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Trihybrid Crosses

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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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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.
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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Bread wheat (T. aestivum) variability: Phenotypic and genotypic data from 75 varieties.

Mélanie Lavoignat1,2, Emmanuelle Bancel1, Hélène Rimbert1

  • 1Université Clermont Auvergne-INRAE, UMR1095 GDEC, Clermont-Ferrand, France.

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|December 30, 2022
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Summary

This study explores bread wheat storage protein diversity using genotypic and phenotypic data. Findings reveal variability influencing grain quality and dough properties, crucial for processing.

Keywords:
Genotypic markersGluten polymersRheological propertiesStorage protein compositionTriticum aestivum L.Wheat grain quality

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Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Food Science

Background:

  • Bread wheat quality for processing relies heavily on grain storage proteins, which form the gluten network essential for dough viscoelasticity.
  • Understanding the diversity in protein content and composition is critical for improving end-use quality in milled wheat products.

Purpose of the Study:

  • To investigate the genotypic and phenotypic variability of grain storage proteins in bread wheat accessions.
  • To analyze the impact of genetic and environmental factors on traits related to wheat grain protein quality.

Main Methods:

  • Phenotyping 75 bread wheat accessions for grain hardness, thousand-kernel weight, and nitrogen content.
  • Characterizing flour protein composition using reverse-phase high-performance liquid chromatography (RP-HPLC) and asymmetric flow field-flow fractionation (AF4).
  • Assessing dough technological properties with Glutomatic and Chopin alveograph systems, alongside genotyping with a 35k SNP array.

Main Results:

  • The study generated a dataset encompassing raw data, protocols, and figures detailing genotypic and phenotypic variations.
  • Significant variability was observed in grain protein content, composition, molecular distribution, and dough properties across different wheat accessions.
  • The data provides a foundation for exploring the genetic architecture underlying wheat grain protein quality traits.

Conclusions:

  • The generated dataset offers valuable insights into the diversity of bread wheat storage proteins.
  • This resource can facilitate research into the genetic and environmental influences on wheat quality traits, aiding breeding programs.
  • Understanding these variations is key to enhancing wheat processing suitability and end-product characteristics.