Studies on pigments related to sugarcane red rot Part I : The reddening (Department of Agricultural Chemistry)

1)甘蔗赤腐病の発現には適当な水分と少量の水分が必要であったが, 酸素の有無にはほとんど無関係であった。2)発病甘蔗から赤色の色素を分泌する絲状菌とそれ自体ピンク色を呈している細菌様菌それぞれ1種を分離した。3)欠糖バカスを蔗糖液で処理して赤変させた人為発現においては, 強力な蔗糖分解酵素を生産する微生物が生育するように思われた。4)赤腐病に関与している色素は, Physalopora菌だけでなく, その他いろいろの要因によって生じた色素の集合体であるように思われた。5)赤腐病進行中, 色素濃度の上昇, pHの低下にかかわらず, 糖分低下の現象はほとんどみられなかった。(1) Sufficient moisture and a small amount of sugar were essential for the occurence of the red rot disease but little oxygen. (2) One strain of fungus which secreted red pigments and one pinkish bacterialike germ were separated from the infected sugarcane respectively. (3) Germs which secreted strongly active invertase seemed to occur in the red pigments which were artificially caused by the addition of sugar solution to the washed bagasses. (4) It seemed that the red pigments involved in the red rot disease were caused by not only fungus physalospo a tucummanensis but also such various other factors as shown in Fig. 3,4 and 5. (5) When the red rot disease advanced, the concentration of the red pigments increaed but pH value decreased, meantime sugar was little consumed