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Journal of Applied Sciences
Year: 2006  |  Volume: 6  |  Issue: 13  |  Page No.: 2794 - 2798

Role of Biological Control on Some Physiological Aspects of Zea mays Infected by Rhizoctonia solani

Faten A. El-Daly and Nahed Haikal    

Abstract: The results revealed that treatment with either Trichoderma harzianum or Bacillus subtilis by soil inoculation or grain coating significantly increased the percentage of healthy seedlings as well as the length, fresh and dry weight of seedlings. Photosynthetic pigments content of the leaves significantly increased in absence of Rhizoctonia solani alone. The same almost applied to soluble sugar content, amino acid content or total nitrogen of the seedlings, though less apparent or insignificant when the grains were treated with B. subtilis before growing in soil treated with 3% R. solani. R. solani lowered the test elemental content of Zea mays seedlings, while the reverse was most prominent by sowing the grains in soil amended with R. solani and T. harzianum. The results also revealed that infestation by Rhizoctonia solani significantly lowered the length of the ears and weight of 100 grains. In the mean time the weight of 100 grains significantly dropped; a response that was hardly, if at all affected by implying R. solani with Bacillus subtilis or T. harzianum. The presence of the three microorganisms increased the fresh weight of the ears but the total count or weight of the grains was lowered. The presence of R. solani in soil lowered the lipid, total carbohydrates and protein content of corn flour. Meanwhile using the biological control agents T. harzianum or B. subtilis or both initiated the increase of these components.

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