Functional genomics to discover genes for salt tolerance in annual and perennial plants
With the progress in plant genomics, more and more information is being gained about genes that respond to different stresses. Microarray analyses of transcriptome regulation under salt stress have uncovered the complex gene networks involved in mechanisms of sensing, signaling, and short-term response. Most of this knowledge has been derived from shock-stress experiments conducted on one genotype under laboratory conditions, but the long-term acclimation to salt stress has been addressed by only few studies. The genes responsible for the variability of salt tolerance could be valuable resources in breeding programs but they are difficult to identify in typical microarray experiments. The genes revealed by transcriptome analyses of salt-stressed plants are often common to other stresses and other species and do not explain the heritable variation. Comparative genomics is based on the comparison of genotypes differing in pheno-typical behavior and is a promising approach to identify genes that control the heritable genetic variation of salt tolerance.
KeywordsSalt Stress Salt Tolerance Glycine Betaine Rice Genotype Tolerant Genotype
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