りんご樹の凍害に関する研究(第2報) : 更に耐凍性に関する2, 3の生理について

概要

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1. The moisture content and respiration of twigs of some varieties of apple tree were studied. 2. One year-twigs of two varieties, Ralls Janet and Dolgo, were used as material. The former was known as less hardy and the latter as very hardy. 3. The decrease of moisture content from the beginning of autumn was correlated with the hardiness of plant. 4. In autumn the water content of Ralls Janet was about 10 per cent larger than that of Dolgo. The difference, however, became small and their water content became rather constant in the beg-inning of winter. 5. Cambium and upper cortical layer were more resistant to the cold injury than the other tissues. A good correlation between the hardiness and the moisture content of the varieties was found from September to the end of November and since then was not the case. 6. Output of CO2 of dormant twigs in hardy varieties was less than in unhardy ones. 7. As a rule, the CO2 elimination of twigs per hour decreased as the time passes. The difference in values of CO2 productoin in varieties was not found at least after seven hours.
園芸学会の論文