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

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.

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

Crop and Pasture Science ◽

10.1071/cp14224 ◽

2015 ◽

Vol 66 (8) ◽

pp. 849 ◽

Cited By ~ 3

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).

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Seed Yield and Sulphur Partitioning in Two Inbred Lines of Low and High Glucosinolate Oilseed Rape (Brassica napus L.) and Their Hybrids at Three Levels of Sulphur Supply

Acta Agriculturae Scandinavica Section B - Soil & Plant Science ◽

10.1080/09064719908565565 ◽

1999 ◽

Vol 49 (3) ◽

pp. 184-188

Author(s):

J. Davik ◽

A. K. Bakken

Keyword(s):

Brassica Napus ◽

Oilseed Rape ◽

Seed Yield ◽

Inbred Lines ◽

Brassica Napus L

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Genome Mining and Evaluation of the Biocontrol Potential of Pseudomonas fluorescens BRZ63, a New Endophyte of Oilseed Rape (Brassica napus L.) against Fungal Pathogens

International Journal of Molecular Sciences ◽

10.3390/ijms21228740 ◽

2020 ◽

Vol 21 (22) ◽

pp. 8740

Author(s):

Daria Chlebek ◽

Artur Pinski ◽

Joanna Żur ◽

Justyna Michalska ◽

Katarzyna Hupert-Kocurek

Keyword(s):

Brassica Napus ◽

Plant Growth ◽

Pseudomonas Fluorescens ◽

Oilseed Rape ◽

Plant Growth Promotion ◽

Fungal Pathogens ◽

Growth Promotion ◽

Genome Mining ◽

Plant Colonization ◽

Brassica Napus L

Endophytic bacteria hold tremendous potential for use as biocontrol agents. Our study aimed to investigate the biocontrol activity of Pseudomonas fluorescens BRZ63, a new endophyte of oilseed rape (Brassica napus L.) against Rhizoctonia solani W70, Colletotrichum dematium K, Sclerotinia sclerotiorum K2291, and Fusarium avenaceum. In addition, features crucial for biocontrol, plant growth promotion, and colonization were assessed and linked with the genome sequences. The in vitro tests showed that BRZ63 significantly inhibited the mycelium growth of all tested pathogens and stimulated germination and growth of oilseed rape seedlings treated with fungal pathogens. The BRZ63 strain can benefit plants by producing biosurfactants, siderophores, indole-3-acetic acid (IAA), 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and ammonia as well as phosphate solubilization. The abilities of exopolysaccharide production, autoaggregation, and biofilm formation additionally underline its potential to plant colonization and hence biocontrol. The effective colonization properties of the BRZ63 strain were confirmed by microscopy observations of EGFP-expressing cells colonizing the root surface and epidermal cells of Arabidopsis thaliana Col-0. Genome mining identified many genes related to the biocontrol process, such as transporters, siderophores, and other secondary metabolites. All analyses revealed that the BRZ63 strain is an excellent endophytic candidate for biocontrol of various plant pathogens and plant growth promotion.

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