◽  
Vol 66 (8) ◽  
pp. 849 ◽  
Author(s):  
Xinghua Li ◽  
Tewu Yang ◽  
Zhongnan Nie ◽  
Guoxing Chen ◽  
Liyong Hu ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Dry Matter ◽  
Seedling Stage ◽  
Regression Equations ◽  
Winter Oilseed Rape ◽  
Brassica Napus L ◽  
Whole Plant ◽  
Photosynthetic Assimilation ◽  
Accumulation Characteristics

A single functional leaf is usually sampled to evaluate the growth and photosynthetic assimilation of crops. However, there is large variation between leaves in winter oilseed rape (Brassica napus L.) at seedling stage. In this study, the morphological and physiological characteristics of various functional leaves were compared with characteristics of the whole plant at seedling stage for 2 years by using the oilseed rape cultivars Huaza 9 and Huaza 62 as plant material. The aim of this study was to identify a leaf that can represent the whole plant for assimilate accumulation characteristics at the seedling stage of the crop. The results showed that the photosynthetic rate and the contents of non-structural carbohydrates, nutrients and soluble proteins in fourth and fifth leaf of a plant were most closely related to those of the whole plant. The area and dry matter (DM) of all functional leaves were well correlated with those of whole plant, with the fifth leaf having the highest correlations. It is therefore recommended that the fifth leaf is most suitable to represent the whole plant for evaluation of growth and assimilate accumulation for winter oilseed rape at the seedling stage. The following regression equations for whole plant (y) and fifth leaf (x, dry matter or length × width) can be used to predict (1) DM accumulation (g) and (2) total leaf area (cm2) of the whole plant: (1) y = 3.32x + 1.51 (R2 = 0.88, P < 0.001); (2) y = 1.24x + 222.69 (R2 = 0.67, P < 0.001).

scholarly journals Agroclimatic Indices of Rice (Oryza sativa L.) Influenced by Different Planting Times

2020 ◽  
Vol 23 (2) ◽  
pp. 87-94
Author(s):  
A Sultana ◽  
NY Shaikh ◽  
MS Zahan ◽  
R Akter ◽  
SA Islam ◽  
...  
Keyword(s):  
Grain Yield ◽  
Growing Degree Days ◽  
Degree Days ◽  
Phenological Stages ◽  
Physiological Maturity ◽  
Planting Time ◽  
Degree Day ◽  
Advanced Line ◽  
Check Variety ◽  
Use Efficiency

Meteorological variables have an important role in rice production. Considering this study was carried out in Aman season of 2016 at the research field of Bangladesh Rice Research Institute, Gazipur. The research was conducted in order to investigate the effects of planting time on various agrometeorological indices viz., accumulated growing degree days (GDD), heliothermal units (HTU), photo thermal units (PTU), and heat use efficiency (HUE) the yield of advanced/variety grown under different time of transplanting in the Gazipur climatic zone (AEZ, 28). The research was conducted as a split plot using randomized complete block design (RCBD) with three replications. In this research, three planting times (1st Aug, 16th Aug, and 31th Aug) and the Advanced lines/varieties BR (Bio) 9786-BC2-119-1-1, BR (Bio) 9786-BC2-132-1-3 and BRRI dhan49 (check variety) were used in the experiment. The results showed that planting time significantly affected on grain yield. Among the genotypes, BR (Bio) 9786-BC2-119-1-1 and BR (Bio) 9786-BC2-132-1-3 produced significantly higher grain yield than check variety BRRI dhan49 in all the planting times. The variety (BRRI dhan49), transplanted at the first August, took maximum calendar days (136 days) to attain different phenological stages till physiological maturity coupled with highest growing degree days (2420 degree day) for maturity, lowest heat use efficiency (2.25 kg ha-1 c-1 day-1), highest heliothermal units (15141.01 degree day hours) and lowest photothermal units (29678.81 degree day hours) resulting lower yield. Among the advanced lines the line BR (Bio) 9786-BC2-119-1-1 took higher calendar day (134 days) to attain different phenological stages till physiological maturity coupled with higher growing degree days (2393 degree day) for maturity, heat use efficiency (2.76 kg ha-1 c-1 day-1), heliothermal units (13759.75 degree day hours) and photothermal units (30112.51 degree day hours) resulting higher yield. Taken together, the results indicate that the advanced line, BR (Bio) 9786-BC2-119-1-1, could be select as a best advanced line to release as a variety due to its higher grain yield. Bangladesh Rice j. 2019, 23(2): 87-94

Physiological maturity as a function of seed and pod water concentration in spring rapeseed (Brassica napus L.)

2019 ◽  
Vol 231 ◽  
pp. 1-9 ◽  
Author(s):  
Yesica C. Menendez ◽  
Javier F. Botto ◽  
Nora V. Gomez ◽  
Daniel J. Miralles ◽  
Deborah P. Rondanini
Keyword(s):  
Brassica Napus ◽  
Water Concentration ◽  
Brassica Napus L ◽  
Physiological Maturity
Sign in / Sign up

Export Citation Format

Share Document