Burnett, Wendy (Dr)

Dr Wendy Burnett

Contact Details

 

Building: John Bews Block C

Office no: 108

Telephone: 033 260 5135

Fax: 033 260 5897

e-mail: stirk@ukzn.ac.za

 

Research Interests

I am a Research Associate in the Research Centre for Plant Growth and Development.

I am primarily a Phycologist working on both microalgae and macroalgae (seaweeds). I have quantified various groups of plant hormones in these algae and am interested in the role that they play in the life cycle, growth and development of algae. This has many applied applications with my research including the use on liquid seaweed extracts as natural biostimulants in agriculture and improving mass cultivation of microalgae for the production of biodiesel. My research also includes improving the biomass production of selected microalgal strains with high lipid content for biodiesel production.

I am also interested in the role of plant hormones in seed germination and uptake of heavy metals by plants, especially medicinal plants which can pose a health risk to consumers.

Publications

Publications list

Last updated : October 2012

Kulkarni MG, Stirk WA, Southway C, Papenfus HB, Swart PA, Lux A, Vaculík M, Martinka M & van Staden J (2013) Plant growth regulators enhance gold uptake in Brassica juncea. International Journal of Phytoremediation 15: 117-126

Ördög V, Stirk WA, Bálint P, van Staden J & Lovász C (2012) Changes in lipid, protein and pigment concentrations in nitrogen-stressed Chlorella minutissima cultures. Journal of Applied Phycology 24: 907-914

Papenfus HB, Stirk WA, Finnie JF & van Staden J (2012) Seasonal variation in the polyamines of Ecklonia maxima. Botanica Marina 55: 539-546

Stirk WA, Novák O, Žižková E, Motyka V, Strnad M & van Staden J (2012) Comparison of endogenous cytokinins and cytokinin oxidase/dehydrogenase activity in germinating and thermoinhibited Tagetes minuta achenes. Journal of Plant Physiology 169: 696-703

Stirk WA, Václaviková K, Novák O, Gajdošová S, Kotland O, Motyka V, Strnad M & van Staden J (2012) Involvement of cis-zeatin, dihydrozeatin and aromatic cytokinins in germination and seedling establishment of maize, oats and lucerne. Journal of Plant Growth Regulation 31: 392-405

Lux A, Vaculík M, Martinka M, Lišková D, Kulkarni MG, Stirk WA & van Staden J (2011) Cadmium induces hypodermal periderm formation in the roots of the monocotyledonous medicinal plant Merwilla plumbea. Annals of Botany 107: 285-292

Stirk WA, van Staden J, Novák O, Doležal K, Strnad M, Dobrev P, Sipos G, Ördög V & Bálint P (2011) Changes in endogenous cytokinin concentrations in Chlorella in relation to light and the cell cycle. Journal of Phycology 47: 291-301

Stirk WA & van Staden J (2010) Flow of cytokinins through the environment. Plant Growth Regulation 62:101-116

Street RA, Kulkarni MG, Stirk WA, Southway C & van Staden J (2010) Effect of cadmium on growth and micronutrient distribution in wild garlic (Tulbaghia violaceae). South African Journal of Botany 76: 332-336

Yokoya NS, Stirk WA, van Staden J, Novák O, Turecková V, Pencík A & Strnad M (2010) Endogenous cytokinins, auxins and abscisic acid in red seaweeds from Brazil. Journal of Phycology 46: 1198-1205

Bairu MW, Jain N, Stirk WA, Doležal K & van Staden J (2009) Solving the problem of shoot tip necrosis in Harpogophytum procumbens by changing the cytokinin types, calcium and boron concentrations in the medium. South African Journal of Botany 75: 122-127

Bairu MW, Stirk WA & van Staden J (2009) Factors contributing to in vitro shoot-tip necrosis and their physiological interactions. Plant Cell, Tissue and Organ Culture 98: 239-248

Dorchin N, Hofmann JH, Stirk WA, Novák O, Strnad M & van Staden J (2009) Sexually dimorphic gall structures correspond to differential phytohormone contents in male and female wasp larvae. Physiological Entomology 34: 359-369

Jain N, Bairu MW, Stirk WA & van Staden J (2009) The effect of medium, carbon source and explant on regeneration and control of shoot tip necrosis in Harpagophytum procumbens. South African Journal of Botany 75: 117-1

Stirk WA, Novák O, Hradecká V, Pencík A, Rolcík J, Strnad M & van Staden J (2009) Endogenous cytokinins, auxins and abscisic acid in Ulva fasciata (Chlorophyta) and Dictyota humifusa (Phaeophyta): towards understanding their biosynthesis and homeostasis. European Journal of Phycology, 44: 231-240

