EFFECTS OF SALINITY ON NITROGEN FIXATION SYSTEM OF AGROBACTERIUM TUMEFACIENS IN BAMI AND AMERICAN CULTIVARS OF ALFALFA (MEDICAGO SATIVA L.)

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MOTAHARI M.; SHOSHTARI A.N.; KALANTARI M.

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Journal: IRANIAN JOURNAL OF BIOLOGY Year:2004 | Volume:17 | Issue:1 Page(s): 34-48

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Title

EFFECTS OF SALINITY ON NITROGEN FIXATION SYSTEM OF AGROBACTERIUM TUMEFACIENS IN BAMI AND AMERICAN CULTIVARS OF ALFALFA (MEDICAGO SATIVA L.)

Author(s)

MOTAHARI M. | SHOSHTARI A.N. | KALANTARI M. | Issue Writer Certificate

Keywords

ALFALFAQ2

SALINITYQ2

BIOLOGICAL NITROGEN FIXATIONQ4

Abstract

Effect of SALINITY (sodium chloride) on growth and BIOLOGICAL NITROGEN FIXATION (BNF) was investigated in roots of ALFALFA (Bami and American cultivars) inoculated by six different strains of Sinorhizobium bacteria. These strains contain a wild type named S me/iloti Wild type (S392), two mutated strains S me/iloti nifK (S259) and S.me/iloti nifH(S237), which were without plasmid and three strains W T(pSRK9), nifK (pSRK9) and nifH (pSRK9), with plasmid. This experiment designed using a factorial model in randomized complete blocks with four replicates. SALINITY treatments were 0, 50, 100 mM sodium chloride. In this experiment, vermiculite culture with combination of FP nutrient solution (without nitrogen) was used. The pots were arranged randomly in a growth chamber with a 16-8 h light-dark cycle, 23-20˚ C day-night temperature, relative humidity 44% and 15 Klux light density. Seedlings were harvested after 50 days and active nodule number, shoot length, dry weight of whole plant, sugar, content of root, total protein of root and shoot and K+ /Na + ratio of root and shoot were measured. Data analysed with SPSS software version 9. Results showed that dry weight production in SALINITY treatments of 0, 50 mM were the same. Mean comparison for active nodule number, dry weight of whole plant and sugar content of root about Bami and American cultivars of ALFALFA showed that both cultivars of ALFALFA inoculated with nifK (pSRK9) strain had better than that of others, because they produced higher active nodule number, dry weight and sugar content of root in SALINITY treatments of 50, 100 mM sodium chloride. In experiment conditions, American cultivar that inoculated with nifK (pSRK9) strain showed high total protein of root and shoot in SALINITY treatment of 100 mM sodium chloride. Measurement of K+ /Na +ratio of root and shoot showed that American cultivar inoculated with nifK (pSRK9) and W. T(pSRK9) strains and Bami cultivar inoculated with nifK (pSRK9) strain produced higher K+ /Na + ratio with increasing SALINITY. It seems that symbiosis between Bami and American cultivars of ALFALFA with nifK (pSRK9) and W T (pSRK9) strains improved nodulation, growth and BIOLOGICAL NITROGEN FIXATION under salt stress. Results showed that inoculation of ALFALFA plants with high SALINITY tolerant of Sinorhizobium meliloti bacteria which were transfered with the plasmid contain the genes that are able to fix nitrogen can improve plant production under SALINITY.

Cites

EFFECTS OF TOXIC CONCENTRATIONS OF CADMIUM ON NODULATION AND NITROGEN FIXATION OF DIFFERENT STRAINS OF SINORHIZOBIUM MELILOTI IN MEDICAGO SATIVA

References

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APA: Copy

MOTAHARI, M., SHOSHTARI, A.N., & KALANTARI, M.. (2004). EFFECTS OF SALINITY ON NITROGEN FIXATION SYSTEM OF AGROBACTERIUM TUMEFACIENS IN BAMI AND AMERICAN CULTIVARS OF ALFALFA (MEDICAGO SATIVA L.). IRANIAN JOURNAL OF BIOLOGY, 17(1), 34-48. SID. https://sid.ir/paper/21496/en

Vancouver: Copy

MOTAHARI M., SHOSHTARI A.N., KALANTARI M.. EFFECTS OF SALINITY ON NITROGEN FIXATION SYSTEM OF AGROBACTERIUM TUMEFACIENS IN BAMI AND AMERICAN CULTIVARS OF ALFALFA (MEDICAGO SATIVA L.). IRANIAN JOURNAL OF BIOLOGY[Internet]. 2004;17(1):34-48. Available from: https://sid.ir/paper/21496/en

IEEE: Copy

M. MOTAHARI, A.N. SHOSHTARI, and M. KALANTARI, “EFFECTS OF SALINITY ON NITROGEN FIXATION SYSTEM OF AGROBACTERIUM TUMEFACIENS IN BAMI AND AMERICAN CULTIVARS OF ALFALFA (MEDICAGO SATIVA L.),” IRANIAN JOURNAL OF BIOLOGY, vol. 17, no. 1, pp. 34–48, 2004, [Online]. Available: https://sid.ir/paper/21496/en

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