| 水稻和李氏禾属植物上四种Xanthomonas属病原细菌氮素营养的研究 |
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| 引用本文： | 方中达,许志纲.水稻和李氏禾属植物上四种Xanthomonas属病原细菌氮素营养的研究[J].植物病理学报,1965,8(1):31-39. |
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| 作者姓名： | 方中达 许志纲 |
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| 作者单位： | 南京农学院植物保护学系 |
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| 摘 要： | 试验结果证明:X.oryzae不能利用硝态氮,对氨态氮的利用能力也很差。X.protypus的菌株O-722对硝态氮和氨态氮的利用能力都很强。X.oryzicola、X.leersiae和X.protypus的菌株LS-9则介乎两者之间。若以蔗糖代替葡萄糖作碳源,则X.oryzae对铵盐的利用能力显著增强。X.oryzae对氨基酸等的要求较X.oryzicola严格。对X.oryzae生长最适宜的氨基酸是L-谷氨酸、L-门冬氨酸、L-脯氨酸和L-丙氨酸等,以L-谷氨酸最好。X.oryzicola适宜的氨基酸与上述相似,但是种类更多一些。因此,白叶枯病的发展与水稻营养状态之所以有密切的关系,这与白叶枯病细菌的营养特征有关。水稻细菌性条斑病细菌对氮肥的反应不象白叶枯病菌那样敏感,可能是条斑病细菌对氮素营养的要求不如白叶枯病细菌严格的原故。试验结果还指出,致病性强弱不同的细菌对氮素营养的要求不同,接近于腐生的弱寄生性菌(X.protypus),对硝态氮和氨态氮的利用能力都很强。因此,在一系列有亲缘关系的细菌中,随着致病性的增强,对氮素营养的要求也可能相应地更加严格。
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A COMPARATIVE STUDY ON THE NITROGEN NUTRITION OF FOUR SPECIES OF PHYTOPATHOGENIC BACTERIA OF THE GENUS XANTHOMONAS FROM RICE AND LEERSIA |
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| Fang Chong-tah,Shu Tsi-kang.A COMPARATIVE STUDY ON THE NITROGEN NUTRITION OF FOUR SPECIES OF PHYTOPATHOGENIC BACTERIA OF THE GENUS XANTHOMONAS FROM RICE AND LEERSIA[J].Acta Phytopathologica Sinica,1965,8(1):31-39. |
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| Authors: | Fang Chong-tah Shu Tsi-kang |
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| Institution: | Dept. Plant Protection, Nanking Agricultural College |
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| Abstract: | Species under study were X.oryzae (isolate OS-8 from rice),X.oryzicola (isolate OS-602 from rice),X.leersiae (isolate LJ-12 from Leersia) and X.protypus (isolate LS-9 and 0-722 respectiveIy from Leersia and rice).The basal medium was prepared according to Starr's formula,and the amount of different sources of nitrogen used was adjusted so that the amount of nitrogen was equivalent to two grams of asparagine or 424 mg nitrogen per liter of the culture solution.Results showed that these four species were different in their nitrogen re-quirements.X.oryzae could not utilize effectiveIy nitrates or ammonium salts,but its ability to utilize ammonium salts could be enhanced if sucrose instead of glucose was supplied as the carbon source.On the other hand,isolate 0-722 of X.protypus could utilize effectively both nitrates and ammonium salts.X.oryzicola,X.leersiae and isolate LS-9 of X.protypus were intermediate between them.X.orgzae was also quite specific in its requirements of organic form of nitrogen such as amino acids and amides.The most favorable amino acids for X.oryzae were found to be L-glutamic acid,L-aspartic acid,L-alanine and L-proline.These amino acids were also favorable for X.oryzicola,but more amino acids and amides could beutilized by X.oryzicola.Results of previous experiments indicate a close relationship between the development of the bacterial leaf blight of rice caused by X.oryzae and the nutritional condition of the rice plant,and it may be partly explained by the specific nutritional require-ments of the causal organism. |
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