Growth Promoting Trait of Yeasts Isolated from Tomato in Relation to IAA Production

Yeasts are the useful microorganism widely present in nature and are the common inhabitants of soil, vegetation, and other environments. Through this study, thirty yeast isolates were isolated from phylloplane, fructoplane and as endophyte from leaves and fruits of tomato plant. The most effective one in promoting plant growth and IAA production was recorded in the isolate PY 15 (11.35±0.495 µg/mL) and it was followed by PY14 (10.38±0.452 µg/mL) and least recorded in the FY1 (0.53±0.03 µg/mL) isolate. Among the various isolates tested in vitro for the promotion of growth, the highest root and shoot length of 7.56±0.007 cm and 31.79±0.802 cm was recorded in the effective isolate PY15. The effective isolate (PY15) was identified as Meyerozyma guilliermondii (QR485249) based on morphological and molecular characterization. This study result concluded with statement that yeast strains found to promote plant growth by IAA production and could be considered for the development of biological products to enhance plant growth and to replace/reduce the use of synthetic fertilizers in the market.