某些生物因子对苕子根瘤菌菌剂和土著根瘤菌竞争结瘤的影响

早在本世纪三十年代,国外已发现根瘤菌竞争结瘤的现象,并对三叶草根瘤菌品系之间的竞争结瘤进行了系统的研究。认为同时接种两个不同的根瘤菌品系,它们的结瘤率是取决于各个品系入侵竞争能力的大小,并引出了竞争优势种的概念。之后,随着免疫学、遗传标记和抗药标记等方法的相继应用,对竞争结瘤问题进行了深入的研究。

INFLUENCE OF SOME BIOLOGICAL FACTORS ON THE COMPETITION OF NODULATION OF VETCH BETWEEN INOCULANTS AND INDIGENOUS STRAINS OF RHIZOBIA

This article deals with some biological factors affecting the competition of nndulation between different strains of Rh. leguminosarum on vetch. The results are summarized as follows: 1. Nodulation competition of Rhizobium is mainly affected by the host plant. It is shown that host plants are quite susceptible to definite strains of Rhizobium, either in the case of a definite strain infecting different species o.f plant or in the case of various strains infPeting the same species of host plant. And, the susceptibilities of the Rhizobium to different species of host plant are more sensitive than that to the varieties of host plant.2. Rate of nodulation of the inoculant is decreased with the increase of the amount of native strains in soil. 3. Rate of nodulation is increased with the increase of the amount of inoculant applied in soil where native strains are populated. But, it is not true by seed inoculalion under the same soil condition.