Induction of salt-tolerance in rice by silica treatment
1998
Bonilla, P.S. | Tsuchiya, M. (Philippine Rice Research Inst., Munoz, 3119 Nueva Ecija (Philippines))
The objective of the study was to investigate the possibility of inducing salt-tolerance in rice by silica treatment. A total of ten varieties namely, salt tolerant Kala Rata 1-24, HsiehTso 12, Bhura Rata, SEW 2723-513, IR4595-4-1-13, Joalbanga, and salt susceptible Kati Gotak, Mangasa, Jyothi, and IR28 were used. The 50 ppm Na2SiO3 treatment started at transplanting time until the 14 d salt treatment. The 50 mM NaCl treatment started at 40 days after sowing (DAS). The dry weight increase, amount of Na and Cl in the different plant parts, transpiration stream concentration factor (TSCF) of Na raised to positive power and changes in the cell-wall consituents were observed. Si treatment changed the plant dry weight of K. Gotak and Mangasa at 40 DAS. Based on the dry weight increase, Si treated plants performed better than with no Si treatment after 14 d in 50 mM NaCl. Si treated plants have lower amount of Na and Cl in the different plant parts, especially the leaf blades, except for the Na content of SEW and Joalbanga. Si treatment also improved the TSCF Na raised to the positive power which implies improvement of the membrane selectivity for Na raised to positive power. The modification in the cell-wall constituents by Si treatment before the imposition of salt stress may have contributed to lower TSCF Na raised to the positive power which resulted to reduced Na accumulation and consequently improved the dry weight increase of plants
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