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Introgression of target genes from wild rices to cultivars to improve biotic and abiotic stress tolerance
Thursday, 2013/06/06 | 11:27:53

Introgression of   target genes from wild rices to cultivars to improve biotic and abiotic stress tolerance

 

Bui chi Buu1 and Nguyen thi Lang2

1 Institute of Agricultural Sciences for Southern Vietnam

2 Cuu Long Delta Rice Research Institute

 

ABSTRACT

 

More than 5,000 accessions of traditional rices and 160 populations of four wild rices species (Oryza rufipogon, O. nivara, O. officinalis, O. granulata) were collected and preserved at the VAAS gene bank in Vietnam. Wild species of Oryza are an important of useful genes for resistance to major diseases and insects, tolerance for abiotic stresses, and a new source of cytoplasmic male sterility (CMS). A series of interspecific hybrids between rice and various wild species, monosomic alien addition lines (MAAL) and introgression line (2n=24) have been produced. Oryza ruffipogon (2n=24 =AA) is  widely distributed in tropical and subtropical areas in Vietnam. A derivative from O. rufipogon and cultivar (IR64) has been successfully exploited to develop acid sulfate soil tolerance genotype (namely AS996). It became a donor for salt tolerance, heat tolerance, P deficiency tolerance and brown plant hopper resistance at CLRRI rice breeding program. Seven polymorphic microsatellite markers were applied (four markers linked to Fe toxicity tolerance as: RM252, RM211, RM315, RM212 and three linked to Al toxicity tolerance as RM223, RM215, OSR29. In addition, two microsatellites linked to P deficiency tolerance were reported as R3375 and RM367 on chromosome 12.  Genotyping blast resistance among wild rice populations  via molecular 38 polymorphic markers (SSRs) indicated that O. punctata , O. latifolia-1, O. nivara were categorized into the same genetic cluster of Te Tep (donor for durable resistance). A derivative from Oryza nivara was successfully developed to be blast resistance genotype. Advanced mapping population derived from Oryza officinalis, as a donor and through bulked segregant and linkage analyses, Bph-10 was detected  within 4.6 cM region containing 11 microsatellites and RFLPs in chromosome 12. BPH resistance genes were also detected in Oryza rufipogon populations collected in Bird Sanctuary in Mekong Delta.

 

Reported in the International Symposium on Agribiodiversity for Sustainable Development

June 2-3, 2013; Beijing, China

 

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