Efficient selection of a high-yield line by using somaclonal variation in Japanese butterbur (Petasites japonicus)

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  • Iwamoto Yuzuri
    Research Institute of Environment, Agriculture and Fisheries, Osaka Prefectural Government
  • Nakasone Wataru
    Research Institute of Environment, Agriculture and Fisheries, Osaka Prefectural Government
  • Ezura Hiroshi
    Gene Research Center, Graduate School of Life and Environmental Sciences, University of Tsukuba

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  • Efficient selection of a high-yield line by using somaclonal variation in Japanese butterbur (<i>Petasites japonicus</i>)

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To induce somaclonal variations related to plant yield, adventitious buds were directly regenerated from immature flowerheads of a selected line A of the ‘Aichi Wase Fuki’ of Japanese butterbur (Petasites japonicus). Among the 280 independent regenerants obtained from 300 immature flowerheads, about 2/3 were regenerated within 90 d of culture. The total yield of the randomly selected 50 lines among the early regenerants ranged from 13.8 to 21.6 kg m−2 (average: 18.2 kg m−2) in the field, and a high correlation (r=−0.869) was observed between the total yield and the period required for the third leaf initiation in flowerhead culture. A high correlation (r=0.923) was also observed between the yield in the field and the fresh weight of rhizomes at 3 months of culture in the greenhouse. Since the yield of the original line A was 16.4 kg m−2, direct adventitious bud regeneration is a useful technique for inducing high yielding variants in Japanese butterbur, which might be efficiently selected by monitoring the period required for third leaf initiation and the weight of rhizomes.

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