Zhulin I B, Lois A F, Taylor B L
Department of Microbiology and Molecular Genetics, School of Medicine, Loma Linda University, CA 92350, USA.
FEBS Lett. 1995 Jun 26;367(2):180-2. doi: 10.1016/0014-5793(95)00561-m.
Rhizobium meliloti cells responded to an abrupt change in oxygen concentration by changing the cell speed (chemokinesis), but they did not alter the frequency at which swimming cells stopped briefly (aerotaxis). Changes in cell speed upon stimulation with oxygen coincided with changes in membrane potential. The cells did not form an aerotactic band in a spatial gradient of oxygen as do the cells of other bacterial species. The fixL and fixJ genes which encode a heme-containing protein kinase that senses oxygen and a response regulator, respectively, were not involved in the behavior of R. meliloti in oxygen gradients.
苜蓿根瘤菌细胞通过改变细胞速度（趋化运动）对氧气浓度的突然变化做出反应，但它们不会改变游动细胞短暂停止的频率（趋氧性）。氧气刺激后细胞速度的变化与膜电位的变化一致。与其他细菌种类的细胞不同，苜蓿根瘤菌细胞在氧气的空间梯度中不会形成趋氧带。分别编码一种感知氧气的含血红素蛋白激酶和一种反应调节因子的fixL和fixJ基因，不参与苜蓿根瘤菌在氧气梯度中的行为。
