Symbiotic nitrogen fixation of faba bean plants inoculated with salt-tolerant rhizobium isolates [electronic resource].

Includes references.

Rhizobium leguminosarum biovar viciae isolated from salt-affected faba bean fields were in vitro tested. Different isolates were found to be varied in their tolerance to salinity. F1 and E1 were found to be the most salt-tolerant isolates even at EC-level of 12 ds m-1. Seeds of Nubaria 1 cv. were inoculated with either F1 or E1 in comparison with a less salt-tolerant one (F9) in pots their salinity were adjusted at 0, 3, 6, 9 and 12 ds m-1 under aseptic conditions. Number and dry weight of nodules were decreased strongly by increasing salinity levels in comparison with control. Significant enhancement of N % accumulated in the shoots was also noticed due to the biological inoculation with both Rhizobium isolates in presence or absence of salinity. Under non-aseptic conditions, efficacy of F1 and E1 with the effect of mineral N-supply (25 and 100 %) was compared. In addition to Nubaria 1 cv., Sakha 1 cv. was also used in the evaluation process for N-fixation at 0,6, 9 ds m-1 levels. Number of nodules formed on Nubaria 1 at 9 ds m-1 was highly increased from 7.86 and 5.44 for 25 and 100 % N-supply to 82.33 and 93.33 for F1 and E1, respectively. Keywords: Vicia Faba, Rhizobium, salinity, mineral N-supply

Summary in Arabic.

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