Theodore F. Niehaus's A Field Guide to Southwestern and Texas Wildflowers PDF
By Theodore F. Niehaus
Этот справочник охватывает 1505 видов дикорастущих цветов, группируя их по окраске и внешнему виду для облегчения сопоставления растений и их изображений. Книга содержит более 1500 иллюстраций.
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Extra resources for A Field Guide to Southwestern and Texas Wildflowers
In contrast IMSHENETSKII (332) regards Clostridiwn pasteurianwn as the prototype diazotroph and feels that the numerous similarities between Azotobacter and certain blue-green algae indicate a much more direct evolutionary link between these organisms. Evidence to support the evolutionary chronology outlined in this section is perforce circumstantial, but an examination of some characteristics of the N 2-fixing organisms shows a degree of consistency with the scheme described. The majority of N 2-fixing species are facultative, indicating they were present during the transition from a reducing to an oxidizing environment when the major development and proliferation of the ability to fix N2 are suggested to have occurred.
These bacteria appear to be involved in the hormonal, as well as nitrogen, metabolism of the plant (620). Nodulated leaves were recently found unable to reduce C2H2 to C2H4 (619), possibly because photosynthetically generated O2 inhibited nitrogenase activity; this pOint could be tested by conducting analyses in the dark. Leaf nodule symbioses have been indicated for other plants, particularly Pavetta and Ardisia, but the evidence for N2 fixation in these associations remains equivocal (313) • The blue-green algae are known to form associations of varying complexity with representatives of virtually all other plant forms.
As with the photosynthetic bacteria, vigorous N2 fixation by blue-green algae requires light, though low activity may be observed with some species growing heterotrophically in the dark (223, 687). The long-held belief that N2 fixation is restricted to filamentous species bearing specialized cells called heterocysts, is no longer tenable, though it is clear that these species are dominant among the accredited blue-green algal diazotrophs. Heterocysts are enlarged, thick-walled cells which appear at intervals of 10 to 15 cells in certain filamentous species, and their presence is correlated with the nitrogen nutrition of the organism (516, 684).
A Field Guide to Southwestern and Texas Wildflowers by Theodore F. Niehaus