STUDIES ON THE GROWING PROCESS OF CELLULOSE FIBER

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Abstract
Concerning the epidermal cells of cotton seed, the auther has chosen, in this paper, several problems in order to make clear the time of the development of fiber cells. The growing process of lint was pursued, the periods of the growth of elongation and wall thickness of lint were daily measured. The cotton variety used for this reserch was “Rikuchimen Kanno No.1”. a sort of upland cotton. The results obtained may be sumarized as follows:1. Observations on the fiber cell formation in seed wall showed that the protuberances of epidermal cells occured twice after flowering. The first one ensued for only two days from the date of flowering. The second one, on the contrary, continued for comparatively long interval, that is, from 4th to 12th day, after flowering. Hair cell differentiation of the lint type chiefly occured in first protuberance, and that of the fuzz hair type in second protuberance. Therefore, fuzz hair differentiation follows lint hair differentiation.2. The elongation growth of lint begins immidiately after flowering, the length of lint increases linearly, and completes 24th day after flowering. The growth of wall thickness begins from the 20th day after fllowering, and wall thickness increases also linearly. The deposit percentage of cellulose on the cell wall parallels with the growth process of wall thickness. (Cotton boll opens at 59th day after flowering.)3. The moisture contents of lint and cotton seed in fresh weight basis, the fresh diameter of lint in the cotton boll, the dry diameter of lint, were measured and those results are discussed.

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