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In this study 98 rhizospheric actinomycetes were isolated from different wheat and tomato fields, Punjab, Pakistan. The isolates were characterized morphologically, biochemically, and genetically and were subjected to a comprehensive  in vitro  screening for various plant growth promoting (PGP) traits. About 30% of the isolates screened were found to be the promising PGP rhizobacteria (PGPRs), which exhibited maximum genetic similarity (up to 98–99%) with different species of the genus  Streptomyces  by using16S rRNA gene sequencing. The most active indole acetic acid (IAA) producer  Streptomyces nobilis  WA-3,  Streptomyces Kunmingenesis  WC-3, and  Streptomyces enissocaesilis  TA-3 produce 79.5, 79.23, and 69.26 μg/ml IAA respectively at 500 μg/ml L-tryptophan. The highest concentration of soluble phosphate was produced by  Streptomyces  sp. WA-1 (72.13 mg/100 ml) and  S. djakartensis  TB-4 (70.36 mg/100 ml). All rhizobacterial isolates were positive for siderophore, ammonia, and hydrogen cyanide production. Strain  S. mutabilis  WD-3 showed highest concentration of ACC-deaminase (1.9 mmol /l). For  in-vivo  screening, seed germination, and plant growth experiment were conducted by inoculating wheat ( Triticum aestivum ) seeds with the six selected isolates. Significant increases in shoot length was observed with  S. nobilis  WA-3 (65%), increased root length was recorded in case of  S. nobilis  WA-3 (81%) as compared to water treated control plants. Maximum increases in plant fresh weight were recorded with  S. nobilis  WA-3 (84%), increased plant dry weight was recorded in case of  S. nobilis  WA-3 (85%) as compared to water treated control plants. In case of number of leaves, significant increase was recorded with  S. nobilis  WA-3 (27%) and significant increase in case of number of roots were recorded in case of strain  S. nobilis  WA-3 (30%) as compared to control plants. Over all the study revealed that these rhizospheric PGP  Streptomyces  are good candidates to be developed as bioferlizers for growth promotion and yield enhancement in wheat crop and can be exploited for the commercial production of different agro-active compounds.

Screening of Rhizospheric Actinomycetes for Various In-vitro and In-vivo Plant Growth Promoting (PGP) Traits and for Agroactive Compounds