Diversity analysis of rice varieties differing in salt tolerance [electronic resource].

Includes references.

Two hundred seventy jive Sequence Tagged Microsatellite (STMS) markers covering the whole rice genome were used to screen polymorphism among eight rice genotypes with different levels and mechanisms of salt tolerance. The set included five salt Iolerant varieties; Pokkali, CSRIO, CSRII, CSR17and IR4630-11-1-5-I-3; one moderately tolerant variety; CSR30 and two international sensitive checks, IR28 and MI¬48 The moderately tolerant, aromatic rice variety CSR30 was the most divergent genotype from the other genotypes (less than 44% similarity) and formed a separate group. The second group consisted of CSR27 and IR4630-22-2-5-3-3 which is also in correspondence with their pedigree since both of them are derived from a common salt tolerant rice genotype, Nona Bokra. The third group included two salt sensitive genotypes MI-48 andIR 28. The fourth group composed of Pokkali, CSR10 and CSRII. The CSRIO and CSRIl were very similar at the molecular level, showing 96.8% similarity. IInd confuming that the molecular assessment is in correspondence with their pedigree. A unique and double banding pattern was observed in Pokkali suggesting a duplication of these segmonts.

Summary in Arabic.

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