Variation in the effectiveness of symbiotic associations between native rhizobia and temperate Australian Acacia:: within-species interactions
Variation in the effectiveness of symbiotic associations between native rhizobia and temperate Australian Acacia:: within-species interactions
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DOI：
10.1046/j.1365-2664.1999.00409.x
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发表时间：
1999-06-01
影响因子：
5.7
通讯作者：
Brockwell, J
中科院分区：
文献类型：
--
作者：
Burdon, JJ;Gibson, AH;Brockwell, J
1.从任何一个网站收集的不同根瘤菌菌株建立有效的固氮协会与该网站的宿主植物的能力表现出显着的变化，在22个主机相思属物种和几乎所有的67个人口。金合欢属宿主-根瘤菌菌株组合的平均有效性仅为约70%。许多组合要差得多;在少数情况下，最差的组合导致植物不到最佳组合的十分之一。在对8个、4个和9个A. dealbata、银背拟步行虫A. implexa和A.黑猩猩。一个更完整的试验涉及三个种群的A. dealbata、银背拟步行虫A. implexa、黑腹拟步行虫A. A. tagorata、A. mearnsii和A.黑木木。这些接种了一系列根瘤菌菌株以前被证明是高度，中度或弱成功地形成一个有效的协会。结果表明，根瘤菌的寄主种群和根瘤菌来源存在显著的互作效应，但菌株-寄主种群互作效应的证据很少.一般缺乏宿主种群根瘤菌起源的相互作用的影响表明，根瘤菌菌株选择为高度有效的相思树种生长在一个特定的人口通常会表现良好的共生与该物种在其他人口。这将使它们作为接种剂在植被重建和林业方面的实际应用更加困难。在对A. dealbata、银背拟步行虫A. mearnsii和A.黑木在A. dealbata，半同胞家系和根瘤菌菌株之间的相互作用是复杂的，与'本地'来源的菌株比'外国'的表现更好。在A.另一方面，在不同半同胞家系对相同根瘤菌分离物的反应之间检测到唯一的显著差异。主机为基础的变异的发生表明，在相思树育种计划应注意无意中选择影响这些关系的可能性。
1. The ability of different rhizobial isolates collected from any one site to establish effective nitrogen-fixing associations with host-plants from that site showed significant variation in 22 host Acacia species and nearly all of 67 populations. The average Acacia host-Rhizobium strain combination was only about 70% effective. Many combinations were far poorer; in a few cases the worst combination resulted in plants less than one-tenth the size of the best combinations.2. The ability of rhizobial isolates to form effective symbiotic interactions showed marked host population and rhizobial-isolate effects in a study of eight, four and nine populations of A. dealbata, A. implexa and A. mearnsii. A more complete trial involved three populations of each of A. dealbata, A. implexa, A. irrorata, A. mearnsii and A. melanoxylon. These were inoculated with a range of rhizobial isolates previously shown to be highly, moderately or weakly successful in forming an effective association. Evidence of marked host population and rhizobial origin effects was found but there was very little evidence of isolate-host population interaction effects.3. The general lack of host population-rhizobial origin interaction effects suggests that rhizobial strains selected as highly effective for an Acacia species growing in a particular population will generally perform well symbiotically with that species in other populations. This will make their practical application as inoculants in revegetation and forestry situations much easier.4. Significant host-based variability in the ability to form effective symbiotic interactions was detected in comparisons of half-sib families of A. dealbata, A. mearnsii and A. melanoxylon. In the case of A. dealbata, the interaction between half-sib family lines and rhizobial isolates was complex, with 'locally' derived isolates performing better than 'foreign' ones. There were also significant interaction effects, In A. mearnsii, on the other hand, the only significant differences were detected between the response of different half-sib families to the same rhizobial isolate. The occurrence of host-based variability indicates that in Acacia breeding programmes attention should be given to the possibility of inadvertent selection affecting these relationships.