Abstract
Lipo-chitooligosaccharides (LCOs) are signal molecules that play a role in initiating the symbiotic legume-rhizobia and arbuscular mycorrhizal processes. Thuricin 17 is a bacteriocin produced by Bacillus thuringiensis strain NEB 17. Previous work has shown that the application of a 10−6 M LCO solution, or a 10−11 M thuricin 17 solution, can stimulate the germination and growth of a wide range of plants. The objectives were: to grow canola cultivar 04C111 under optimal temperature conditions in a greenhouse, and to assess the effect of LCO seed application and spray treatment on 04C111 floral initiation, architecture, and factors that contribute to yield; to assess the effect of a thuricin 17 seed application treatment upon factors that contribute to 04C111 yield in a stressfully high temperature greenhouse system; and to assess the effect of an LCO seed application and spray treatment on Topas floral initiation, architecture, and factors that contribute to yield, and seed quality, in a simulated “cool spring” greenhouse system. According to the 95 % confidence limits, Brassica napus cultivars grown from untreated seed produced 39 % fewer to 1 % fewer branches than plants grown from LCO-treated seed. Application of an LCO foliar spray increased the total of branch lengths per 04C111 plant by 16.93 ± 8.41 cm. Based on the stem-to-branch length ratio, LCO-sprayed 04C111 plants were 68 % less apically dominant than unsprayed plants. Topas plants that were sprayed with LCO produced seed with approximately 4.45 ± 0.23 % more oil (% d.w.) than unsprayed plants. For both cultivars, seed treatment with 10−6 M of LCO produced plants with a higher average sum of primary, secondary, and tertiary branch (≥1 cm) frequencies.
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Abbreviations
- BIC:
-
Bayesian Information Criteria
- cv:
-
Cultivar
- RLK:
-
Chitin elicitor receptor kinase
- DAP:
-
Days after plannting
- GA:
-
Gibberellin
- LCO:
-
Lipo-chitooligosaccharide (Nod Bj V [C181, MeFuc])
- LysM:
-
Lysin motif
- GlcNAc:
-
N-acetylglucosamine
- PGR:
-
Plant growth regulator
- PC:
-
Principal component
- PCA:
-
Principal component analysis
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This work was completed thanks to funding acquired by Donald Smith from the Green Crop Network and the Eastern Canadian Oilseed Alliance.
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Schwinghamer, T., Souleimanov, A., Dutilleul, P. et al. The response of canola cultivars to lipo-chitooligosaccharide (Nod Bj V [C18:1, MeFuc]) and thuricin 17. Plant Growth Regul 78, 421–434 (2016). https://doi.org/10.1007/s10725-015-0104-4
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DOI: https://doi.org/10.1007/s10725-015-0104-4