Impacts of fire cues on germination of Brassica napus L. seeds with high and low secondary dormancy

Plant Biology ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 647-654
Author(s):  
A. Shayanfar ◽  
F. Ghaderi‐Far ◽  
R. Behmaram ◽  
A. Soltani ◽  
H. R. Sadeghipour
Keyword(s):  
Brassica Napus ◽  
Brassica Napus L ◽  
Secondary Dormancy

Classification of canola (Brassica napus) winter cultivars by secondary dormancy

2009 ◽  
Vol 89 (4) ◽  
pp. 613-619 ◽  
Author(s):  
S Gruber ◽  
K Emrich ◽  
W Claupein
Keyword(s):  
Cluster Analysis ◽  
Brassica Napus ◽  
Environmental Factors ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Canola Seed ◽  
Brassica Napus L ◽  
Secondary Dormancy ◽  
Specific Trait

Secondary dormancy is the major reason for seed persistence of canola (Brassica napus L.) in the soil. Volunteers emerging from the soil seed bank can lead to unwanted gene dispersal. More than 40 B. napus canola cultivars were tested for secondary dormancy under laboratory conditions. All cultivars were classified into groups of low, medium, and high dormancy by performing a cluster analysis. The results suggest that secondary dormancy is a cultivar-specific trait. Additionally, inter-year variation in dormancy indicates that it seems to be influenced by a set of environmental factors. Among years, classification of cultivars based on relative rank was more robust than classification based on absolute dormancy values. The classification of cultivars by their dormancy level would allow farmers to select and grow low-dormancy cultivars. Knowledge about the relative secondary dormancy of the currently grown cultivars could help growers and breeders lower canola seed bank persistence. Key words: Brassica napus, cluster analysis, genotype, secondary dormancy, soil seed bank

scholarly journals A transcriptome analysis reveals a role for the indole GLS-linked auxin biosynthesis in secondary dormancy in rapeseed (Brassica napus L.)

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Lei Liu ◽  
Fuxia Liu ◽  
Jinfang Chu ◽  
Xin Yi ◽  
Wenqi Fan ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Transcriptome Analysis ◽  
Auxin Biosynthesis ◽  
Brassica Napus L ◽  
Secondary Dormancy

Water stress, temperature regimes and light control induction, and loss of secondary dormancy in Brassica napus L. seeds

2017 ◽  
Vol 27 (3) ◽  
pp. 217-230 ◽  
Author(s):  
Elias Soltani ◽  
Sabine Gruber ◽  
Mostafa Oveisi ◽  
Nader Salehi ◽  
Iraj Alahdadi ◽  
...  
Keyword(s):  
Water Stress ◽  
Brassica Napus ◽  
High Potential ◽  
Brassica Napus L ◽  
Genetic Potential ◽  
Secondary Dormancy ◽  
Temperature Regimes ◽  
Depth Of Burial ◽  
Dormancy Induction ◽  
Medium Potential

AbstractThis study investigated the induction and loss of dormancy in oilseed rape (Brassica napus). Twenty genotypes were preliminary screened; from these, two genotypes, RGS003 and Hayola 308, which possess high potential for dormancy induction (HSD) and medium potential to induce secondary dormancy (MSD), were selected. The stratification of seeds at alternating temperatures of 5–30°C (in dark) significantly relieved secondary dormancy, but dormancy was not fully released. The ψb(50) values were −1.05 and −1.06 MPa for the MSD and the HSD before dormancy induction. After inducing dormancy, the ψb(50) values for the MSD and the HSD were increased to −0.59 and −0.01 on day 0 stratification at 20°C. The hydrothermal time (θHT) value was low for one-day stratification for HSD in comparison with other stratification treatments. Water stress can induce dormancy (if the seeds have the genetic potential for secondary dormancy) and warm stratification (in dark) can only reduce the intensity of dormancy. The seeds with a high potential of dormancy induction can overcome dormancy at alternating temperatures and in the presence of light. It can, therefore, be concluded that a portion of seeds can enter the cycle of dormancy ↔ non-dormancy. The secondary dormant seeds of B. napus cannot become non-dormant in darkness, but the level of dormancy may change from maximum (after water stress) to minimum (after warm stratification). It seems that the dormancy imposed by the conditions of deep burial (darkness in combination with water stress and more constant temperatures) might be more important to seed persistence than secondary dormancy induction and release. The dormancy cycle is an important pre-requisite in order to sense the depth of burial and the best time for seed germination.

Response to abscisic acid application and hormone profiles in spring Brassica napus seed in relation to secondary dormancy

2004 ◽  
Vol 82 (11) ◽  
pp. 1618-1624 ◽  
Author(s):  
Robert H Gulden ◽  
Sheila Chiwocha ◽  
Suzanne Abrams ◽  
Ian McGregor ◽  
Allison Kermode ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Brassica Napus ◽  
Osmotic Stress ◽  
Stress Sensitivity ◽  
Brassica Napus L ◽  
Secondary Dormancy ◽  
Aba Sensitivity ◽  
Treated Seed ◽  
High Concentrations ◽  
Osmotic Treatment

