Possible roles of nitrogen fixation and mineral uptake induced by rhizobacterial inoculation on salt tolerance of maize

• Autorzy: El-Komy H M A , Abdel-Samad H.M. , Hetta A.M.A. , Barakat N.A.
• Języki publikacji: EN

Abstrakty

EN

Pot experiments were conducted to evaluate the possible roles of nitrogen fixation and/or enhanced mineral uptake by Azospirillum lipoferum and Bacillus polymexa inoculation in improving salt tolerance of maize plants. Plants were inoculated and grown under salt stress (osmotic potential: -0.3, -0.6, -0.9 and -1.2 Mpa). Both microorganisms were able to fix nitrogen up to -0.9 Mpa salinity level accompanied with increased total N-yield compared with the control plants. In order to investigate the role of bacterial inoculation on enhanced mineral uptake, the growth and some physiological parameters of inoculated plants were compared with plants fertilized by K and P foliar application. Plant inoculation with the N₂-fixers or plant spraying with KH₂PO₄ resulted in an increase in fresh and dry matter as well as water content of plants. Treated plants exhibited changed plant mineral content which was associated with increased Mg/K and decreased P/K, Ca/K and Na/K ratios. This was accompanied by accumulation of soluble sugars, amino acids in shoots and roots of plants resulting in a concomitant increase in the osmotic potential of the cell sap as a possible mechanism of adaptation to salinity.

Słowa kluczowe

EN

salt tolerance; salt stress; maize plant; nitrogen fixation; drought tolerance; Azospirillum lipoferum; rhizobacteria; pot experiment; Bacillus polymyxa; maize; plant

• Wydawca: -
• Czasopismo: Polish Journal of Microbiology
• Rocznik: 2004
• Tom: 53
• Numer: 1
• Opis fizyczny: p.53-60,fig.,ref.

Twórcy

autor

El-Komy H M A

• Minia University, Minia, 61519, Egypt

autor

Abdel-Samad H.M.

autor

Hetta A.M.A.

autor

Barakat N.A.

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