Browsing Botany by Title
Now showing items 178-197 of 261
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Recirculating hydroponic systems : evaluating cuttings yield and rooting ability of cold tolerant eucalyptus hybrids.
(2004)In South Africa, clonal forestry of Eucalyptus and its hybrids has been implemented to increase the productivity on existing forestry lands and marginal sites and to facilitate the production of desired fibre types for ... -
Regeneration and biotransformation of some members of the Cucurbitaceae.
(1998)Five cultivars, all belonging to the family Cucurbitaceae, have been tested for the ability to regenerate shoots or somatic embryos from cotyledonary explants. The influence of several combinations of growth regulators ... -
Regeneration failure and the Acacia karroo successional pathway in coastal dune forests in KwaZulu-Natal, South Africa.
(2007)Monospecific stands of Acacia karroo establish naturally on disturbed coastal dunes in KwaZulu-Natal, South Africa. While the A. karroo successional pathway is successful in rehabilitating mined dunes at the Richards Bay ... -
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 ... -
Regulation of hyperhydricity in Aloe polyphylla propagated in vitro.
(2009)Micropropagation of Aloe polyphylla, an endangered species with a high ornamental and medicinal value, is an important part of its conservation. However, the in vitro culture was hindered by the phenomenon of hyperhydricity. ... -
Regulation of nitrate reductase during in vitro differentiation of nicotiana tabacum L. var. samsun.
(1993)The commencement of in vitro differentiation is mediated by genetic changes that result in selective expression of genes and a shift in metabolism. The role of nitrate reductase, a key enzyme of nitrate assimilation, during ... -
The regulation of phytoplankton productivity in a shallow, turbid, oligotrophic lake.
(1988)Aspects of the physical and chemical environment likely to influence phytoplankton productivity were investigated in Lake Midmar, a shallow (mean depth 11.4m), oligotrophic impoundment, over a three year period to ... -
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 regulatory role for proline metabolism in Arabidopsis thaliana (L.) Heynh.
(1998)Many plants accumulate organic osmolytes in response to the imposition of environmental stresses that cause cellular dehydration. Of these, proline is the most extensively studied. Conclusive demonstration that this imino ... -
The reproductive biology, natural enemies and biological control of Delairea odorata Lem.
(2000)Delairea odorata Lem., an asteraceous perennial vine indigenous to southern Africa, has become naturalised and invasive in many subtropical regions including California, South Australia and Hawaii. Biological control ... -
Reproductive potential of Solanum mauritianum Scop. : implications for control.
(1990)Solanum mauritianum Scop. is rated the worst invader species in pine plantations throughout the Republic of South Africa. Control is costly and apparently ineffectual since the species is spreading in pine plantations ... -
Resource quantification, use and sustainable management of coastal forests in the eastern Cape province.
(2002)Indigenous forests of South Africa are few, small in size and highly fragmented, yet they face intense exploitation particularly in the rural areas. Management of these forests is challenging. High rural dependency on ... -
Resprouting and multi-stemming and the role of the persistence niche in the structure and dynamics of subtropical coastal dune forest in KwaZulu-Natal province, South Africa.
(2008)Resprouting is an important means of plant regeneration especially under conditions that do not favour regeneration through seeding such as frequent disturbances, low productivity, unfavourable soil conditions, extreme ... -
A revision of Argyrolobium (Crotalarieae, Fabaceae) in South Africa.
(1994)A revision of 45 South African species of Argyrolobium is presented comprising nomenclature, typification, recorded distributions and full descriptions. In an attempt to reduce confusion between subtly different species, ... -
A revision of the genus Ledebouria Roth (Hyacinthaceae) in South Africa.
(1993)Members of the genus Ledebouria Roth (Hyacinthaceae), which occur in South Africa, are revised. This genus occurs throughout Africa, India and Madagascar. 33 Species are recognized and placed into nine provisional infrageneric ... -
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 ... -
The role of cytokinins in the regulation of apical dominance in Pisum sativum.
(1988)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 ... -
The role of fire and fire-related factors on germination and growth of grassland species.
(2010)Fire, natural or of anthropologic origin is a recurrent phenomenon in South African mesic grasslands. The species composition of these grasslands is sensitive to fire frequency and there exists a permanent fire-species ... -
The role of fire in bush encroachment in Ithala Game Reserve.
(2010)The increase of woody vegetation (also known as bush or shrub encroachment) in savannas has become of global concern to conservationists and rangeland managers alike. Bush encroachment has been associated with a decrease ... -
Role of light and temperature in the flowering of Watsonia species.
(2006)The role of light and temperature on flowering of South African Watsonia species were evaluated to assess the potential for this genus as a commercial flower crop. Species were selected that represent different climatic ...