Abstract
In carrot (Daucus carota L.) somatic embryos, desiccation tolerance is induced by treatment with abscisic acid (ABA). Six cDNA clones that showed ABA-enhanced expression were isolated from carrot by differential screening with ABA-treated and ABA-untreated somatic embryos, and they were named the CAISE (carrot ABA-induced in somatic embryos) genes. Five of the clones encode late embryogenesis abundant (LEA) proteins, and the other clone encodes a glucose and ribitol dehydrogenase. The expression of the CAISE genes was detected in maturing seeds, embryogenic cells, and ABA-treated somatic embryos in which exhibit desiccation tolerance induced by endogenous or exogenous ABA. These results indicate that ABA-induced desiccation tolerance in carrot somatic embryos may be induced by the LEA proteins and the glucose and ribitol dehydrogenase encoded by these ABA-inducible genes.
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