OAT GENOTYPES (Avena saliva L.) SENSIBILITY IN THE FIRST GENERATION AFTER SEED TREATMENT WITH MUTAGENIC AGENTS
Keywords:
plant breeding, mutagenesis, physiological effects.Abstract
Important contribution for oat genetic improvement is the possibility to use mechanisms that increase geneticvariability. The objective of this work was to evaluate and compare the sensibility of hexaploid oat fixed genotypes as aresponse to the employment of mutagenic agents. Two mutagenic chemicals, ethyl methanesulphonate (EMS) and methylmethanesulphonate (MMS), and one physical (gamma rays), in three doses, were tested in four genotypes. The experimentaldesign was a randomized complete block with three replicates for each treatment, where the experimental unit was composedby a gerbox with germitest paper and 100 seeds. Averages were compared by the Scheffé test. Data indicate linear decrease ofthe characters germination and root length with the increase of the mutagenic dose. Only the linear effect of mutagenic EMSwas significant. Within the studied interval (0-3%), germination decreased (b= -1,03) with the increase of the EMS doses.Gamma radiation caused significant reduction in root length (b = -4,72), as compared to the other mutagenic agents.
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