Journal of Pure and Applied MicrobiologyVol. 9 No. 3

Evaluation of Drought Resistance and Yield in PGPR-Primed Seeds of Festuca arundinacea Schreb under Different Levels of Osmotic Potential and Field Capacity

Hadi Radnezhad1*, Forogh Mortazaeinezhad2, Ali Asghar Naghipour3, Behzad Behtari4 and Maryam Foroughi Abari1

1Department of Environmental Sciences, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. 2Department of horticulture, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. 3Ph.D Student in Range Sciences and Member of Young Researchers Club Islamic Azad University, Isfahan(khorasgan)Branch, Iran. 4Ph.D Candidate of Rangeland Science and Management, Faculty of Natural Resources, Sari Agricultural sciences and Natural Resources University (SANRU), Iran.

Received on 23 May 2015 and accepted on 08 July 2015

 

ABSTRACT

Plant growth promoting rhizobacteria (PGPRs) are a group of bacteria that can actively colonize plant roots and can modulate plant growth. The present study was conducted to examine the effects of bio-priming with Azotobacter and Azospriliumon on the yield and resistance to drought stress of F. arundinacea Schreb seeds under different four levels of osmotic potential such as 0.5,1,1.5 and 2 Mpa that created using the polyethylene glycol. Seeds treated for 2 and 4 days. Drought stress on the field capacity, in the four levels of 100%, 75%, 50% and 25% of field capacity was applied during plant growth. The results showed that bio-priming treatments in the traits of root length, stem length and fresh stem weight improved yield and increased resistance to drought stress as compared to control. Both types of bacteria Azospirillum and Azotobacter significantly increased yield compared to control. The performance of Azotobacter was relatively higher than in Azospirillum. With regard to F. Arundinacea species seeds treated with Azotobacter 2 and 0.5 MPa for 2 days were identified as the superior treatments.

Keywords : Azotobacter, Azosprilium, Bio-priming, Drought stress, field capacity.