馬鈴薯の塊茎形成に関する研究 : (第6報)塊茎形成肥大機構に関する細胞学的一考察
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概要
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In this paper the writer reported and discussed result of cytological observations caried out in 1950 year upon the process of tuberization in the potato plant. The results summarized are as follows: 1) the portions that the cell division in the elongating tuber occurred in the greatest number was the most terminal one, but as soon as the stolons began to swell, the cell division came to be seen not only in terminal, but also pretty numerously in middle and basal portions, and also in the direction of it the rate of redial one to the logitudinal increased. The fact described above shows us a change from the terminal elongation to the lateral development in the tip of stolon from a point of cytological observations. 2) the regions that the dividing cell per one microscopical field was seen in the greatest number were internal phloem parencyma and vascular tissue, and it was supposed that cells formed successively from the cambium in the vascular tissue were organized externally into phloem parencyma and internally into medulla. 3) comparing the direction of cell division in each tissue, the cell division in longitudinal and tangential ones was seen to occur more numerously than in radial at cortex. The fact described above shows us that the external tissue must enlarge to increase the circumference in proportion to the enlargement of internal tissue. 4) the cell division in the enlarging tuber weighed more then about 2g was rarey seen, comparing with it in the elongating stolon or the young tuber, and then it was scarcely found in the tubers weighing upwards of about 30 g. 5) the increasing curves of cell size and number in proportion to the increase of tissue size were expressed by an exponential formula, and the increasing rate of cell number in it was greater than that of cell size. 6) changes of the relative growth tare of above two curves were expressed by a formula Rx=b(R: relative growth rate, x: tissue size, b: constant), and this result shows us clearly that the activity of development is vigorous in young tubers, but weak in large tubers, and also this fact corresponded to it of observations upon the cell division.
- 日本作物学会の論文
- 1952-12-20