Ultrastructure of pollen exine in centrospermous families |
| |
Authors: | John J. Skvarla Joan W. Nowicke |
| |
Affiliation: | (1) Department of Botany and Microbiology, University of Oklahoma, 770 Van Vleet Oval, 73069 Norman, Oklahoma, USA;(2) Department of Botany, Smithsonian Institution, 20560 Washington, D.C., USA |
| |
Abstract: | Transmission electron microscopy was utilized to examine pollen walls of selected taxa in theAizoaceae, Amaranthaceae, Basellaceae, Cactaceae, Chenopodiaceae, Didiereaceae, Halophytaceae, Nyctaginaceae, Phytolaccaceae, Portulacaceae, andCaryophyllaceae. This conspectus is an adjunct to scanning electron microscope observations of pollen surfaces and is directed towards elucidating the basic wall structure for these families. Although differences in internal morphology were observed at the inter- and intra-familial levels, they were interpreted as reflecting variations rather than major differences. The data indicate close morphological similarities of the first ten families enumerated above, i.e., those containing betalains. TheCaryophyllaceae, an anthocyanin family, indicated a slightly greater heterogeneity of pollen ultrastructure but not to the extent of disassociating it from the betalain families. In fact, this heterogeneity was rivaled by comparable heterogeneity among and within some of the betalain families. The conclusion is that all families have close pollen morphological relationships.Presented in the Symposium Evolution of Centrospermous Families, during the XIIth International Botanical Congress, Leningrad, July 8, 1975. |
| |
Keywords: | Angiospermae Centrospermae Pollen comparative ultrastructure of exine |
本文献已被 SpringerLink 等数据库收录! |
|