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促生细菌对植物的促生作用方面 英文文章 需翻译成中文
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1、Preliminary studies revealed the salt tolerance of different cultures. Research work that tested the PGP potential of the isolates and at the same time eliminated isolates that did not show desired characteristics was systematically carried out. Solubilization of phosphates by rhizobacteria was observed by 15 isolates. A decrease in the pH of the liquid medium was observed in all 15 isolates. However, no correlation between P solubilization and pH reduction was observed by Tank and Saraf (2003). Similarly, El-Azeem and others (2007) reported that all 81 isolates studied for the solubilization of TCP were able to solubilize TCP in broth cultures (quantitative method), 53 isolates solubilized phosphate in solid medium (qualitative method), and the pH values of the cultures were reduced from the initial value of 7.1 to values that varied between 4.16 and 6.45. On the other hand, Rajankar and others (2007) reported that bacteria like Bacillus subtilis and Bacillus megatherium isolated from the saline belt of the Purna River Basin were able to solubilize phosphate and release a minute quantity of acid that reduced the salinity of the soil by neutralization. 2、Only 13 of the 15 isolates were able to produce ironchelating substances, that is, siderophores, which were found to be the hydroxamate type. However, only 10 were found to produce phytohormones (IAA) and maximal levels were produced by MSC4. Similarly, Chandra and others (2007) reported that Mesorhizobium loti MP6, isolated from root nodules of Mimosa pudica, showed production of the hydroxamate type of siderophore. Pseudomonas putida produced siderophore and induced systemic resistance in watermelon against gummy stem rot, whereas the siderophore-negative mutants failed to induce resistance (Lee and others 2005). Sarode and others (2009) reported that during a screening study of PGPR, of 32 strains, 8 were able to grow in iron-deficient medium and produce siderophore. Maximum siderophore production was observed by Acinetobacter calcoaceticus, which was shown to produce the catechol type of siderophore. Datta and Basu (2000) reported that a decrease in IAA production in Rhizobium sp. from Cajanus cajan after 72 h might be due to the release of IAA-degrading enzymes such as IAA oxidase and peroxidase. |
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wildwolf110
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爱与雨下(金币+2): 2011-11-08 21:20:34
ydd1982(金币+120, 翻译EPI+1): 2011-11-12 21:45:08
爱与雨下(金币+2): 2011-11-08 21:20:34
ydd1982(金币+120, 翻译EPI+1): 2011-11-12 21:45:08
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1 初步的研究揭示了不同培养基下的耐盐性。对测试的菌株的PGP潜力，同时淘汰隔菌株进行研究，并没有显示所需的特点是有步骤地进行的。观察15株由磷酸盐溶解的生菌，在所有15个菌株的液体介质中pH值下降，然而，Tank and Saraf (2003)并没有观察到磷溶解和pH值的降低的关系，同样，EL – Azeem等人报道说，所有研究的81棵菌株，在肉汤培养基中（定量方法），增溶的TCP能够溶解TCP，并且培养基pH值由初始值7.14.降低到4.16和6.45之间。另一方面，Rajankar等人报道（2007）， 细菌如枯草芽孢杆菌和巨大芽胞杆菌，取自Purna流域的盐碱地带 ，能够溶解磷酸盐和通过释放微量的酸中和碱来减少土壤盐碱化。 2 15株中只有13株能够产生铁螯合物，那就是说，发现铁载体为氧肟型 ，然而，发现只有10株产生激素（IAA），最大量由MSC4产生。同样，钱德勒等人报道（2007），百脉根根瘤菌MP6，分离于含羞草的根瘤，显示生产肟酸型铁载体 。恶臭假单胞菌产生铁载体，并且在西瓜中诱导系统抗对胶粘茎腐病抵抗，而铁载体阴性突变体不能诱导抵抗（李等人）。Sarode等人报道（2009），在PGPR的筛选研究期间，32株中的8株能够生长在缺铁介质中产生铁载体。在醋酸钙不动杆菌中观察到最大量的铁载体，产生的是邻苯二酚型的铁载体，达塔和巴苏（2000）报道，在木豆中72小时后，观察到根瘤菌IAA产量下降，这可能是由于IAA降解酶如IAA氧化酶和过氧化物酶的释放造成的。 |
2楼2011-11-08 16:57:22