琉球松針葉の形態学的研究
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概要
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1. The study was carried out in order to provide fundamental data for the breeding of Luchu island pine by studying the morphological characters' of acerose leaves of five sample trees. 2. The length of acerose leaves ranged from 99.8.. to 198.45 mm, their width from 0.85 to 1.21mm, their thickness from 0.49 to' 0.74 mm, and their volume from 39.21 to 120.93 cubic millimeters. The length of their sheaths ranged from 5.0 to 12.4 mm. The cross section of an acerose leaf shows semi-circle. 3. In epidermal cells, Zelllumen was observed clearly, and the number of layers of hypodermal cells were one to two and in the corner sections two to four layers were present. 4. The number of stomata was about six to eighteen and found on both the ventral and dorsal sides. The front cavity is rather large compared with the respiratory cavity. 5. Form of a resin canal which has been so far considered to be a key of classification is not absolute one. In Luchu island pines, medial, external, internal, and septal were also observed, and their number was from two to six. The mode was from three to five, respectively. The sizes of resin canals ranged from 44.16 to 5495.0 square microns. 6. The number of secreting cells was from 5 to 15, and their sizes were in the range of 34.34 to 431.75 square microns. 7. The number of sclerenchyma cells surrounding and protectecting was from 5 to 15 and their sizes ranged from 68.69 to 735.94 square microns. 8. When the sizes of acerose leave and central cylinders were compared, it was 44.44～59.52％ in width, 47.14％～72.00％ in thickness, and 21.63～36.23％ in area of cross section. 9. The number of endodermis was from 21 to 34, and the area of the cross section ranged from 412.13 to 2472.75 square microns. 10. One or two schizogenous intercellular spaces were observed in the transfusion tissue. 11. Two fibrovascular bundles were present and sizes of a major axis and a minor axis ranged from 110 to 220 microns and from 100 to 160 microns, respectively. The areas of the cross section ranged from 8635 to 24728 square microns.
- 琉球大学農家政学部の論文
- 1956-07-00