Browsing Botany by Title
Now showing items 222-241 of 261
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Studies of transgenic tobacco plants containing Escherichia Coli glutathione reductase.
(1996)Glutathione reductase (GR) and superoxide dismutase (SOD) enzymes are thought to play an important role in the plant chloroplast antioxidant system. Tobacco plants transformed with E. coli glutathione reductase and ... -
Studies on factors influencing viability after cryopreservation of excised zygotic embryos from recalcitrant seeds of two amaryllid species.
(2010)Recalcitrant unlike orthodox seeds do not show a sharp border between maturation and germination and remain highly hydrated and desiccation-sensitive at all developmental and post-harvest stages. In contrast with ... -
Studies on the genetic engineering of herbicide resistance into South African tobacco cultivars.
(1994)Tobacco is an important crop in South Africa. The genetic basis of tobacco breeding is very narrow and cultivars are closely related. The production of new tobacco hybrids with novel characteristics through classical ... -
Studies on the primary phloem of Gomphocarpus physocarpus.
(1974)Penetration of the stems and leaves of Gomphocnrpus physocarpus by the aphid, Aphis nerii was studied with light and phase microscopes. Penetration of the epidermis and ground tissue was largely intercellular, that ... -
A study of some chilling responses of recalcitrant seeds of Avicennia marina (Forssk.) Vierh. and Ekebergia capensis Sparrm.
(2002)Seeds remain the most convenient and successful way for storing the genetic diversity of plant species and for producing new plants routinely for agriculture and horticulture. The importance of seed storage and the ability ... -
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 ... -
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 ... -
Survival and rooting of selected vegetatively propagated Eucalyptus clones in relation to supplied auxin.
(2013)Eucalyptus spp. and hybrids dominate the global plantation forestry industry, and vegetative propagation through cuttings is the preferred method for their commercial use. However, the cuttings of some species and hybrids ... -
A synfloristic comparison of Oribi Gorge and Umtamvuna Nature Reserves.
(1998)Climatic oscillation during the Quaternary resulted in fragmentation of once more continuous ancient floras and a series of invasions of different floras into the Pondoland Centre in response to climatic change, with ... -
Systematic studies in African Indigofereae (Leguminosae, Papilionoideae)
(1991)A cladistic analysis of 51 generic and infrageneric taxa in the tribe Indiqofereae (Papilionoideae) is presented, comprising q 570 species in Africa and Madagascar. Traditionally, 4 genera have been recognized: Phylloxylon ... -
Systematic studies in Gnidia L. (Thymelaeaceae)
(2010)Gnidia L., variously estimated to contain 100–160 species, is the largest genus in the sub-cosmopolitan family Thymelaeaceae. Most species are shrubby, and occur in tropical and southern Africa, with one species reaching ... -
A systematic study of Leonotis (Pers.) R. Br. (Lamiaceae) in southern Africa.
(1995)The southern African species of Leonotis (Pers.) R. Br. are revised. Nine taxa are recognised including a new species and two new subspecies. A multidisciplinary approach was adopted involving: floral, vegetative, seedling ... -
Systematics of Bonatea (Orchidaceae) : species boundaries and phylogeny.
(2006)Bonatea Willd. (Orchidaceae: Habernariinae) is a small genus confined to the African continent and Arabia. Phylogenetic and morphometric analyses were undertaken in order to evaluate phylogenetic relationships and species ... -
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 ...