Browsing Botany by Title
Now showing items 236-255 of 261
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A taxonomic reassessment of the subtribe Asciepiadinae (Asclepiadaceae) in Southern Africa : Vol. 2.
(1999)This study extends an earlier M.Sc. research project on the narrow-leaved species of the genus Asclepias L. (30 species) to cover the entire subtribe Asclepiadinae sensu K. Schum. in southern Africa- (182 species in 23 ... -
A taxonomic revision of the tribe Desmodieae (Leguminosae - Papilionoideae)
(1984)The tribe Desmodieae has a pantropical distribution and is one of the most advanced tribes in the subfamily Papilionoideae. Despite this fact, the tribe was already present in the fossil record of the early Tertiary and ... -
Taxonomic studies in the tribe Justicieae of the family Acanthaceae.
(1985)Unable to copy from pdf. -
The effect of developmental status and excision injury on the success of cryopreservation of germplasm from non-orthodox seeds.
(2007)The zygotic germplasm of plant species producing desiccation-sensitive seeds can be conserved in the long-term only by cryopreservation. Usually the embryonic axis is excised from the cotyledons and is used as the explant ... -
Tissue culture of selected indigenous monocotyledons.
(1988)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 ... -
Tissue culture studies on citrus and Welwitschia.
(1972)Part I. IN VITRO CULTURE OF CITRUS EMBRYOS AND NUCELLAR ISOLATES Zygotic embryos of the Ellendale mandarin, a monoembryonic variety of citrus, were cultured on modified basal media of Murashige and Skoog (BM[1]), and ... -
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 ... -
Towards ameliorating some of the stresses associated with the procedural steps involved in the cryopreservation of recalcitrant-seeded germplasm.
(2017)Abstract available in PDF file. -
Towards developing effective decontamination procedures for in vitro culture of embryonic axes excised from recalcitrant seeds.
(2013)Control of seed-associated micro-organisms is vital in reducing losses of plants of economic importance. Recalcitrant seeds being metabolically active and able to be stored only under conditions of high relative humidity ... -
Towards development of a cryopreservation protocol for germplasm of Podocarpus henkelii.
(2012)The trees belonging to the genus Podocarpus, of which only four species are native to South Africa, are renowned for their superior quality timber. Prior to 1880, Podocarpus henkelii, together with P. falcatus and P. ... -
Towards marker assisted selection for nematode resistance in soybean.
(2000)Meloidogyne javanica is the most widely spread nematode pest on soybean in South Africa. Only a few registered cultivars have some resistance to this nematode and there is an urgent need for an efficient breeding programme ... -
Transformation of potatoes with the potato leafroll virus coat protein gene.
(1995)Potato leafroll virus (PLRV) is one of the most destructive potato viruses in South Africa. In order to establish resistance against PLRV in commercial potato cultivars, the coat protein (CP) gene of the virus was ... -
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 ... -
Ultrastructure of the germinating Welwitschia mirabilis seed.
(1975)The structure and chemical composition of quiescent Welwitschia mirabilis (Hooker fil.) seeds and resultant changes occurring during the first 7 days of germination were studied. Research was focussed on the megagametophyte ... -
Uptake of Cadmium and its effect on the physiology of the liverwort Dumortiera hirsuta (SW) Nees and the moss Atrichum androgynum (CM) Jaeg.
(1997)In this thesis, the uptake kinetics of Cd by the liverwort D. hirsuta and the moss A. androgynum were investigated. In preliminary experiments, the toxicity of Cd to the bryophytes was investigated by characterising the ... -
The use of a virtual world to address misconceptions held by students regarding photosynthesis and respiration.
(1998)In an effort to contribute to the improvement of Matric Biology education, a survey was conducted in 1996 and 1997 of Matric pupils and first year students at several tertiary institutions, in order to identify those topics ...