桑樹の耐雪性に関する研究 : 第1報皮部一般成分の品種間差異について

概要

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Some varietal differences of the chemical constituent in the bark of tree in relation tothe resistance to the mulberry-bli.ght were investigated.The results obtained are summarized as follows : ( 1 ) Quantity of the total carbohydrates in the bark was not so changed regardless of variety, Iocality and season (at both the times after falling of leaves and thawing). ,( 2 ) Tendencies in (iecrease of total sugar content were found in all materials, especially, in weak varieties, the remarkable decrease in the total sugar occurred accompanied by an increase in insoluble carbohydrates during winter. ( 3 ) It was obviously noticed that the insoluble carbohydrate content/total sugar content ratio in the bark at the time after falling of leaves was higher in strong varieties than in weaker ones. In other words, the barks of strong varieties are more advanced in degrees of hardening than those of weaker at this time. Similar analytical result was found between nitrogen fractions. ( 4 ) No correlation was found between water content and the blight resistance. ( 5 ) From the results mentioned above, it was suggested that the degree of debility of mulberry-tree under snow layer was deeply related to the physiological characteTistics of varieties before snow cover.
日本育種学会の論文
1958-03-15