EMS induction of early flowering mutants in spring rape (Brassica napus)

Thurling, N. and Depittayanan, V. (1992) EMS induction of early flowering mutants in spring rape (Brassica napus). Plant Breeding, 108 (3). pp. 177-184.

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Treatment of seeds of the highly inbred B. napus line TB8 with ethyl methanesulfonate (EMS) for 12 h had adverse effects on M1 plant development and fertility only when concentrations were greater than 1%. However, an EMS concentration of 1.5% did not reduce M1 plant fertility to an extent which significantly reduced production of M2 seeds. Genetic changes induced by EMS treatment and affecting flowering time were of 3 main types: (1) Changes within a polygenic system reflected by increased variation in flowering time among M2 families. As the increase in variation was due primarily to a higher frequency of later flowering plants, these polygenic changes would be of little value in developing better-adapted cultivars. (2) Induction of a recessive mutation at a major gene locus which caused M3 plants homozygous for the mutant gene to flower at least 20 days earlier than the parental line TB8. (3) Induction of a dominant mutation at a major gene locus which affects flowering time by causing a substantial reduction in vernalization requirement. M2 plants carrying the mutant gene flowered as early as 59 days before the parental line

Item Type: Article
Author Affiliation: School of Agriculture, University of Western Australia, Nedlands, WA 6009, Australia
Subjects: Crop Improvement
Divisions: General
Depositing User: Mr B Krishnamurthy
Date Deposited: 02 Apr 2013 05:01
Last Modified: 02 Apr 2013 05:01
Official URL: http://dx.doi.org/10.1111/j.1439-0523.1992.tb00118...
URI: http://eprints.icrisat.ac.in/id/eprint/9963

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