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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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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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Multipronged Phenotyping Approaches to Characterize Sugarcane Root Systems
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Selection in sugarcane based on inbreeding depression.

A A C de Azeredo1, L L Bhering1, B P Brasileiro2

  • 1Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa, MG, Brasil.

Genetics and Molecular Research : GMR
|June 21, 2016
PubMed
Summary
This summary is machine-generated.

Sugarcane breeding shows promise for high fiber content (FIB) using individual reciprocal recurrent selection (RRSI-S1). Additive gene action for FIB means it is unaffected by inbreeding depression, unlike other yield traits.

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Area of Science:

  • Plant Breeding
  • Genetics
  • Agronomy

Background:

  • Sugarcane yield and quality are critical for economic viability.
  • Understanding gene action is essential for effective breeding strategies.
  • Inbreeding depression can negatively impact crop performance.

Purpose of the Study:

  • Evaluate gene action for yield traits (MSW, TCH, FIB).
  • Verify the viability of individual reciprocal recurrent selection (RRSI-S1).
  • Assess inbreeding depression effects on S1 progenies and select superior genotypes.

Main Methods:

  • Evaluated eight sugarcane clones and their S1 progenies.
  • Utilized a randomized block design with hierarchical classification.
  • Assessed traits including stalk weight, tons/hectare, and fiber content.

Main Results:

  • Mean stalk weight (MSW) and tons of sugarcane per hectare (TCH) showed dominance variance and were affected by inbreeding depression.
  • Fiber content (FIB) exhibited additive gene action and was not impacted by selfing.
  • Specific progenies (RB867515, RB928064, RB739359, RB925345) showed superior performance for FIB.

Conclusions:

  • Individual reciprocal recurrent selection (RRSI-S1) using S1 progenies is a promising strategy for sugarcane breeding.
  • This approach is particularly effective for developing clones with high fiber content.
  • Future breeding efforts should focus on exploring RRSI-S1 for enhanced FIB levels.