Inheritance and linkage relationships of genes conditioning hullessness, multiflorous spikelet, and giantism in oat (Avena sativa L.)

Abstract

Kibite, S. and Taylor, J. S. 1994. Inheritance and linkage relationships of genes conditioning hullessness, multiflorous spikelet' and giantism inoat(Avena sativaL.\. Can. J. Plant Sci. 74:497-500. A study was conducted to determine the number of g.n.r, typ" of gene action, and linkage relationships of the factors controlling the expression of hullessness, multiflorous spikelet and giantism in oat (Avena sativaL. var. PI 546363). The results showed that giantism was governed by a recessive gene' which in a homozygous (gi-ilgi--l) condition may have an epistatic effect on several other loci including those controlling the expression of plant treiglt; tength, width, and thickness of leaves; culm diameter; number of internodes; panicle size; pedicle length; and number of days to anthesis and to maturity. The results also indicated monogenic inheritance for hull and spikelet characteristics.Hullessness (N-I I _) was dominant over hullednes s (n-I I n-t) , and multiflorous spikelet (Mf-I I -) was panially dominant over normal spikelet(mf-Ilmf-t). Linkage was detected between the gi-3 locus controlling giantism, and the n-1 locus controlling hullessness; the recombination value was calculated to be 36.5 + O.8Vo. Linkage was also detected between the gi-3 gene and the Mf-I locus conditioning multiflorous spikelet; the recombination value was 23.5 + 0.4%. The N-1 gene appears to have an epistatic effect on the uj-l locus, and the recombination frequency between the two loci was 10.5 ! 0.6%. The gene order was gi-3, Mf-L, N-l.

Genetic and molecular characterization of multiflorous spikelet in oat

“…The inheritance of the multiflorous spikelet trait has been investigated in several studies over the past century, and the results have indicated that the action of a major gene controls the trait and has a strong effect on the phenotype (Caporn, 1918;Love and McRostie, 1919;Boland and Lawes, 1973;Kibite and Taylor, 1994;Cabral et al, 2000). However, oat breeders and researchers believed that this major gene also participated in the formation of naked grains (Simons et al, 1978;Ougham et al, 1996).…”

“…However, oat breeders and researchers believed that this major gene also participated in the formation of naked grains (Simons et al, 1978;Ougham et al, 1996). A genetic model proposed by Kibite and Taylor (1994) suggested that the action of two distinct genes were involved: Multiflorous1 (Mf1), which controls the formation of multiflorous spikelets, and Naked1 (N1), which controls the formation of naked grains. The strength of the two separated gene model was verified by analysis of phenotypic data involving the joint segregation of N1 and Mf1, in which an extremely low recombination frequency was observed (Kibite and Taylor, 1994).…”

“…A genetic model proposed by Kibite and Taylor (1994) suggested that the action of two distinct genes were involved: Multiflorous1 (Mf1), which controls the formation of multiflorous spikelets, and Naked1 (N1), which controls the formation of naked grains. The strength of the two separated gene model was verified by analysis of phenotypic data involving the joint segregation of N1 and Mf1, in which an extremely low recombination frequency was observed (Kibite and Taylor, 1994). These results justify the strong association between the multiflorous spikelet and naked grain phenotypes.…”

Genetics and identification of markers linked to multiflorous spikelet in hexaploid oat

“…However, the mechanisms of genetic inheritance of these traits are not fully elucidated. Genetic studies conducted by Kibite and Taylor (1994) suggest that both "naked grain" and "multiflorous spikelet" characters have monogenic inheritance. Based on this model, the naked grain character is controlled by the Naked1 (N1) gene.…”

Análise genética do caráter nuda em panículas de aveia hexaplóide

“…Most genetic studies suggest that this characteristic in oat is controlled by a single gene (Norton 1907, Zinn and Surfaice 1917, Clamot 1969, Kibite and Taylor 1994; however, other studies report the existence of up to four genes controlling this trait (Moule 1972, Jenkins andHanson 1976). Knowledge regarding the number of genes of the trait under study and the distribution of the naked grains in the panicles in Brazilian germplasm will allow development of more efficient selection strategies to bring about oat cultivars with this characteristic.…”