biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 51:142-148, 2007 | DOI: 10.1007/s10535-007-0027-7

Agrobacterium-mediated transformation of indica rice with chitinase gene for enhanced sheath blight resistance

R. Nandakumar1,*, S. Babu1, K. Kalpana1, T. Raguchander1, P. Balasubramanian2, R. Samiyappan1
1 Department of Plant Pathology, Center for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, India
2 Rice Transformation Laboratory, Centre for Plant Molecular Biology, Tamil Nadu Agricultural University, Coimbatore, India

Four rice indica genotypes of local importance were transformed with RC7, rice chitinase cDNA clone through Agrobacterium-mediated gene transfer method using mature seed derived calli as explants. The putative hygromycin resistant calli showed varied level of regeneration efficiency ranging from 2.0 to 7.6 %. The stable integration and expression of RC7 was confirmed through polymerase chain reaction (PCR) and Western analysis. Transformation efficiency ranged from 0.9 to 5.2 %. The expression of RC7 (35 kDa chitinase) in different tissues of transgenic plant (root, sheath and leaf) was proved through Western analysis and in terms of increased chitinase activity. The inheritance of transgene was studied through PCR and Western analysis in transgenic plants of Pusa Basmati 1. Bioassays with transgenic plants of local cultivars exhibited enhanced resistance up to 33.3 % to rice sheath blight pathogen Rhizoctonia solani under glasshouse conditions. Enhanced expression or 3-to 4-fold increased activity of chitinase in transgenic plants was correlated with sheath blight resistance.

Keywords: antifungal activity; Oryza sativa; PCR; Rhizoctonia solani
Subjects: antifungal activity; auxins; chitinase; Oryza sativa; polymerase chain reaction (PCR); Rhizoctonia solani; Western blot analysis

Received: March 7, 2005; Accepted: October 23, 2005; Published: March 1, 2007  Show citation

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Nandakumar, R., Babu, S., Kalpana, K., Raguchander, T., Balasubramanian, P., & Samiyappan, R. (2007). Agrobacterium-mediated transformation of indica rice with chitinase gene for enhanced sheath blight resistance. Biologia plantarum, 51(1), 142-148. doi: 10.1007/s10535-007-0027-7
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