Soils that contain toxic amounts of minerals or are deficient in essential plant nutrients are widespread globally and seriously constrain rice production. New methods are necessary to incorporate the complex adaptive traits associated with tolerance of these abiotic stresses, while simultaneously retaining the high yield potential of rice varieties when conditions are favorable. Significant progress in the genetic characterization of stress response pathways and recent advances in genomics have provided powerful tools for in-depth dissection of tolerance mechanisms. Additionally, tolerance of most of these abiotic stresses in rice is controlled by a few QTLs with large effects despite the intricacy of the numerous traits involved. Genetic dissection of these QTLs and their incorporation into high-yielding varieties will significantly enhance and stabilize rice productivity in these problem soils. Current efforts at IRRI and in rice breeding programs worldwide are seeking to explore diverse germplasm collections and genetically dissect the causal mechanisms of tolerance to facilitate their use in breeding. This review focuses on salinity and P and Zn deficiency as the major problems encountered in rice soils, and examines current understanding of the mechanisms involved and efforts toward germplasm improvement.
Plant Molecular Biology – Springer Journals
Published: Aug 17, 2007
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