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首页> 外文期刊>Applied and Environmental Microbiology >Bradyrhizobia Nodulating the Acacia mangium × A. auriculiformis Interspecific Hybrid Are Specific and Differ from Those Associated with Both Parental Species
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Bradyrhizobia Nodulating the Acacia mangium × A. auriculiformis Interspecific Hybrid Are Specific and Differ from Those Associated with Both Parental Species

机译：根瘤菌根瘤菌×马尾曲霉种间杂种的缓生根瘤菌是特异的，不同于与两个亲本物种有关的杂种

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摘要

In the context of an increasing utilization of the interspecific hybrid Acacia mangium × A. auriculiformis as a plantation tree in the tropical humid zone, its symbiotic characterization was carried out in comparison with that of its two parental species. Rhizobium strains of diverse geographical origins were isolated from root nodules of the hybrid and its parents. Almost all Acacia hybrid isolates were fast growing on yeast extract-mannitol medium, in contrast to those isolated from both parental species, which were mostly slow growing. The rhizobium strains were characterized through partial sequencing of the rRNA operon. In the phylogenetic tree, almost all strains isolated from the hybrid were grouped together in a clade close to Bradyrhizobium japonicum, while all strains isolated from both parental species were close to Bradyrhizobium elkanii. Inoculation experiments performed under in vitro or greenhouse conditions showed that all strains were infective with their original hosts but exhibited very variable degrees of effectivity according to the host plant tested. Thus, homologous strain-host associations were more effective than heterologous ones. This shows that there is still a high potential for isolating and testing new strains from hybrids to be used as inoculants in the context of large-scale afforestation programs.
机译：在种间杂种金合欢×金合欢作为热带湿润地区的人工林被越来越多地利用的背景下，与其两个亲本物种的共生特性进行了比较。从杂种及其亲本的根瘤中分离出具有不同地理起源的根瘤菌菌株。与从两个亲本物种中分离的菌株相比，几乎所有的金合欢杂种分离物都在酵母提取物-甘露醇培养基上快速生长，而后者大多生长缓慢。根瘤菌菌株通过rRNA操纵子的部分测序来表征。在系统发育树中，从杂种中分离的几乎所有菌株都在靠近日本短枝根瘤菌的进化枝中归为一类，而从两个亲本物种中分离出的所有菌株都接近伊卡氏根瘤菌。在体外或温室条件下进行的接种实验表明，根据所测试的寄主植物，所有菌株均对其原始寄主具有感染力，但表现出非常不同的有效程度。因此，同源菌株-宿主关联比异源宿主更有效。这表明在大规模造林计划的背景下，从杂种中分离和测试新菌株用作孕育剂的潜力仍然很大。

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