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Browsing by Subject "Plant sciences"

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Asteraceae - an evaluation of hutchinsons beetle-daisy hypothesis

Author: Midgley, JJ Date: May 1993 There are cape Asteraceae species that have conspicuous dark markings on their ray florets. Such markings are usually interpreted as guides of various sorts. It is thus suggested that the dark raised marks on the ray florets of Gorteria diffusa ... Read more
Bean polygalacturonase inhibitor protein-1 (PGIP-1) inhibits polygalacturonases from Stenocarpella maydis

Author: Berger, DK ; Oelofse, D ; Arendse, MS ; Du Plessis, E ; Dubery, IA Date: Jul 2000 Stenocarpella maydis, a fungal pathogen of maize, produced polygalacturonases (PGs) when grown on pectin or maize cell walls. An extract from bean (Phaseolus vulgaris L.) which contained an active inhibitor of Aspergillus niger PG, also ... Read more
Composition and biogeography of forest patches on the inland mountains of the southern Cape

Author: Geldenhuys, CJ Date: May 1997 Patterns in species richness of 23 small, isolated forests on the inland mountains of the southern Cape were studied. Species richness of woody plants and vines of the Kouga-Baviaanskloof Forests was higher than in the western mountain ... Read more
Demand, propagation and seedling establishment of selected medicinal trees

Author: Netshiluvhi, TR Date: Dec 1999 Short-listing of medicinal tree species for propagation was done through three criteria; number of bags sold, price per bag and mean scarcity value. There is a strong correlation between the mean scarcity values and number of bags sold per ... Read more
Efficient in vitro plant regeneration from immature zygotic embryos of pearl millet [Pennisetum glaucum (L.) R. Br.] and Sorghum bicolor (L.) Moench

Author: Oldach, KH ; Morgenstern, A ; Rother, S ; Girgi, M ; O'Kennedy, Maretha M ; Lorz, H Date: Jul 2001 The authors report an in vitro culture system that provides reliable, highly efficient regeneration from immature embryos of pearl millet [Pennisetum glaucum (L.) R. Br.] and sorghum [Sorghum bicolor (L.) Moench]. Immature embryos were isolated ... Read more
Floristic composition of the southern cape forests with an annotated checklist

Author: Geldenhuys, CJ Date: Feb 1993 An annotated list of species recorded in the forests of the southern Cape is provided. The flora comprises 470 species which belong to 280 genera and 106 families (50 monogeneric families, 32 monospecific families and 193 monospecific genera). ... Read more
In vitro antiplasmodial activity of medicinal plants native to or naturalised in South Africa

Author: Clarkson, C ; Maharaj, VJ ; Crouch, NR ; Grace, WM ; Pillay, P ; Matsabisa, MG ; Bhagwandin, N ; Smith, PJ ; Folb, PI Date: Jun 2004 The increasing prevalence and distribution of malaria has been attributed to a number of factors, one of them being the emergence and spread of drug resistant parasites. Efforts are now being directed towards the discovery and development of ... Read more
Pearl millet transformation system using the positive selectable marker gene phosphomannose isomerase

Author: O'Kennedy, Maretha M ; Burger, JT ; Botha, FC Date: Apr 2004 Fertile transgenic pearl millet plants expressing a phosphomannose isomerase (PMI) transgene under control of the maize ubiquitin constitutive promoter were obtained using the transformation system described here. Proliferating immature zygotic ... Read more
Plant-derived pharmaceuticals - the road forward

Author: Ma, JKC ; Chikwamba, Rachel K ; Sparrow, P ; Fischer, R ; Mahoney, R ; Twyman, RM Date: Dec 2005 Plant-derived pharmaceuticals are poised to become the next major commercial development in biotechnology. The advantages they offer in terms of production scale and economy, product safety, ease of storage and distribution cannot be matched ... Read more
Predicting invasive species impacts on hydrological processes: the consequences of plant physiology for landscape processes

Author: Le Maitre, David C Date: 2004 The adverse impacts of invading alien organisms are widely recognized as one of the major threats to biodiversity and are receiving growing recognition as a major socioeconomic threat. The hydrological impacts of alien plants have received ... Read more
Seasonal variations in the vertical distribution of benthic microalgae in the upper sediment of the Mdloti Estuary, South Africa

Author: Mundree, S ; Perissinotto, R ; Nozais, C Date: 2003 A 12-month survey investigated seasonal variations in the vertical distribution of benthic microalgal biomass in relation to major factors potentially controlling their dynamics in the subtropical temporarily open Mdloti Estuary, KwaZulu ... Read more
Stimulatory effects of acibenzolar-s-methyl on chlorogenic acids biosynthesis in Centella asiatica cells

Author: Ncube, EN ; Steenkamp, Paul A ; Madala, NE ; Dubery, IA Date: Sep 2016 Centella asiatica is a perrenial herb that grows in tropical regions with numerous medicinal properties mostly attributed to the presence of pentacyclic triterpenoids. Interestingly, this plant also possess a significant amount of ... Read more
Survival of eight woody sprouting species following an autumn fire in Swartboskloof, Cape Province, South-Africa

Author: Le Maitre, David C ; Jones, CA ; Forsyth, GG Date: Dec 1992 The survival of Widdringtonia nodiflora (L.) Powrie, Aulax pallasia Stapf, Mimetes cucullatus (L.) R.Br., Leucadendron salignum Berg., Brunia nodiflora L., Nebelia paleacea (Berg.) Sweet, Penaea mucronata L. and Erica coccinea L. was monitored ... Read more
Transformation of elite white maize using the particle inflow gun and detailed analysis of a low-copy integration event

Author: O'Kennedy, Maretha M ; Burger, JT ; Berger, DK Date: Dec 2001 Elite white maize lines W506 and M37W were transformed with a selectable marker gene (bar) and a reporter gene (uidA) or the polygalacturonase-inhibiting protein (pgip) gene after bombardment of cultured immature zygotic embryos using the ... Read more
Transgenic and herbicide resistant pearl millet (Pennisetum glaucum L.) R.Br. via microprojectile bombardment of scutellar tissue

Author: Girgi, M ; O'Kennedy, Maretha M ; Morgenstern, A ; Mayer, G ; Lorz, H ; Oldach, KH Date: 2002 Four different pearl millet breeding lines were transformed and led to the regeneration of fertile transgenic plants. Scutellar tissue was bombarded with two plasmids containing the bar selectable marker and the beta-glucuronidase reporter ... Read more
Trends in savanna structure and composition along an aridity gradient in the Kalahari

Author: Scholes, RJ ; Dowty, PR ; Caylor, K ; Parsons, DAB ; Frost, PGH ; Shugart, HH Date: Jun 2002 The Kalahari sand sheet occupies 2.5 million ha in southern Africa. It is an area with relatively similar deep Aeolian soils, and a strong south to north gradient in rainfall, from 200 to 1000 mm mean annual precipitation (MAP) in the region ... Read more

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