Related Experiment Video
Updated: Feb 10, 2026
05:37
Author Spotlight: Enhancing Rhizobacteria Colonization on Plant Roots for Improved Microbial Fertilizer Efficiency
Published on: March 1, 2024
1.6K
Elevated temperature increases meiotic crossover frequency via the interfering (Type I) pathway in Arabidopsis
Jennifer L Modliszewski1, Hongkuan Wang2, Ashley R Albright1
1Department of Biology and the Integrative Program for Biological and Genome Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America.
Plos Genetics
|May 18, 2018
Summary
Elevated temperatures increase crossover (CO) events during meiosis in Arabidopsis thaliana. This heat-induced hyper-recombination originates from the Type I pathway and is specific to thermal stress.
Area of Science:
- Plant biology
- Genetics
- Molecular biology
Background:
- Meiosis is essential for sexual reproduction in eukaryotes.
- Meiotic crossovers (COs) ensure accurate chromosome segregation.
- Environmental factors influence CO frequency, but mechanisms are poorly understood.
Purpose of the Study:
- Investigate the impact of elevated temperature on meiotic recombination in Arabidopsis thaliana.
- Elucidate the molecular pathways involved in heat-induced hyper-recombination.
Main Methods:
- Genetic analysis of Arabidopsis thaliana mutants in recombination pathways.
- Quantification of meiotic crossover events under elevated temperatures.
Main Results:
- Elevated temperatures induce a significant increase in meiotic recombination (hyper-recombination).
- The observed increase in COs is mediated by the Type I interference-sensitive pathway.
- Heat-induced COs do not result from increased DNA double-strand breaks.
- The hyper-recombinant phenotype appears specific to thermal stress.
Conclusions:
- Environmental cues, such as temperature, can modulate plant meiotic recombination.
- Provides mechanistic insights into how thermal stress affects meiotic recombination.
- Potential applications in plant breeding and genetic manipulation.
Related Concept Videos
01:25Increased Body Temperature
7.5K
A body temperature above 38°C (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
7.5K
02:30siRNA - Small Interfering RNAs
18.7K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
18.7K
03:12Freezing Point Depression and Boiling Point Elevation
40.4K
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
40.4K
01:16Crossover Experiments
4.6K
Crossover experiments, also called the repeated-measurements design, is a study design in which all experimental units are exposed to all treatments in different periods. Crossover experiments are generally used in psychology, the pharmaceutical industry, agriculture, and medicine.
Crossover designs are performed even with smaller sample sizes since the samples can act as their controls. These are better than simple randomized trials since patients are exposed to all the treatments.
Crossover designs are performed even with smaller sample sizes since the samples can act as their controls. These are better than simple randomized trials since patients are exposed to all the treatments.
4.6K
02:55Temperature Dependence on Reaction Rate
89.3K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
89.3K
02:30Small interfering RNAs (siRNA)
4.6K
4.6K