カンキツ果実の発育に関する組織学的研究-1-
スポンサーリンク
概要
- 論文の詳細を見る
Morphological and histological observations were made on the fruit development of Satsuma orange. The flowers bloomed in mid-May, and the fruits matured in mid-November. 1. Rapid increase in the peel thickness began in early June. It was due principally to the active division of albedo cells at this stage. Cell division in mid-albedo almost ceased on about June 10, the fruit diameter at that time being about 9mm, and then the derivatives enlarged. The epidermis and hypodermis of the peel seemed to continue their cell division until considerably late stage in the fruit growth. 2. Juice sac primordia appeared in mid-May. The membranous epidermis of mature juice sacs consisted of fiber-like cells which were oriented parallel to the longitudinal axes. The epidermal cells at the base of juice sacs began to elongate in early June while the cells near the apex of the sacs continued to divide until much later stages. The latter cells began to elongate later. Elongating cells splitted simultaneously along their longitudinal axes. This splitting continued until late June to early July. Then these derivatives gradually thickened. 3. The inner epidermis of the lateral walls of pulp segments in the mature fruit consisted of fiber-like cells which were oriented to the radial direction of the fruit. The majority of epidermal cells began to elongate already at the time of flowering and simultaneously splitted along their longitudinal axes. The splitting continued until July. The radial growth of the segment walls was due mainly to the elongation of cells. On the other hand, they owed their longitudinal growth principally to the active cell division. 4. After mid-October the tissue of pulp segments mostly failed to grow while the peel still contiuned its growth. Consequently the spongy tissue of central axis was split and pulled apart as the peel growth progressed. 5. Relation between the fruit weight and the number of juice sacs was studied. Larger fruits tended to have more juice sacs. The fruits from a tree of low vigor contained notably few sacs. Nu-tritive condition and/or food materials within the tree seemed to exert a remarkable influence on the formation of juice sacs.
- 園芸学会の論文