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61.
Michael J. Sullivan 《Journal of phycology》1975,11(4):384-390
Edaphic diatoms were collected from 5 representative habitats of Canary Creek salt marsh, Lewes, Delaware, from 24 July 1969 to 21 July 1970. Of the 104 taxa encountered, 32 had a general distribution on the marsh and 41 were endemic to one of the 5 habitats sampled. Three of the habitats supported stands of grasses: tall Spartina alterniflora Loisel., dwarf S. alterniflora, and Distichlis spicata (L.) Greene; and these habitats possessed the highest species diversity (H') and the greatest number of diatom species. The remaining 2 habitats, a bare bank and a panne, were devoid of macroscopic vegetation. The diatoms of these last 2 habitats were exposed to hypersaline conditions during warmer periods of the year and this was considered a contributing factor to the lower values observed for the aforementioned parameters of community structure. A comprehensive examination of the community structure characterizing the 5 habitats, employing statistical analyses and the distribution of species, showed each habitat to support its own unique and easily recognizable edaphic diatom community. A multiple regression analysis indicated that the differences between the 5 communities were closely related to differences in temperature and elevation between the habitats, and also a result of significant interactions between edaphic diatoms and filamentous algae. 相似文献
62.
The stable integration of GUS and NPTII genes in Mentha arvensis and M. spicata has been achieved by Agrobacterium tumefaciens-mediated
gene transfer. Transformation assays were performed by cocultivating plant leaf disks with either GV2260/GI or EHA105/MOG
Agrobacterium strains. Transgenic plants were selected on medium containing 150 mg l−1 kanamycin. Transgene presence and structure was studied by the use of PCR analysis and Southern blot hybridization. Transgene
expression was evaluated by RT-PCR and transgene product activity by a histoenzymatic GUS assay.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献