Induction of salt tolerance in rice by silica treatment
1998
Bonilla, P.S. | Tsuchiya, M. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija, 3119 (Philippines). Plant Breeding and Biotechnology Div.)
The study was conducted to investigate the possibility of inducing salt-tolerance in r ice by silica treatment. Ten varieties: salt tolerant Kala-nata 1-24, Hsieh-Tso 12, Bhura Rata, SEW 273-5-13, IR4595-4-1-13, Joalbanga, and salt susceptible Karti Gotak, Mangasa, Jyothi, and IR28 were treated with 50 ppm metasilicate (NaSiO3) from transplanting time until the end of the experiment. The 50 mM NaCl treatment started at 40 days after sowing (DAS) and lasted for 14 d. The dry weight increase, amount of Na+ and Cl- in the different plant parts, transpiration stream concentration factor of Na+(TSCFNa+), and changes in the cell-wall constituents were observed. Under normal condition, silica treatment did not change the plant dry weight at 40 DAS except for K. Gotak and Mangasa, where an increase was observed. However, after 14 d in 50 mM NaCl, silica treatment plants performed better than plants with no silica treated based on dry weight increase. The silica treated-plants have lower amounts of Na+ and Cl- in the different plant parts, especially the leaf blades, except for the Na+ content of SEW and JB. Silica treatment improved the TSCFNa+ which implies improvement of the membrane selectivity for Na+. The modification in the cell-wall constituents by silica treatment before the salt stress may have contributed to lower TSCFNa+ which resulted to reduced Na+ and Cl- accumulation in the leaf blade and consequently improved the dry weight increase of plants under stress
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