Browsing Doctoral Degrees (Botany) by Issue Date
Now showing items 1-20 of 131
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Automatic classification and ecological profiles of South-Western Transvaal Highveld grassland.
(1973)Abstract available in PDF file. -
The biochemical and cytokinin changes in the developing and germinating seeds of Podocarpus henkelli stapf.
(1982)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 ... -
Transport and metabolism of 8(14C)t-Zeatin.
(1982)A review of the literature established that there were areas of cytokinin transport which needed further investigation, in order to determine the function and/or mode of action of cytokinins during certain stages of plant ... -
Physiological aspects of shoot growth regulation in juvenile and adult Citrus sinensis (L.) Osbeck.
(1982)As the requirements for more efficient and economical crop production emerge, so the need for a better understanding of plant growth and development is felt. It is especially the need to understand means by which man may ... -
Dormancy and germination of the Manketti nut, Ricinodendron rautanenii.
(1982)The distribution of Ricinodendron rautanenii trees is confined to a fairly distinct band across southern Africa. This stretches from South West Africa in the west, through Botswana and Zimbabwe, to Mozambique in the ... -
Tissue culture studies on Peperomia clusifolia Hook. and Strongylodon macrobotrys A. Gray.
(1982)Tissue culture studies were carried out on two ornamental plant species, Strongylodon macrobotrys A. Gray and Peperomia clusifolia Hook. Successful in vitro regeneration of plantlets was achieved in the latter species, using ... -
The plant ecology of seasonally flooded areas of the Pongolo River Floodplain, with particular reference to Cynodon dactylon (L.) Pers.
(1982)The impounding of the waters of the Pongolo river, upstream of its floodplain on the Mocambique coastal plain, may adversely affect the functioning of the floodplain system. A multidisciplinary study of the functioning ... -
A revision of the genus Scleria Bergius (Cyperaceae) in Southern Africa.
(1983)The genus Scleria Bergius (Cyperaceae) in Southern Africa is critically examined, and the generic limits reviewed The taxonomic position of the genus in the family is examined. Diagnosis of the tribe Sclerieae is altered ... -
Cytokinins in Ecklonia maxima and the effect of seaweed concentrate on plant growth.
(1984)The endogenous cytokinin levels in the brown alga Ecklonia maxima (OSBECK) PAPENF., and the effect of applications of the seaweed concentrate (Kelpak 66) prepared from this alga, on the growth and yield of various ... -
The regeneration of Hypoxis rooperi S. Moore and production of hypoxoside in vitro.
(1984)Against the background of the increasing pharmaceutical importance of members of the genus Hypoxis L., methods for propagating these plants and for producing hypoxoside (the believed active compound found within Hypoxis ... -
The role of Potamogeton crispus L. in the Pongolo River floodplain ecosystem.
(1984)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)
(1984)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. ... -
A study of the interrelationships of some Natal species of Senecio (Asteraceae/Compositae)
(1984)This dissertation presents the results of studies of the generic concept of Senecio and the subsequent testing of the hypothes is: that many of the species of Senecio in Natal are congeneric with Senecio L. sensu stricto. ... -
A study of the marine phytoflagellate Pyramimonas pseudoparkeae Pienaar et Aken (Prasinophyceae)
(1985)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 ... -
Taxonomic studies in the tribe Justicieae of the family Acanthaceae.
(1985)Unable to copy from pdf. -
Achene biology and the chemical control of Chromolaena odorata.
(1985)Abstract viewable in PDF document. -
The regulation of root development by aluminium in Zea mays L.
(1986)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 genera Justicia L. and Siphonoglossa oerst. (Acanthaceae) in southern Africa
(1987)A comprehensive revision of the genus Justicia L and, the closely related genera Siphonoglossa Oersted and Aulojusticia Lindau in southern Africa was undertaken as part of the Flora of Southern Africa project. Taxonomic ...