Publications
| a comparison of internal standards for plant cytophotometry. | plant cell nuclei were compared with chicken erythrocyte nuclei for use as internal standards for microspectrophotometry. the amount of dna per nucleus and the coefficient of variation for measurement of individual nuclei were determined for cells from dormant embryos of pinus taeda and pinus coulteri, from onion root tips and from chicken erythrocytes. the chicken erythrocytes had the least variability and thus were best suited for use as a standard. onion root tips were least suitable, with a ... | 1986 | 3787672 |
| reticulate evolution and incomplete lineage sorting among the ponderosa pines. | interspecific gene flow via hybridization may play a major role in evolution by creating reticulate rather than hierarchical lineages in plant species. occasional diploid pine hybrids indicate the potential for introgression, but reticulation is hard to detect because ancestral polymorphism is still shared across many groups of pine species. nucleotide sequences for 53 accessions from 17 species in subsection ponderosae (pinus) provide evidence for reticulate evolution. two discordant patterns a ... | 2009 | 19249377 |