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Production of mutants with high cold tolerance in spring canola (Brassica napus)

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Abstract

A major factor affecting spring canola (Brassica napus) production in Canada is killing frosts during seedling development in the spring and seed maturation in the fall. The objective of this study was to explore the possibility of producing spring canola lines with mutations that have altered biochemical pathways that increase cold tolerance. The approach was to generate UV point mutations in cultured microspores followed by chemical in vitro selection of individual mutant microspores or embryos resulting in measurable alterations to various biochemical pathways with elevated levels of key defense signaling molecules such as, salicylic acid (SA), p-Fluoro-d,l-Phenyl Alanine (FPA), and jasmonic acid (JA). In addition, since proline (Pro) is known to protect plant tissues in the cold-induced osmotic stress pathway, mutants that overproduce Pro were selected in vitro by using three Pro analogues: hydroxyproline (HP), azetidine-2-carboxylate (A2C); and, 3,4-dehydro-d,l-proline (DP). Of the 329 in vitro selected mutant embryos produced, 74 were identified with significant cold tolerance compared to their donor parents through indoor freezer tests at −6°C, and 19 had better winter field survival than winter canola checks. All chemically selected mutant doubled haploids with increased cold tolerance compared well with parent lines for all seed quality and agronomic parameters. Development of increased frost tolerant cultivars should allow for spring canola to be produced in western Canada without compromising seed quality.

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Abbreviations

A2C:

Azetidine-2-carboxylate

B5G:

Solid germination medium

DH:

Doubled haploid

DP:

3,4-dehydro-d,l-proline

FPA:

p-Fluoro-d,l-Phenyl Alanine

HP:

Hydroxyproline

JA:

Jasmonic acid

LD50 :

Lethal dose at 50% kill

NLN:

Liquid embryo initiation medium

Pro:

Proline

ROS:

Reactive oxygen species

SA:

Salicylic acid

SAR:

System acquired resistance

SD:

Spontaneous diploid

UV:

Ultra violet

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Acknowledgements

The authors thank Monsanto Inc. Canada for financially supporting this study and Dr. I. d’Silva and Dr. R. Fletcher for their help with the biochemistry aspects.

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  1. Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada, N1G 2W1

    Scott L. McClinchey & Laima S. Kott

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  1. Scott L. McClinchey
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Correspondence to Laima S. Kott.

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McClinchey, S.L., Kott, L.S. Production of mutants with high cold tolerance in spring canola (Brassica napus). Euphytica 162, 51–67 (2008). https://doi.org/10.1007/s10681-007-9554-8

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