Street RA, Elgorashi EE, Kulkarni MG, Stirk WA, Southway C & van Staden J (2009) Effect of cadmium accumulation on anti-inflammatory activity of two Eucomis species. Bulletin of Environmental Contamination and Toxicology 83: 644-647

Street RA, Kulkarni MG, Stirk WA, Southway C, Abdillahi H, Chinsamy M & van Staden J (2009) Effect of cadmium uptake and accumulation on growth and antibacterial activity of Merwilla plumbea – an extensively used medicinal plant in South Africa. South African Journal of Botany 75: 611-616

Bairu MW, Stirk WA, Doležal K & van Staden J (2008) The role of topolins in micropropagation and somaclonal variation of banana cultivars “Williams” and “Grand Naine” (Musa spp. AAA). Plant Cell, Tissue and Organ Culture 95: 373-379

Jain N, Stirk WA & van Staden J (2008) Cytokinin- and auxin-like activity of a butenolide isolated from plant-derived smoke. South African Journal of Botany 74: 327-331

Stirk WA, Novák O, Václavíková K, Tarkowski P, Strnad M & van Staden J (2008) Spatial and temporal changes in endogenous cytokinins in developing pea roots. Planta 227: 1279-1289

Street RA, Kulkarni MG, Stirk WA, Southway C & van Staden J (2008) Variation in heavy metals and microelements in South African medicinal plants obtained from street markets. Food Additives and Contaminants 25: 953-960

Street RA, Stirk WA & van Staden J (2008) South African traditional medicinal plant trade – Challenges in regulating quality, safety and efficacy. Journal of Ethnopharmacology 119: 705-710

Arthur GD, Stirk WA, Novák O, Hekera P & van Staden J (2007) Occurrence of nutrients and plant hormones (cytokinins and auxins) in the water fern Salvinia molesta during growth and composting. Environmental and Experimental Botany 61: 137-144

Bairu MW, Stirk WA, Doležal K & van Staden J (2007) Optimizing the micropropagation protocol for the endangered Aloe polyphylla: Can meta-topolin and its derivatives serve as replacement for benzyladenine and zeatin? Plant Cell, Tissue and Organ Culture 90: 15-23

Stirk WA, Reinecke DL & van Staden J (2007) Seasonal variation in antifungal, antibacterial and acetylcholinesterase activity in seven South African seaweeds. Journal of Applied Phycology 19: 271-276

Street RA, Kulkarni MG, Stirk WA, Southway C & van Staden J (2007) Toxicity of metal elements on germination and seedling growth of widely used medicinal plants belonging to Hyacinthaceae. Bulletin of Environmental Contamination and Toxicity 79: 371-376

Arthur GD, Stirk WA & van Staden J (2006) Effects of autoclaving and charcoal on root-promoting substances present in water extracts made from gelling agents. Bioresource Technology 97: 1942-1950

Stirk WA, Thomson S & van Staden J (2006) Effect of rust-causing pathogen (Puccinia thlaspeos) on auxin-like and cytokinin-like activity in dyer’s woad (Isatis tinctoria). Weed Science 54: 815-820

Stirk WA & van Staden J (2006) Seaweed products as biostimulants in agriculture. In: Critchley AT, Ohna M & Largo DB (Eds). World Seaweed Resources. ETI Information Services Ltd., Wokingham, United Kingdom. DVD

Ananieva KI, Stirk WA, Kaminék M & van Staden J (2005) Some biochemical properties of cytokinin oxidase/dehydrogenase in Cucurbita pepo L. (zucchini) leaves. South African Journal of Botany 71: 253-256

Shale TL, Stirk WA & van Staden J (2005) Variation in antibacterial and anti-inflammatory activity of different growth forms of Malva parviflora and evidence for synergism of the anti-inflammatory compounds. Journal of Ethnopharmacology 96: 325-330

Stirk WA, Gold JD, Novák O, Strnad M & van Staden J (2005) Changes in endogenous cytokinins during germination and seedling establishment of Tagetes minuta L. Plant Growth Regulation 47: 1-7

Taylor NJ, Hills PN, Gold JD, Stirk WA & van Staden J (2005) Factors contributing to the regulation of thermoinhibition in Tagetes minuta L. Journal of Plant Physiology 162: 1270-1279

Arthur GD, Stirk WA & van Staden J (2004) Screening of aqueous extracts from gelling agents (Agar and Gelrite) for root-stimulating activity. South African Journal of Botany 70: 595-601

Ördög V, Stirk WA, Lenobel R, Bancírová M, Strnad M, van Staden J, Szigeta J & Neméth L (2004) Screening microalgae for some potentially useful agricultural and pharmaceutical secondary metabolites. Journal of Applied Phycology 16: 309-314

Ördög V, Stirk WA, van Staden J, Novák O & Strnad M (2004) Endogenous cytokinins in three genera of microalgae from the Chlorophyta. Journal of Phycology 40: 88-95

