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2014 | 36 | 01 |

Tytuł artykułu

Plant growth promoting rhizobacteria alleviate salinity induced negative effects on growth, oil content and physiological status in Mentha arvensis

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
This study was aimed to investigate the effect of inoculation on three salt-tolerant, plant-growth-promoting rhizobacteria (PGPR) STR2 (Bacillus pumilus), STR8 (Halomonas desiderata) and STR36 (Exiguobacterium oxidotolerans), for their growth-promoting potential and efficacy in augmenting salt tolerance in Mentha arvensis, an essential oil-bearing crop and natural source of l-menthol, under varying levels of NaCl stress (0, 100, 300 and 500 mM) imposed through irrigating water. Increase in the levels of salt concentration led to a decrease in the growth, fresh weight, leaf–stem ratio, oil content and yield. However, the negative effects of salinity were observed to be convalesced in the PGPR inoculated plants. At salinity levels of 100 and 300 mM NaCl, H. desiderata inoculated plants recorded the highest herb yield, whereas at 500 mM NaCl, the plants inoculated with E. oxidotolerans yielded maximum herb. The oil content in non-inoculated, salt-stressed plants was observed to be 0.46, 0.42 and 0.35 % at 100, 300 and 500 mM NaCl, respectively, whereas the plants inoculated with H. desiderata recorded the oil content of 0.71 and 0.60 and 0.48 % at similar levels of NaCl stress, respectively. The halotolerant PGPR minimized the deleterious effects of salt toxicity producing at par or higher yields at lower and medium salinity levels (100, 300 mM NaCl) than the un-inoculated non-salt-stressed plants through improved foliar nutrient uptake and enhanced antioxidant machinery. Based on the results of the experiments reported herein, the use of salt-tolerant, plant-growth-promoting bacteria may provide an effective means of facilitating M. arvensis growth in salt-stressed environments.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

36

Numer

01

Opis fizyczny

p.45-60,fig.,ref.

Twórcy

autor
  • Microbial Technology and Entomology Department, CSIR-Central Institute of Medicine and Aromatic Plants, P.O.CIMAP, Lacknow 226015, India
autor
  • Microbial Technology and Entomology Department, CSIR-Central Institute of Medicine and Aromatic Plants, P.O.CIMAP, Lacknow 226015, India
autor
  • Microbial Technology and Entomology Department, CSIR-Central Institute of Medicine and Aromatic Plants, P.O.CIMAP, Lacknow 226015, India
autor
  • Central Instrument Facility, CSIR-Central Institute of Medicine and Aromatic Plants, P.O.CIMAP, Lacknow 226015, India
autor
  • Microbial Technology and Entomology Department, CSIR-Central Institute of Medicine and Aromatic Plants, P.O.CIMAP, Lacknow 226015, India

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Bibliografia

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