Related Experiment Video
Updated: Jul 9, 2026
08:35
Methods for Performing Crosses in Setaria viridis, a New Model System for the Grasses
Published on: October 1, 2013
Galls on thistles
Gregory J Masters1, Nicola L Ward
1CABI Bioscience, Egham, UK. g.masters@cabi.org
Biologist (London, England)
|March 1, 2003
Summary
Insect galls are formed by about 15,000 species, yet their purpose remains unclear. Thistle-galling insects are well-studied and used in biological control and ecological research.
Area of Science:
- Entomology
- Ecology
- Plant-Insect Interactions
Background:
- Plant galls are abnormal growths induced by insects.
- Gall-inducing insects represent approximately 2% of all known insect species.
- Gall formation is a widespread phenomenon across diverse floras and latitudes.
Purpose of the Study:
- To explore the ecological significance and evolutionary drivers of plant gall formation.
- To investigate the diversity of insect species that induce plant galls.
- To understand the role of thistle-galling insects as model systems and biological control agents.
Main Methods:
- Literature review and synthesis of existing research on plant galls.
- Analysis of insect species diversity and distribution data related to galling.
- Case study examination of well-documented thistle-galling insect systems.
Main Results:
- Approximately 15,000 insect species are known to induce plant galls.
- Despite their prevalence, a general consensus on the evolutionary purpose of galls is lacking.
- Thistle-galling insects are extensively studied and utilized in biological control and ecological modeling.
Conclusions:
- Plant gall formation is a complex phenomenon with significant biodiversity implications.
- Further research is needed to elucidate the fundamental reasons behind gall induction.
- Thistle-galling insects offer valuable insights into ecological interactions and pest management strategies.
Related Concept Videos
01:18Dihybrid Crosses
Overview
02:26Non-vascular Seedless Plants
The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
03:24Seedless Vascular Plants
Seedless Vascular Plants Were the First Tall Plants on Earth
03:40Introduction to Seed Plants
Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.
02:40Pollination and Flower Structure
Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
02:26Defenses Against Pathogens and Herbivores
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.