Shale TL, Stirk WA & van Staden J (2004) Effects of storage on antibacterial and COX-1 anti-inflammatory activity of three plants used as traditional medicines in Lesotho. South African Journal of Botany 70: 602-610

Stirk WA, Arthur GD, Lourens AF, Novák O, Strnad M & van Staden J (2004) Changes in cytokinin and auxin concentrations in seaweed concentrates when stored at an elevated temperature. Journal of Applied Phycology 16: 31-39

Stirk WA & van Staden J (2004) Potential new applications for the southern African kelps. South African Journal of Botany 70: 145-151

Arthur GD, Stirk WA & van Staden J (2003) Effect of seaweed concentrate on the growth and yield of three varieties of Capsicum annuum. South African Journal of Botany 69: 207-211

Stirk WA, Novák O, Strnad M & van Staden J (2003) Cytokinins in macroalgae. Plant Growth Regulation 41: 13-24

Stirk WA, Schwalb AN, Light ME, Medkova J, Lenobel R, Strnad M & van Staden J (2003) Potential medicinal value of some South African seaweeds. South African Journal of Botany 69: 462-468

Stirk WA & van Staden J (2003) Occurrence of cytokinin-like compounds and their exudates in two aquatic ferns. Environmental and Experimental Botany 49: 77-85

Stirk WA & van Staden J (2003) Algal biotechnology – some potential uses for algae. Current Topics in Plant Biology 4: 151-158

Taylor NJ, Stirk WA & van Staden J (2003) The elusive cytokinin biosynthetic pathway. South African Journal of Botany 69: 269-281

Nigro SA, Stirk WA & van Staden J (2002) Optimising heavy metal adsorbance by dried seaweeds. South African Journal of Botany 68: 333-341

Stirk WA, Ördög V, van Staden J & Jäger K (2002) Cytokinin- and auxin-like activity in Cyanophyta and Microalgae. Journal of Applied Phycology 14: 215-221

Stirk WA & van Staden J (2002) Desorption of cadmium and the reuse of brown seaweed derived products as biosorbents. Botanica Marina 45: 9-16

Stirk WA & van Staden J (2001) The role of cytokinins in root development of pea seedlings. Plant Growth Regulation 34: 173-180

Stirk WA & van Staden J (2001) Some physical factors affecting adsorption of heavy metals from solution by dried brown seaweed material. South African Journal of Botany 67: 615-619

Stirk WA & van Staden J (2000) Removal of heavy metals from solution using dried brown seaweed material. Botanica Marina 43: 467-475

Shale TL, Stirk WA & van Staden J (1999) Screening of medicinal plants used in Lesotho for anti-bacterial and anti-inflammatory activity. Journal of Ethnopharmacology 67: 347-354

Stirk WA, Ördög V & van Staden J (1999) Identification of the cytokinin isopentenyladenine in a strain of Arthronema africanum (Cyanobacteria). Journal of Phycology 35: 89-92

Jäger AK, Stirk WA & van Staden J (1997) Cytokinin oxidase activity in habituated and non-habituated soybean callus. Plant Growth Regulation 22: 203-206

Stirk WA, Aken ME & van Staden J (1997) Apical control of growth in a filamentous red alga (Ceramiaceae, Rhodophyta). South African Journal of Botany 63: 267-270

Stirk WA & van Staden J (1997) Comparison of cytokinin- and auxin-like activity in some commercially used seaweed extracts. Journal of Applied Phycology 8: 503-508

Stirk WA & van Staden J (1997) Screening of some South African seaweeds for cytokinin-like activity. South African Journal of Botany 63: 161-164

Stirk WA & van Staden J (1997) Isolation and identification of cytokinins in a new commercial seaweed product made from Fucus serratus L. Journal of Applied Phycology 9: 327-330

Du Plessis S, Stirk WA, Cress WA & van Staden J (1996) Biochemical comparisons of habituated and non-habituated callus lines of Glycine max L. cv. Acme. Plant Growth Regulation 18: 223-231

Stirk WA, Jäger AK & van Staden J (1996) Screening of some South African seaweeds for prostaglandin-synthesis inhibitors. South African Journal of Botany 62: 108-110

Stirk WA, Aken ME & van Staden J (1995) Effect of irradiance on photosynthesis in a filamentous red alga (Ceramiaceae, Rhodophyta). South African Journal of Botany 61: 153-157

Stirk WA, Aken ME & van Staden J (1995) Effect of light, temperature and pH on photosynthesis in a filamentous red alga (Ceramiaceae, Rhodophyta). South African Journal of Botany 61: 235-239

Stirk WA & Aken ME (1993) Growth and morphogenesis of a new red alga in the Ceramiaceae (Rhodophyta) from Natal coastal waters. South African Journal of Botany 59: 575-580