鱗莖類の構造及び生育週期に関する調査-1-

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1. The normal differentiation and growth of scales, lateral bulblets and flower buds and transferring of new growth point on the bulbs of trumpet narcissus "King Alfred" were investigated. 2. Six to seven scales are formed in one life-cycle, composing a scale group of one generation. Outer two or three of them are not foliage leaves but sheaths (Table 2). 3. The scales usually surround growth point in globular form, but the one just outside of a flower bud is not globular but ligulate (Fig. 1, Fig, 2, and Fig. 5). A mature bulb consists of seventeen to eighteen scales (Table 1). 4. The scale group appears on the ground and forms a leaf group in the year next when its formation has been completed. The scales remain as storage organ and compose the outer part of bulb after upper leaves or sheaths have died away. The average life length of a scale is about two and a half years. 5. From middle April to May about 3 lateral bulblets are formed as axillary buds of the scales which are then actively working as leaf group (Table 3, Fig. 7). They are more frequenty differentiated in the axils of foliage scales than sheaths (Table 5). 6. The scale group of the first generation of new lateral bulblet consists of two foliage scales and 2 sheaths (Table 6). The formation of scale group of the second generation begins soon after the end of the first generation without interruption. 7. Difference in the growth of lateral bulblets is hardly found irrespective of their location. The outer ones sometimes come out of mother bulb after one and a half years of their initial differentiation (Fig. 5). 8. Flower bud is initiated both in a mature bulb and a vigorous two-years old bulblet(Fig. 12_??_Fig. 15). 9. New growth point is differentiated close at the base of the flower bud, opposite to the ligulate scale after 15_??_20 days of flower bud initiation (Fig. 11).
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鱗莖類の構造及び生育週期に関する調査-1-

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