Absence of nitrogen fixation (acetylene reduction) by procaryotes in nectar of Banksias

  title={Absence of nitrogen fixation (acetylene reduction) by procaryotes in nectar of Banksias},
  author={Gregory J. Barrett and Byron B. Lamont},
  journal={Plant and Soil},
SummaryAn earlier hypothesis that blue-green algae in the nectar ofBanksia telmatiaea contribute to the nitrogen economy of the host by fixing N2 was tested. Field and laboratory experiments failed to demonstrate C2H4 production in C2H2-treated containers over extended periods. Soil N was not higher at the end of the flowering season and plants in which flower heads were removed prior to nectar production did not contain less N than the controls. 



Reproductive isolation of co-occurring Banksia species at the Yule Brook Botany Reserve, Western Australia

Of the winter-flowering species B. menziesii, in addition to inhabiting a slightly more elevated, drier habitat in the reserve, showed pollen-style incompatibility with both B. littoralis and B. telmatiaea, it is suggested that these two species may be adapted morphologically and physiologically to the attraction of different animal pollinators.

Root hair dimensions and surface/volume/weight ratios of roots with the aid of scanning electron microscopy

SummaryScanning electron micrographs were used to determine dimensions of hairy roots and formulae were derived for estimation of root surface area and volume. The method proved suitable for the

Biology of Acacia pulchella R.br. With Special Reference to Symbiotic Nitrogen Fixation

Growth, reproduction and longevity of the fire weed Acacia pulchella var. glaberrima were examined in natural populations of known age in coastal sands in and around Perth, W.A. Dense populations