The plant hormone abscisic acid (ABA) has been implicated in the inception and maintenance of seed dormancy, while gibberellins promote dormancy breakage and germination in some species. We investigated whether osmotic stress induced secondary dormancy in Brassica napus L. is associated with changes in ABA sensitivity and metabolism, as well as changes in gibberellin levels. Seeds of two genotypes, one with low dormancy potential (LDP) and one with high dormancy potential (HDP) for secondary dormancy, were exposed to a dormancy-inducing osmotic treatment for up to 4 weeks and then germinated in the presence of increasing ABA concentrations. Even at relatively high concentrations of supplied ABA, germination of LDP seed was not inhibited, while relatively low ABA concentrations inhibited the germination of HDP seed after osmotic treatment. Fluridone was highly effective in suppressing secondary dormancy development in HDP seed, but had no effect on germinability in LDP seed. Despite the lack of differences in nonosmotically treated seed, ABA and ABA-glucose ester accumulated to higher levels, and gibberellin A1 accumulated to lower levels, in HDP relative to LDP seed by the end of the osmotic treatment. Our findings indicate an association among ABA sensitivity, biosynthesis and accumulation, and secondary dormancy potential in B. napus seed.Key words: abscisic acid (ABA), Brassica napus, fluridone, induced dormancy, osmotic stress, sensitivity.

scholarly journals Increased BnaMFT-transcript level is associated with secondary dormancy in oilseed rape (Brassica napus L.)

2020 ◽  
Vol 19 (6) ◽  
pp. 1565-1576
Author(s):  
Lei LIU ◽  
Wen-qi FAN ◽  
Fu-xia LIU ◽  
Xin YI ◽  
Tang TANG ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Transcript Level ◽  
Brassica Napus L ◽  
Secondary Dormancy

Dynamics of dormancy during seed development of oilseed rape (Brassica napus L.)

2016 ◽  
Vol 26 (3) ◽  
pp. 245-253 ◽  
Author(s):  
Shoubing Huang ◽  
Sabine Gruber ◽  
Falko Stockmann ◽  
Wilhelm Claupein
Keyword(s):  
Brassica Napus ◽  
Seed Development ◽  
Oilseed Rape ◽  
Early Stage ◽  
West Germany ◽  
Brassica Napus L ◽  
Primary Dormancy ◽  
Secondary Dormancy ◽  
High Level ◽  
Mature Seeds

AbstractSeed dormancy is a critical factor in determining seed persistence in the soil and can create oilseed rape (Brassica napus L.) volunteer problems in subsequent years. A 3-year field trial in south-west Germany investigated the effects of seed maturity on primary dormancy and disposition to secondary dormancy of ten oilseed rape varieties (lines) in 2009 and 2010, and of five imidazolinone-tolerant varieties (hybrids) in 2014. Fresh seeds were sampled weekly from about 30 d after flowering (DAF) until full maturity and tested for dormancy on the day of seed collection. Primary dormancy decreased from a high level of 70−99% at 30−40 DAF to 0−15% after 7−14 d, coinciding with embryo growth and depending on variety and year. For some oilseed rape varieties, 30−50% primary dormancy was still present in mature seeds. Depending on variety, disposition to secondary dormancy was nearly zero at the early stage of seed development, increased to its highest level during development, and decreased afterwards. Some varieties maintained a high level of secondary dormancy at maturity or during the entire seed development period. The correlation between primary dormancy and secondary dormancy was significantly positive at early seed development (r = 0.95, 50 DAF), but declined in mature seeds. Environmental conditions during ripening are also expected to affect dormancy dynamics. The deeper insights into dormancy formation of oilseed rape provide the possibility to improve harvest time and harvest method, and to better assess the potential for volunteer oilseed rape in following crops.

Metabolic and hormonal processes associated with the induction of secondary dormancy in Brassica napus seedsThis paper is one of a selection of papers published in a Special Issue from the National Research Council of Canada – Plant Biotechnology Institute.

Botany ◽  
2009 ◽  
Vol 87 (6) ◽  
pp. 585-596 ◽  
Author(s):  
Houman Fei ◽  
Yurdagul Ferhatoglu ◽  
Edward Tsang ◽  
Daiqing Huang ◽  
Adrian J. Cutler
Keyword(s):  
Gene Expression ◽  
Polyethylene Glycol ◽  
Brassica Napus ◽  
National Research Council ◽  
Plant Biotechnology ◽  
Phenylpropanoid Metabolism ◽  
Brassica Napus L ◽  
Secondary Dormancy ◽  
Primary And Secondary Metabolism ◽  
Aba Insensitive

Polyethylene glycol treatment induces secondary seed dormancy in Brassica napus  L. cultivar ‘AC Excel’ (ACE), but not in ‘DH12075’ (DH). Gene expression, metabolite profiles, and hormone profiles were obtained from seeds of both cultivars following polyethylene glycol 8000 treatment. ACE seeds were more transcriptionally active: 28 genes were up-regulated in both cultivars and 10 and 158 genes were specifically up-regulated in DH and ACE, respectively. Nontargeted metabolite analyses combined with gene expression analyses showed significant differences in lipid, sugar, and phenylpropanoid metabolism between the cultivars. Abscisic acid (ABA) levels were higher and many ABA-inducible genes were expressed more in ACE. An association of ABA with secondary dormancy was supported by the observation that secondary dormancy was induced by polyethylene glycol 8000 in Arabidopsis wild-type seeds, but was reduced in ABA-deficient and ABA-insensitive mutants. Therefore, secondary dormancy appears to be realized through an active ABA-related mechanism that may involve changes in primary and secondary metabolism.

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