• 作者： 黃?溪
• 作者服務機構： 中央研究院植物研究所
• 中文摘要： 水田中之藍綠藻分解細菌經純化、定性後，分為黏液細菌G型和N型兩類，前者核酸之 G:C 比率低（約47%），後者之 G:C 比率高（約68%）。這類細菌可以直接附著於藍綠藻之細胞表面，引起藻細胞之解體。在靜止期或下降期之細菌培養液中，含有分解藍綠藻之體外酵素。此類黏液細菌對酸鹼度與溫度有良好之適應性，它們在水田中的分佈相當普遍。以念珠藻HA101做實驗，發現藻類的族群因這類細菌的出現而下降，但如長期觀察，則可發現藻類與細菌後來可建立一種共存的關係。對水田接種藍綠藻的結果，顯示這類細菌對水田中之藍綠藻的族群密度扮演著重要角色。
• 英文摘要： Two types of BGA-lysing myxobacters were isolated from rice fields. The myxobacter G type has alow G:C ratio (about 47%), and the myxobacter N type has a high G:C ratio (about 68%). These bacteriaattached on the surface of algae and caused the lysis of the vegetative cell. Extracellular BGA-lytic enzymesappeared in the supernatant when the bacterial culture reached the stationary phase or the decreasing phase.They tolerate wide range of pH and temperature, and are abundant in the rice farming area. In the presenceof the BGA-lysing bacteria, population of Anabaena HA101 was controlled within a few days. However, asthe incubation period was lengthened, the population of BGA was re-established and then maintained incoexistence with the bacteria. Inoculation of BGA with the water taken from rice field demonstrated thatthe BGA-lysing myxobacter played a role in the control of BGA population.
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