Eight-year studies of genotypic and phenotypic variation in temperate tree species in eastern North America in relation to various stress factors (e.g. water, light and nutrients) included the evaluation of such features as gas exchange, tissue water relations and leaf morphology and dealt with...

To produce a tolerant strain of this waterlogging-sensitive species, shoot tips of mature elite trees were cultured on supplemented MS medium, and shoots were further multiplied by subculturing shoot microcuttings differentiated in vitro on fresh medium of the same composition, where 10-15 shoots...

This volume contains abstracts of symposium papers, contributed papers and posters presented at the annual meeting of the Botanical Society of America with the American Institute of Biological Sciences in San Antonio, Texas held during 4-8 August 1991. The subject area covered is divided into 12...

Fossil woods of tropical African genera (Entandrophragma, Khaya, Baphia, Erythrophleum, Tetrapleura) recovered from a Pliocene site are discussed. The phytogeographical and palaeoclimatological significance of these findings are assessed.

A clinal increase in DNA content was observed from south to north over the natural range. Trees from coastal sources had more DNA than those from interior ones. This variation appeared to relate to differences in chromosome width and volume but not length. Regression analysis and...

In experiments with embryo culture of early ripening cultivars from which seedlings cannot be obtained by standard methods of stratification, the best results were obtained by (1) peeling off seed integuments for surface sterilization and to encourage germination and (2) applying a chilling period...

Seedlings of Robinia pseudoacacia, Abies amabilis and A. procera were desiccated over a 7-day period to at least -18 bars, and subsequently the soil was watered to field capacity. There was a completely different pattern of the recovery of plant processes in R. pseudoacacia and the Abies spp. A 10- ...

Reports a study of the interactions between biotic and environmental factors affecting the rate of water loss from conifers in winter. Results are related to the influence of winter conditions on the success of the dominant tree species in the sub-alpine zone of the White Mountains, New Hampshire....

Measurements were made of soil moisture, and of diffusive resistance, water potential and osmotic potential of leaves of Pinus monticola and three woody brush species (Acer glabrum, Alnus sinuata and Physocarpus malvaceus) on N. and S. aspects in the Priest River Experimental Forest, Idaho. Soil...

Growth patterns of developing shoots, collenchyma, cortical parenchyma and pith were studied in L. styraciflua grown under natural, short or long photoperiods with optimum soil water, or under natural photoperiods with water stress. Variation in shoot length was caused more by variation in cell...