026 MICROPROPAGATION OF BUTTERNUT, JUGLANS CINEREA

Regional patterns of declining butternut (Juglans cinerea L.) suggest site characteristics for restoration

Butternut trees dying from a canker disease were first reported in southwestern Wisconsin in 1967. Since then, the disease has caused extensive mortality of butternut throughout its North American range. The objectives of this study were to quantify changes in butternut populations and density across its range and identify habitat characteristics of sites where butternut is surviving in order t...

Dendrochronology of two butternut (Juglans cinerea) populations in the southeastern United States

Butternut (Juglans cinerea) has been an important component of eastern hardwood forests in North America since the last ice-age, but an exotic fungal pathogen (Sirococcus clavigignenti-juglandacearum) has been devastating the species throughout its native range since the late 1960s. Restoration strategies have not been widely adopted in the southern part of the species’ range, in part due to la...

Improving disease resistance of butternut (Juglans cinerea), a threatened fine hardwood: a case for single-tree selection through genetic improvement and deployment.

Approaches for the development of disease-resistant butternut (Juglans cinerea L.) are reviewed. Butternut is a threatened fine hardwood throughout its natural range in eastern North America because of the invasion of the exotic fungus, Sirococcus clavigignenti-juglandacearum Nair, Kostichka and Kuntz, which causes butternut canker. Early efforts were made to identify and collect putatively res...

Progress in Juglans cinerea Conservation: Genetic Diversity, Health, and Introgression

Somatic embryogenesis, micropropagation and plant regeneration of "Early Mature" walnut trees (Juglans regia) that flower in vitro.

Some walnut trees (Juglans regia L.) originating from central Asia display an early flowering phenotype. These "Early Mature" (EM) trees may produce flowers within months of germination. Secondary flowering waves are also observed within a growing season. Inflorescences may carry male, female and hermaphrodite flowers. Progeny obtained from selected EM trees were cultured in vitro to initiate c...