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Induction of male sterility in oats by foliar application of 2-chloroethylphosphonic acid (ethrel)^*

R.J.B. Pinto^I; F.I.F. de Carvalho^II; M.J.C. de M.S. Tavares^II; L.C. Federizzi^II

^IInstituto de Pesquisas Agronômicas (IPAGRO), Secretaria de Agricultura do Rio Grande do Sul, Rua Gonçalves Dias, 570, 90060 Porto Alegre, RS, Brasil
^IIFaculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Caixa Postal 776, 90001 Porto Alegre, RS, Brasil. Send correspondence to F.I.F.C.

ABSTRACT

The use of gametocides may represent an alternative for the practical exploitation of heterosis in oats. Several traits of oat (A vena sativa L.) plants treated with 2-chloroethylphosphonic acid (Ethrel) were evaluated in field studies. The results varied with genotype, dose and stage of plant development at the time of application. The highest grain yield originating from cross-pollination was obtained when Ethrel was applied at the rate of 1.5 kg/ha immediately before pre-boot. Because of the high phytotoxic effects observed, the use of Ethrel as a gametocide in oats seems to be more appropriate in breeding programs requiring a large number of crosses and not needing large amounts of F₁ seed in each progeny.

Keywords: male; sterility; oats; foliar; 2-chloroethylphosphonic acid; ethrel.

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* Contribution by Setor de Plantas de Lavoura, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul