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《Acta Microbiologica Sinica》 1984-01
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ISOLATION AND CULTIVATION OF FRANKIA STRAIN ACC13 FROM ROOT NODULES OF ALNUS CREMASTOGYNE

Jiang Jiande;Yang Huifan;Huang Jiabin;Zhu Baoqin;Liu Huichang;Zhong Yuhua;Yang Bifang Institute of Forestry and Pedology, Academia Sinica, Shenyang  
An actinomycetous entophyte, Fran-kia strain ACC13, from root nodules ofAlnus cremastogyne Burk. has been isola-ted as pure culture by sucrose centrifugation.The strain ACC13 is a slow-growing, for-ming dense colonies and pigmentless. Hyphaeare branched septate, and irregular in diame-ter of 0.6-1.4μm. The filaments sho-wed Gram-positive. Typical sporangia weredeveloped from terminal swellings and in-tercalary bulges of hyphae. The diameterof the sporangia varied from 5μm to 25μm, even more than 70μm in individualnutrient media. Spores were formed withinthe sporangia, globose or ovoid, 1.3μm indiameter. Vesicles had been elicited on de-fined nutrient media. The nodule suspen-sions contained on inhibitory substanceswhich may inhibit the growth of the acti-nomycete entophyte during isolation. Thestrain ACC13 grows at pH 6.5-7.2, andnot heat-resistant. Large amount of root nodules havebeen induced by ACC13 on the root systemof Alnus cremastogyne. The root nodules for-med possessed the capability of N_2-fixationwith the activity reaching to 15.7μ molethylene/h.g freshweight. The freshweight of nodulated plants inN_2-free solution one month after inoculationincreased to 9.13 g per bottle and that ofthe non-nodulated plants was only 3.49 g.
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