Screening of Rhizobacteria Associated with Cassava for Plant Growth Promotion and Biocontrol Potential

Authors

  • S P Suja Central Tuber Crops Research Institute (ICAR-CTCRI), Sreekariyam, Thiruvananthapuram - 695017, Kerala, India
  • Vinayaka Hegde Vinayaka Hegde, Acting HD (Crop Protection). CPCRI, Kasargod, Kerala
  • Makes Kumar THANGARAJ Principal Scientist Division of Crop Protection Central Tuber Crops Research Institute (ICAR-CTCRI), Sreekariyam, Thiruvananthapuram - 695017, Kerala, India
  • Anjanadevi IP Central Tuber Crops Research Institute (ICAR-CTCRI), Sreekariyam, Thiruvananthapuram - 695017, Kerala, India

Keywords:

PGPR, plant growth promoting traits, seed germination, cassava

Abstract

Plant growth promoting rhizobacteria (PGPR) are beneficial bacteria that colonise plant roots and  enhance plant growth by 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. In  the present study, rhizobacteria associated with five varieties of cassava, viz., Sree Padmanabha,Sree Vijaya, Sree Jaya, Sree Rekha and Sree Prakash were isolated and screened for their plant  growth promotion traits and in vitro biocontrol potential. A total of 41 isolates were selected based on  colony morphology and designated as RB1 to RB41. These isolates were screened in vitro for their  plant growth promoting traits like production of indole acetic acid (IAA), ammonia (NH3), phosphate  solubilisation, hydrogen cyanide (HCN) and antifungal activity. Cowpea seeds were treated with  rhizobacteria to assess seed germination and growth of seedlings. A pot experiment was conducted  with cassava variety, Sree Vijaya, where stem cuttings were treated with rhizobacteria followed by asoil drench. About 88% of the isolates produced IAA, 83% produced ammonia and 50% solublized P.  Only one isolate produced HCN and nine isolates showed antifungal activity against the plant pathogen,  Sclerotium rolfsii. Rhizobacterial treatments promoted the germination in cowpea and growth in  cassava.The present study suggests that PGPR isolates might have potential in future field applications  as plant growth promoters or as biocontrol agents.

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Published

2015-01-15

How to Cite

Suja, S. P., Hegde, V., THANGARAJ, M. K., & IP, A. (2015). Screening of Rhizobacteria Associated with Cassava for Plant Growth Promotion and Biocontrol Potential. JOURNAL OF ROOT CROPS, 40(1), 66–73. Retrieved from https://ojs338.isrc.in/index.php/jrc/article/view/224

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