Rice breeding for saline areas in Mekong Delta [Vietnam]
2001
Buu, B.C. | Bay, N.D. | Tao, P.B. | Truong, D.X. | Lang, N.T. (Cuu Long Delta Rice Research Inst., Omon, Can Tho (Vietnam))
Rice varieties needed to exploit the full potential of the ecosystem must be adapted to many constraints including saline soils. The coastal rainfed lowland rice areas need varieties adapted to water depth of 30-50 m, growth duration 120-140 days or 90-105 days, drought tolerance at seedling stage, and tolerance to salt intrusion before wet season (EC= 4-6 dS/m). Two tolerant varieties CSR10 and CSR13 were used to investigate biochemical changes under saline conditions. Salinity caused a drastic decrease in potassium content of salt-sensitive varieties. Polyamine, putreseine, spermidine, spermine concentration are also reported in terms of osmotic shock and dessication symptoms. A population of 257 segregants from F3 family was developed from a cross between IR28 and Doc Phung. Phenotypes were evaluated by visual score of salt tolerance at vegetative and reproductive stages under saline stress of EC10=dS/m in phytotron. Some mid-duration genotypes were well developed such as IR42, OM723-11, A69-1, OM861, OM922, Tep Hanh mutant, OM1346, OM 1348, and OM 1849. Some early duration genotypes were noticed to be suitable under such conditions as OM1314, OM1490 and OM 2031
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