Now showing items 11-20 of 64
The role of Potamogeton crispus L. in the Pongolo River floodplain ecosystem.
1. Aquatic macrophytes generally dominate energy and nutrient transfers in wetland ecosystems. They provide a diverse habitat for other organisms but each species or life-form, has a different role in determining ecosystem ...
Hormonal regulation of tuberization of cassava (Manihot esculenta Crantz)
The relative distribution of dry matter over shoot and tuberous roots is an important factor in determining the yield of cassava. Under sub-tropical conditions the dry matter distribution pattern is not always efficient. ...
The biochemical and cytokinin changes in the developing and germinating seeds of Podocarpus henkelli stapf.
A review of the literature revealed that there is a lack of depth in our knowledge of gymnospermous seeds with regard to the development and germination processes. The phytohormones, particularly the cytokinins have ...
On the ecology of hyperscum-forming Microsystis aeruginosa in a hypertrophic African lake.
Light is the primary source of energy in most of earth's ecosystems . In freshwater ecosystems the major interacting factors that determine the abundance and species composition of planktonic phototrophs, the primary ...
Studies of the management of grazing resources on the Makatini Flats and Pongolo River Floodplain.
Subsequent to the impounding of the Pongolo river in the 1970's, development of irrigated agriculture on the Makatini flats has been reducing the area of vegetation available for grazing, and flooding patterns on the ...
The regulation of root development by aluminium in Zea mays L.
This investigation confirmed that plant reaction to Al was directed through the disruption of intercellular co-ordination existing between the cell populations comprising the root meristem. The first detectable response ...
A study of the marine phytoflagellate Pyramimonas pseudoparkeae Pienaar et Aken (Prasinophyceae)
The morphology and structure of P. pseudoparkeae is described in detail. The alga resembles other species in the genus but is most closely related to P. parkeae being separated from it by differences in scale ...
The role of cytokinins in the regulation of apical dominance in Pisum sativum.
Intact or decapitated Pisum sativum seedlings were used to investigate the correlative inhibition of lateral buds by the shoot apex - a developmental process known as apical dominance. Apical dominance is considered to ...
Taxonomic studies in the tribe Justicieae of the family Acanthaceae.
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Tissue culture of selected indigenous monocotyledons.
Components of the South African indigenous flora are disappearing at an alarming rate, due to pressures on land use. The flora is protected by proclamation of reserves and conservation legislation, however these measures ...