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Tsuda S.,National Agr Research Center For Hokkaido Reg | Mori M.,National Agr Research Center For Hokkaido Reg | Kobayashi A.,National Agr Research Center For Hokkaido Reg | Takada A.,National Agr Research Center For Hokkaido Reg
Japanese Journal of Crop Science | Year: 2011

Potato microtubers (MT), generally 1 gram fresh weight, are mass-produced under in-vitro conditions, and they are used as seed tubers in the fields. We previously found the varietal differences in tuber yield characters of plants grown from MT, and the varieties were divided into two groups; one with a larger number of tubers with lighter individual tuber weight than in plants from conventional seed tubers (CT) (tuber-number type), and the other with opposite characters (tuber-weight type). The purpose of this study is to make clear the mechanism of regulating the yield characters of MT plants. We conducted experiments using four varieties, including different types of the yield characters in MT plants, for five years. In all five years, the MT/CT ratio in tuber number was negatively correlated with that in individual tuber weight. The number of tubers increased from an early tuber growth stage to a harvest time was larger in MT plants of tuber-number type varieties than in that of tuberweight type varieties. There was a significant negative correlation between the increased number of tubers and the tuber yield at an early tuber growth stage. These results suggest that tuber growth may affect earliness or lateness of the end of tuber formation. The findings of the characteristics of varieties found in this study may be useful to improve the multiplication rates of the seed potato production using MT plants. Source


Tsuda S.,National Agr Research Center For Hokkaido Reg | Mori M.,National Agr Research Center For Hokkaido Reg | Kobayashi A.,National Agr Research Center For Hokkaido Reg | Takada A.,National Agr Research Center For Hokkaido Reg | And 3 more authors.
Japanese Journal of Crop Science | Year: 2011

Potato microtubers (MT) (about 1 gram fresh weight) are mass-produced under in vitro conditions, and are used as seed tubers in field. We previously found that potato varieties were divided into two types, larger tuber number with lighter individual tuber weight (type 1), and smaller tuber number with heavier individual tuber weight (type 2) in the plants from MT. The purpose of this study is to ascertain whether the effects of seed tuber size and planting density on the tuber number and individual tuber weight of MT plants vary with the type of varieties. In type 1 variety Norin 1, the plants from MT had larger number of tubers than those from conventional seed tubers (CT). On the other hand, in type 2 variety Nishiyutaka, the plants from MT had heavier individual tuber weight than those from CT. High planting density caused a larger tuber number per unit area and lighter individual tuber weight in both types of varieties, i.e., type 1 variety Irish Cobbler and type 2 variety Toyoshiro. We concluded that planting small size MT at a high density will be useful for the seed tuber production system in fields regardless of variety type. Source

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