福建省农科院土肥所经过多年筛选研究,发现若干水稻品种的根组织内部棲息着许多固氮菌。经用乙炔还原法和氮同位素示踪,测定出其中的某些菌株具有较强的固氮能力,并证实它对稻株有供氮作用。经电镜观察,确认M—Sm—1612等固氮菌可在稻根皮层细胞中生长繁殖。 Fujian Academy of Agricultural Sciences after many years of soil fertility screening studies found that a number of rice varieties within the root tissue of many nitrogen-fixing bacteria. After acetylene reduction and nitrogen isotope tracing, some of them were found to have strong nitrogen fixation ability and confirmed that it had nitrogen supply to rice plants. Observed by electron microscopy, it was confirmed that Azotobacter such as M-Sm-1612 could grow and propagate in rice root cortex cells.