抄録
1.'MY-20'は,2倍体栽培種の群馬県在来'水ブキ'雌株に,'八ツ頭'雄株を交配して育成された国内初のフキ交雑種である.2.小花のほとんどが雌小花であり,'MY-20'には雌株のみ存在し,雄株はない.3.'MY-20'の花穂収穫量は極めて多く,花穂は,植え付けた種株の芽付近に集中する傾向であり,かたまって発生した.また,花穂の周りを包んでいる苞の数が多く,2月における開苞率が比較的低かった.'MY-20'の苞は,緑がやや濃く,アントシアニン発生が少なく,花穂のしまりはやや良く,品質においても優れた.4.葉柄の長さについては,群馬県在来'水ブキ'に劣り,'MY-20'は,花穂収穫を主とした品種といえる.
New cultivar of Japanese butterbur, 'MY-20' was selected from hybrid plants between 'Mizubuki' (native cultivar of Gunma pref.) and 'Yatsugashira'. A head of 'MY-20' was composed of about a hundred female florets and several sterile florets. Therefore, it was considered a female plant. 'MY-20' produced a remarkable number of spikes and was superior to other cultivars in total spike yield. 'MY-20' showed a tendency for these spikes to concentrate near the bud planted. Marketable yield fell due to the opening bracts, but 'MY-20' snowed a higher marketable yield than other cultivars in February, because the spike of 'MY-20' was wrapped by many bracts which began to open later. 'MY-20' developed less anthocyanin pigments at the bracts, spikes were tighter, which provided excellent quality. The length and diameter of the petiole were shorter than 'Mizubuki' (Gunma). 'MY-20' was mainly concerned with spike harvest.
