Related Experiment Video
Updated: May 27, 2026

Methods to Inhibit Bacterial Pyomelanin Production and Determine the Corresponding Increase in Sensitivity to Oxidative Stress
Published on: August 31, 2015
Variability of yellow tulp (Moraea pallida Bak.) toxicity
L D Snyman1, R A Schultz, H van den Berg
1Section of Toxicology, ARC-Onderstepoort Veterinary Institute, Private Bag X05, Onderstepoort 0110, South Africa. snyman@oranet.co.za
Yellow tulp (Moraea pallida Bak.) toxicity varies significantly across South Africa. Some plants, particularly from the Northern Cape, showed very low toxicity levels.
Area of Science:
- Botany
- Pharmacology
- Toxicology
Background:
- Moraea pallida Bak., commonly known as yellow tulp, is a plant found in South Africa.
- Cardiac glycosides, such as digoxin, are known to be present in some plant species and can cause toxicity.
Purpose of the Study:
- To assess the variability in toxicity of yellow tulp (Moraea pallida Bak.) collected from different locations in South Africa.
- To quantify the digoxin equivalent values in yellow tulp samples.
Main Methods:
- Yellow tulp samples were collected during their flowering stage from various South African sites.
- Digoxin equivalent values were determined for each sample to assess toxicity.
Main Results:
- Significant variation in digoxin equivalent values was observed across the collected yellow tulp samples.
- Samples from certain sites in the Northern Cape exhibited notably low digoxin equivalent values.
Conclusions:
- The toxicity of yellow tulp (Moraea pallida Bak.) is not uniform and varies geographically.
- Further investigation into the factors influencing yellow tulp toxicity in different regions, especially the Northern Cape, is warranted.
Related Concept Videos
Drug Toxicity: Dose-Dependent Reactions
Lethal Alleles
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Drug toxicity: Idiosyncratic Reactions
Background and Environment Affect Phenotype
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Toxicity Testing in Animals
Drug Toxicity: Risk factors
