biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 50:713-716, 2006 | DOI: 10.1007/s10535-006-0113-2

Effects of silicon sources on its deposition, chlorophyll content, and disease and pest resistance in rice

S. Ranganathan1, V. Suvarchala1, Y. B. R. D. Rajesh1, M. Srinivasa Prasad2, A. P. Padmakumari2, S. R. Voleti2,*
1 Indian Institute of Chemical Technology, Hyderabad, India
2 Directorate of Rice Research, Rajendranagar, Hyderabad, India

Rice (Oryza sativa L.) was grown in pots with pyridine N-oxide (PNO), 4-morpholino pyridine N-oxide (MNO), and sodium meta silicate as the sources for silicon. Aliquots of these were added in fortnightly intervals to seedlings through anthesis stage. The plants were monitored for plant growth characteristics, chlorophyll content (SPAD values), photosystem 2 activity (variable to maximum fluorescence ratio of dark adapted leaves), and for blast and yellow stem borer resistance. Deposition of silica in the leaves was monitored by scanning electron microscopy and silicon mapping. PNO or MNO application resulted in significant silicon accumulation in leaf bundle sheath cells. Application of PNO and MNO imparted disease and pest resistance by increasing silicon uptake of rice plants.

Keywords: chlorophyll fluorescence induction; 4-morpholino pyridine N-oxide (MNO); Oryza sativa; photosystem 2 efficiency; pyridine N-oxide; silicon accumulation
Subjects: bundle sheath cells; chlorophyll a,b; chlorophyll fluorescence; Oryza sativa; photosystem 2; Pyricularia grisea; silicon deposition

Received: September 29, 2004; Accepted: May 3, 2005; Published: December 1, 2006  Show citation

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Ranganathan, S., Suvarchala, V., Rajesh, Y.B.R.D., Srinivasa Prasad, M., Padmakumari, A.P., & Voleti, S.R. (2006). Effects of silicon sources on its deposition, chlorophyll content, and disease and pest resistance in rice. Biologia plantarum, 50(4), 713-716. doi: 10.1007/s10535-006-0113-2
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