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Elucidation of the mechanisms of dehydration tolerance in poplar ( Populus  sp.) trees will permit development of biochemical and molecular indicators to identify dehydration- tolerant genotypes during genetic selection. The objectives of this study were to characterize the degree of phenotypic variation in osmotic potential (a determinant of dehydration tolerance), determine the relationship between osmotic potential at full turgor and relative growth rate, and identify quantitative trait loci (QTL) for osmotic potential in an advanced-generation, interspecific poplar pedigree established in contrasting environments. A three-generation, sib-mated black cottonwood ( Populus trichocarpa  Torr. &amp; Gray) and eastern cottonwood ( P. deltoides  Bartr.) segregating F 2  family (Family 331) was analyzed at a dry site east of the Cascade Mountain Range (Boardman, OR) and at a wet site west of the mountains (Clatskanie, OR). At the Boardman site, 2-year-old trees (59 clones) were either irrigated everyday (wet) or every other day (dry), whereas 3- and 4-year-old trees (58 clones) at the Clatskanie site were unirrigated.

tree physiology

Phenotypic variation and quantitative trait locus identification for osmotic potential in an interspecific hybrid inbred F 2  poplar pedigree grown in contrasting environments