Abstract
Soil yeasts exhibit an array of beneficial effects to plants viz., plant growth promotion, phosphate solubilization, nitrogen and sulphur oxidation, etc. Yeasts remain as poorly investigated group of microorganisms that represent an abundant and dependable source of bioactive/chemically novel compounds and potential bioinoculants. Hence this study holds the key concept of assessing the performance of soil yeasts with potential plant growth promoting ability in soil quality improvement. Sixteen soil yeast isolates with plant growth promoting traits were assessed for biofilm forming potential and five potential soil yeast isolates were selected and identified through molecular technique. Soil incubation study was performed with these isolates to assess their impact on soil physical, chemical and biological properties. Due to inoculation of soil yeasts, notable changes were observed in soil physical, chemical and biological properties. Among the soil yeast isolates, Pichia kudriavzevii gave better results in soil incubation study.
Highlights
Environment safety has become the most important aspect of all the growing nations
Till the soil aggregation studies are mainly focused with respect to organisms like earthworms, AM fungi, bacteria and very few studies reported on fungi
The results of the biofilm formation assay performed at particular time intervals viz., 5th day, 10th day and 15th day indicated that the ratio of biofilm producing cells and planktonic cells of the yeast isolates decreased from 5th day 15th day
Summary
Environment safety has become the most important aspect of all the growing nations. Organic farming is one of the growing strategies all over the world to conserve the health of human beings and soil health too. Microbial inoculants are used for plant growth promotion and soil health improvement in organic farming. The contribution of organic matter by microorganisms to soil through production of extracellular polymeric substances plays a pivotal role in improving the soil structure. The extracellular polymeric substances secreted by the soil microbes serve as cementing agent to form soil aggregates. Certain yeasts are known to affect the soil physical property by producing high quantity of extracellular polymeric substances. Physical forces, chemical bonds and biological agents of the soils are considered as the causes of soil aggregation. With this background, the present study was formulated to study the role of soil yeasts in improving soil physical, chemical and biological properties
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