盐胁迫下粪产碱菌在水稻根表的定殖(英文)

Colonization of Alcaligenes faecalis on the rice roots under the salt stress

粪产碱菌A1 5 0 1能在氯化钠浓度高达 4%的固体和液体介质中良好生长 ,合成IAA和固定空气中的氮素。当氯化钠浓度超过 3 %时 ,A1 5 0 1丧失运动和趋化能力。一定盐浓度胁迫下A1 5 0 1能定殖在水稻根表和根毛区和侧根伸出部位 ,表现出较高的联合固氮活性。0 5 %的氯化钠能促进A1 5 0 1在水稻根表的定殖能力。A1 5 0 1能通过侧根伸出部位侵入根内。

Alcaligenes faecalis A 1501 could grow well in solid of liquid medium containing 4%NaCl. A 1501 could produce IAA under the salt stress and maintain efficient N\|fixing activity when NaCl concentration is lower than 4%. Bacteria lost chemotactic capability when concentration of ammonia is higher than 3\^0%. A1501 colonized on root surface and root hairs, especially on zones of emergence of lateral roots and efficiently fix nitrogen there under the salt stress. 0\^5% of NaCl enhanced colonization of A 1501 on root surface. A1501 could enter the roots at points of emergence of lateral roots.