Comparison of Growth Characteristics among Several Species of Canna spp.

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Several strains of <I>Canna</I> spp. distributed in tropical or sub-tropical areas in the world were grown under a plastic house to compare the growth characteristics in Kanagawa, Japan. There were significant negative correlations at 5% level between the dry weight of the rhizomes and duration of flowering or number of shoots, while there was no correlation between the other characteristics examined. Each growth characteristic was mutually controlled by different genetic factors, suggesting the possibility to develop a new clonal line carrying several different characters suitable for a high yielding ability. Shape of the rhizomes in <I>Canna</I> species was divided into two groups: an elliptical form prostrated to spreading underground and a globular form clustering around the main tuber. There were two types in the mode of shoot appearance: shoot appearance occurred continuously and discontinuously during the growing season. In the former type, flowering occurred continuously and growth of the rhizomes started just after the development of terminal leaves. The observations suggest that the breaking of apical dominance induced by the differentiation of flower buds of the shoot may reflect the continuous shoot appearance.
日本熱帯農業学会の論文