Novel bioproduct of bacterial antagonist amended in growing soil promotes plant growth and induces plant resistance against diseases of rice
2010
Kasem, S. | Prathuangwong, S., Kasetsart Univ., Bangkok 10900 (Thailand). Dept. of Plant Pathology
Two-bacterial antagonist strains, Bacillus sp D10 from rice rhizosphere obtained in this study and the commerical strain Pseudomonas fluorescens SPOO7s that have proven ability to suppress rice diseases in the paddy, were subjected to cross linked matrix with several inexpensive organic carriers for development of a novel bioproduct for soil improvement. These 2 strains survived in the selected best product (dry cow dung: rice bran chaff:rice husk ash dust:coir dust:decomposed plant matter with 1:1:4:4:10 by volume) at 2 x 1013 cfu/ml for 120-day at room temperature. Greenhouse experiments with either SP007s or D10 products amended in grown soil at ratio 1:10 by volume significantly enhanced plant growth with increased seed germination and seedling vigor including stem height, root length, fresh weight, and long leaf of rice (P=0.05). When rice plant assays were employed with these strain products applied as single soil amendment (1:10 by volume) and combined with cell suspension by seed treatment (1 x 104 cfu/ml) and foliar spray (1 x 108 cfu/ml), the significant reduction of 2 diseases wheath blight and leaf blight caused by Rhizoctonia solani and Xanthomonas oryzae pv. oryzae respectively were found in correlation with increase of defense-related enzymes including phenolic compound, beta-1,3-glucanase, and peroxidase in rice leaves. This demonstrates that strains SPOO7s and D10 are in the efficient delivery system of either organic carrier or application fitness for enhance plant growth and biocontrol activity.
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