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首页> 外文期刊>African Journal of Biotechnology >Screening of rhizobacteria containing plant growth promoting (PGPR) traits in rhizosphere soils and their role in enhancing growth of pigeon pea
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Screening of rhizobacteria containing plant growth promoting (PGPR) traits in rhizosphere soils and their role in enhancing growth of pigeon pea

机译：根际土壤中含有植物生长促进（PGPR）特性的根际细菌的筛选及其在促进木豆生长中的作用

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Plant growth promoting rhizobacteria (PGPR) are beneficial bacteria that colonize plant roots and enhance plant growth with a wide variety of mechanisms. The use of PGPR is steadily increasing in agriculture and offers an attractive way to replace chemical fertilizers, pesticides and supplements. Here, we have isolated, enumerated and characterized the PGPR from the rhizosphere soil of pigeon pea for the enhancement of growth of pigeon pea. Rhizosphere soils were collected from different areas of Samalkot, Pithapuram, Peddapuram and Kakinada. Sixty five?(65)isolates were identified and characterized for their morphological, cultural, staining and biochemical characteristics, of which 35?was?selected for the screening of PGPR isolates. Sixteen isolates were successfully characterized for the PGPR traits like indole acetic acid (IAA) production, phosphorus solubilization, and production of enzymes like urease, chitinase, amylase, cellulase, protease and β-1,3 glucanase and?were?assayed. The antagonistic nature of these strains towards fungi and bacteria were estimated by siderophore estimation, 1-amino-cyclopropane-1-carboxylate (ACC) deaminase characterization, dual plate culture method and HCN production technique, and the best one was selected. These were further investigated to show the PGPR traits in pigeon pea seedling emergence, increase of shoot length, root length, dry matter production of shoot, nodule number and nodule mass. Furthermore, PGPR isolates remarkably increased seed germination of pigeon pea. Among the sixteen isolates, seven were found to be high IAA producing. Six were found to be efficient phosphate solubilizers, five isolates were found to be good antagonistic towards pathogen soil fungi and eight isolates were found to be better in enzyme productions, and thus,?may enhance the mineralization efficiency of soils. Three isolates were shown to be promising in IAA production, phosphate solubilization, antagonism towards fungi, and mineralizing capacity. Thus, this?study suggests the use of these isolates as inoculant biofertilizers which might be beneficial for pigeon pea cultivation as they enhanced the growth and other growth parameters.
机译：促进植物生长的根际细菌（PGPR）是有益的细菌，可在植物的根部定植并通过多种机制促进植物的生长。 PGPR在农业上的使用正在稳步增长，并提供了一种有吸引力的方式来替代化学肥料，农药和补品。在这里，我们从木豆的根际土壤中分离，列举和表征了PGPR，以促进木豆的生长。从Samalkot，Pithapuram，Peddapuram和Kakinada的不同地区收集了根际土壤。鉴定了65个（65）分离株，并对其形态，培养，染色和生化特性进行了表征，其中35个被选择用于PGPR分离株的筛选。已成功鉴定了16个分离株的PGPR特性，如吲哚乙酸（IAA）的产生，磷的增溶以及尿素酶，几丁质酶，淀粉酶，纤维素酶，蛋白酶和β-1,3葡聚糖酶等酶的产生。通过铁载体估计，1-氨基-环丙烷-1-羧酸酯（ACC）脱氨酶表征，双板培养方法和HCN生产技术，评估了这些菌株对真菌和细菌的拮抗特性。对这些进行了进一步的研究，以显示木豆幼苗中PGPR的特性，枝条长度，根长，枝条干物质产量，根瘤数和根瘤质量的增加。此外，PGPR分离物显着增加了木豆的种子发芽。在16株分离株中，发现7株高产IAA。发现六种是有效的磷酸盐增溶剂，发现五种分离物对病原体土壤真菌具有良好的拮抗作用，并且发现八种分离物的酶产生效果更好，因此可以提高土壤的矿化效率。三种分离物显示出在IAA生产，磷酸盐增溶，对真菌的拮抗作用和矿化能力方面很有前途。因此，这项研究表明使用这些分离物作为孕育生物肥料，因为它们可以提高生长和其他生长参数，因此可能对木豆栽培有益。

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