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Desiccation damage in ornamental plant species is of particular concern to the nursery and landscape industry. Species in two genera,  Acer  and  Alnus , display fundamental differences in how drought affects leaves. The same soil moisture content that causes foliar desiccation and abscission in  Alnus maritima  (Marsh.) Nutt. (seaside alder) causes neither response in  Acer rubrum  L. (red maple). Understanding molecular mechanisms associated with plant response to drought stress can be an im portant factor in developing strategies for improved sustainability in urban landscapes. Our objective was to characterize expression of drought-induced dehydrin genes in leaves of `Red Sunset' red maple (desiccation-resistant) and seaside alder (desiccation-sensitive) in response to dehydration and rehydration. Potted cuttings grown in a glasshouse were subjected to four cycles of drought and rehydration. Stomatal conductance and volumetric moisture content of rooting medium were used to determine when drought cycles ended. During the second and fourth cycles, leaves were sampled for RNA and protein extraction. Dehydrin probes were generated from genomic DNA of both species by using PCR with primers designed from conserved regions in dehydrin genes. Southern blot analyses revealed the presence of dehydrin genes in seaside alder and red maple genomes. Reverse transcriptase (RT)-PCR was used to isolate desiccation-induced dehydrin cDNAs from total RNA extracted from drought-stressed leaves. The cDNA clones show 61% to 66% identity at the nucleic acid level with dehydrin genes of soybean, sunflower, radish, and potato. Accumulation of dehydrin transcripts and proteins in leaves in response to dehydration and rehydration are being studied through northern and western blot analyses, respectively. Our results may lead to a rapid screening technique for seedlings with improved mechanisms of drought resistance.

041 Dehydrins as Drought-stress Mechanisms in Leaves of Red Maple and Seaside Alder