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Plant Breeding and Biotechnology01:59

Plant Breeding and Biotechnology

Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
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Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Mutation, Gene Flow, and Genetic Drift01:09

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...

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Related Experiment Video

Updated: Jun 16, 2026

Breeding by Design for Functional Rice with Genome Editing Technologies
09:43

Breeding by Design for Functional Rice with Genome Editing Technologies

Published on: January 3, 2025

Accessing genetic diversity for crop improvement.

J C Glaszmann1, B Kilian, H D Upadhyaya

  • 1UMR DAP, CIRAD, TA A96/03, Avenue Agropolis, Montpellier, Cedex 5, France. glaszmann@cirad.fr

Current Opinion in Plant Biology
|February 20, 2010
PubMed
Summary
This summary is machine-generated.

Accessing genetic diversity in crop collections remains challenging. New molecular tools enable precise analysis of plant traits and adaptation, aiding crop improvement efforts.

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Area of Science:

  • Plant genetics
  • Crop science
  • Agricultural research

Background:

  • Extensive germplasm collections exist but are underutilized for crop improvement due to challenges in accessing genetic diversity.
  • Molecular markers have significantly advanced the understanding of genetic diversity structures across various crops.
  • Recent technological progress allows for whole-genome and gene-targeted surveys, revealing insights into population dynamics and domestication impacts.

Purpose of the Study:

  • To highlight the analytical power gained in germplasm description through new molecular precision.
  • To address the challenge of finely characterizing plant behavior and genetic underpinnings of traits.
  • To propose strategies for more effective utilization of genetic resources in crop improvement.

Main Methods:

  • Utilizing molecular markers for clarifying genetic diversity structures.
  • Implementing whole-genome and gene-targeted surveys.
  • Analyzing population dynamics and the impact of selection during crop domestication.

Main Results:

  • Enhanced analytical power in germplasm description for understanding trait variation and adaptation.
  • Detailed insights into genetic bases of adaptation in major crops like cereals, chickpea, grapevine, cacao, and banana.
  • Identification of challenges in fully characterizing plant behavior and genetic diversity.

Conclusions:

  • Precision in molecular analysis has improved germplasm description for crop improvement.
  • Characterizing diverse plant behaviors and genetic traits requires careful selection of materials.
  • Expanding the use of 'core reference sets' can facilitate community-wide sharing and utilization of genetic resources.