EFFECTS OF VARIOUS BACTERIAL INOCULANTS ON GROWTH AND YIELD OF WHEAT PLANTS (Triticum aestivum) GROWN UNDER DIFFERENT SALINITY LEVELS | ||||
| Journal of Plant Production | ||||
| Article 6, Volume 29, Issue 1, January 2004, Page 145-173 PDF (380.97 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2004.238471 | ||||
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| Authors | ||||
| M. Z. Sedik,1; M. R.A. Nesiem2 | ||||
| 1Microbiology Dept., Fac. of Agric., Cairo Univ., Giza, Egypt. | ||||
| 2Plant Physiology Sec., Botany Dept., Fac. of Agric., Cairo Univ., Giza, Egypt. | ||||
| Abstract | ||||
| There is increasing attention to accommodate wheat cultivars to grow in salinities 0 utside the natural range 0 f tolerance too btain a n appropriate economic yield. Accordingly, a gnotobiotic experiment was conducted to study the effect of using different bacterial strains, isolated from saline soils, i.e. plant growth promoting rhizobacteria (Klebsiella pneumoniae) either alone or in combination with N2-fixing (Azospirillum brasilense + Azotobacter chroococcum) 0 r phosphate dissolving (Bacillus m egatherium) or with both (composite), as inoculation treatments for one week-old wheat seedlings (Tn"ticum eestivutn L.) cv, Giza 163 growing under different levels of seawater, i.e. 0, 3, 6 and 12 csm". In addition, a pot experiment was carried out using the previous bacterial strains treatments for inoculation of wheat grains as well as for soil pots of wheat plants (2 and 6 weeks-old) grown under the same aforementioned levels of seawater. In gnotobiotic experiment, the results of total bacterial counts as well as of nitrogenase activity indicated that with increasing salinity level, there were corresponding reductions in total bacterial counts as well as of nitrogenase activity were detected. Meanwhile, higher values of total bacterial counts as well as of nitrogenase activity were obtained from wheal plants inoculated with composite or Klebsiella + Nrfixers inocula as compared whether with un inoculated or the other inoculation treatments under different salinity levels. In the pot experiment, the microbiological study revealed that numbers of total bacterial counts were decreased with increasing salinity level. The highest total bacterial counts adhering to roots were recorded at nine weeks of growth period for wheat plants inoculated with composite inocula under different salinity levels. Inoculation with various bacterial strains as grain coa~ing treatments increased the germination percentage under different salinity levels as compared each with uninoculated one. Under different salinity levels, the mean values of germination percentage of wheat grains as well as different studied growth characters of wheat plants showed a significant progressive reduction with increasing salinity levels. Moreover, the mean values of total N, P, K+ and Ca+2 concentrations decreased whereas, Mg+2, Na", reducing and total sugar, free amino acids as well as free proline concentrations increased in roots and shoots of wheat plants. Also, the endogenous IAA and cytokinins concentrations decreased, whereas endogenous ABA increased in wheat shoots under different salinity levels. This was reflected on a significant | ||||
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