Genetics of naked grain oats in crosses with Brazilian genotypes

Cândida Braga Cabral,Emerson Limberger,Cristhiane Abegg Bothona,Ivone Taderka,Sandra Cristina Kothe Milach,Luiz Carlos Federizzi,Luis Marcelo Tisian

doi:10.1590/s1415-47572000000400025

Genetics of naked grain oats in crosses with Brazilian genotypes

Cândida Braga Cabral, Emerson Limberger + Show 5 more

Open Access

https://doi.org/10.1590/s1415-47572000000400025

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Abstract

Six crosses between three naked oat (Avena sativa L.) germplasm sources from the USA and Australia and three Brazilian hulled genotypes were studied for the segregation of naked grain and multiflorous spikelet traits in the F2 and F3 generations. One major gene with incomplete dominance and expressivity for both traits was identified in all populations. The occurrence of intermediate types for naked grain varied with the population and did not depend on the germplasm source of naked grain used. The frequency of intermediate types varied among F2 populations indicating that selection for higher expressivity of naked grain could be used to develop Brazilian oat lines with naked grain.

Highlights

In southern Brazil, oat (Avena sativa L.) acreage has increased from about 10,000 ha to more than 400,000 ha in the past 10 years
We report the first study of naked grain segregation in crosses with Brazilian oat genotypes
A continuous distribution of F2 plants with a concentration of individuals in the extreme classes was observed in all crosses in terms of both the percentages of naked grain and multiflorous spikelets (Figure 1)

Summary

Introduction

In southern Brazil, oat (Avena sativa L.) acreage has increased from about 10,000 ha to more than 400,000 ha in the past 10 years. The low bulk density of the grain makes it more expensive to transport and store than other cereals. Naked oats eliminate these problems and have been used throughout the world for non-ruminant feeding (Valentine, 1995). One major dominant gene in oat, N-1, has been reported to be responsible for the naked grain trait (Simmons et al, 1978). In some crosses up to three (Moule, 1972) or four epistatic genes in oats (Jenkins and Hanson, 1976) were found to be involved in control of the trait. The expressivity of this trait has usually been reported to be incomplete and greatly influenced by the environment (Jenkins and Hanson, 1976)

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