Studies on the changes of sugar components and starch in mulberry plant after cutting

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  • HATTA Haruko
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • HOMMA Shin
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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Other Title
  • クワのさし木後における各器官中の糖およびデンプン含有率の経時的変化
  • クワ ノ サシキ ゴ ニ オケル カク キカン チュウ ノ トウ オヨビ デンプン ガンユウリツ ノ ケイジテキ ヘンカ

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In the previous paper, we presented experimental evidence indicating the growth in dry weight and changes in the activity of amylase and invertase with hard-wood cutting of mulberry plant.<br>In the present paper, the growth of early stage was studied with the same hard-wood cutting as that used in the previous paper, by measuring the content of sugar components and starch in barks and woods of the hard-wood cutting, young shoots and leaves.<br>The results were as follows:<br>1. The content of starch in bark and wood of the hard-wood cutting decreased up to about 40 days, from then increased. It was seen that the change in the content of starch closely paralleled to that of dry weight of bark and wood of the hard-wood cutting.<br>2. Starch in bark and wood of the hard-wood cutting was consumed, respectively, 70% and 75% of the total amount of consumption up to about 20 days after cutting, during the time when the high activity of amylase in the barks continued.<br>3. The contents of glucose and fructose in bark and wood showed a gradual increase to about 40 days after cutting, accompanied by breakdown of starch.<br>4. During 75 days after cutting, the content of sucrose in bark always showed the very high values compairing that in wood. There was a decline in the contents of sucrose in bark and woody in the initial 5 days of the development, followed by the low content in the wood till about 40 days, but in the bark by the fluctuated high content. After about 40 days, the content of sucrose in bark and wood increased.<br>5. A rapid increase in the contents of glucose, fructose and starch in new shoots and leaves starts from cutting, reaching maximum at about 20 days, while the content of sucrose decreased in the initial 5 days and then increased till about 20 days after cutting.<br>The same tendency may be shown among the changes of contents of sugar components and starch, those of the activity of amylase and invertase, and those of the rate of respiration in sprouted young plants.

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