Abstract
Heterozygosity and the mode of inheritance of various characters within selfs (S1) of the Japanese taro, 'Mizu-imo' and a wild Thailand taro, 'Tha-1', and their F1 and F2 progenies, respectively, were investigated. 'Mizu-imo' has petioles with anthocyanin pigments and a low density of idioblasts with raphids, whereas 'Tha-1' has green petioles with numerous idioblasts that contain the needle-like calcium oxalate crystals. The idioblast densities in petioles of Si of 'Mizu-imo' and 'Tha-1' were lower than those of the parents; the heritabilities of idioblast density were, respectively, 0.487 and 0.511. The idioblast densities in petioles of F1 and F2 progenies segregated widely; their mean values, however, were intermediate between the parents, indicating that the heritability of idioblast is controled by polygenes. From segregation ratios of F1 and F2 generations, anthocyanin pigmentation in petioles of taro was presumed to be controlled by a single dominant gene. Therefore, the genotypes of 'Mizu-imo' and 'Tha-1' are postulated to be heterozygote and recessive homozygote, respectively, but the anthocyanin content is supposedly a quantitative character controlled by polygenes. Anthocyanin pigmentation in rachis of taro was presumed to be controlled by a single dominant gene. Therefore, the genotypes of 'Mizu-imo' and 'Tha-1' are postulated to be heterozygote and recessive homozygote, respectively. Development of the stolon was presumed to be controled by a single dominant gene. Therefore, the genotypes of 'Mizu-imo' and 'Tha-1' are postulated to be recessive homozygote and dominant homozygote, respectively.
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