"Genetic model for yielding traits of F1 sugar beet [Beta vulgaris], 1: Half diallel analysis for root weight, sugar content, and harmful non sugar content in self-fertilized O-types."
2002
"Ogata, N. (National Agricultural Research Center for Hokkaido Region, Sapporo (Japan)) | Taguchi, K. | Tanaka, M. "
"In three way top cross hybrids, the seed parent to be used is Fi hybrid, but no clear information of the genetical effects has so far been known. In the present study genetic model of some yielding traits for sugarbeet was analyzed in Fi of half diallel cross using five self-fertilized 0-type as par-ent. For analyzing diallel data, a computer soft, ""Diall"" (UKAI.1989) was used. Firstly, since the epistasis effects were not noticed for the root weight, sugar content and potassium amount from the Vr/Wr graph, it was assumed that these traits were controlled by domi-nance-additive model (Figure 1, 3 and 5). For the root weight, high dominance including heterosis was shown and its narrow sense heritability is 42% (Table 4). From correlation analysis between root weight and root length or root circumference, the circumference-root weight correlation was found higher than the length-root weight correlation (Figure 2). For the sugar con-tent and the potassium amount, the dominance was not high, butthe high additive effects were shown, and narrow sense heritabilities were 92% and 90%, respectively. Secondly, for amino-nitrogen and sodium amount, the dif- ferences among parents were recognized (Table 1). However, since the epistasis and the heterozygosity in parent were supposed to be existing (Figure 4), it wasimpossible to specify their genetic parameters. As a result of above study, individual selection for sugar content based on phenotypes in parent line may be of use to achieve genetical improvement of F SUB1 seed parent sugarbeet. However, since heterosis was prominent on the root weight, line selection based on the combining abilities test in F SUB1 may help fulfil the goal."
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