Breeding "MY-20", hybrid cultivar of Japanese butterbur (Petasite japonicus Fr.Schmidt)
2006
Koizumi, T.(Gunma-ken. Research Center for Mountainous Area Horticulture, Numata (Japan)) | Ikeda, H.
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' showed 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.
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