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Related Concept Videos

Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.

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Related Experiment Video

Updated: May 12, 2026

Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce (Lactuca sativa) Germplasm Collections
06:35

Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce (Lactuca sativa) Germplasm Collections

Published on: April 17, 2015

An Ultra-High-Density, Transcript-Based, Genetic Map of Lettuce.

Maria José Truco1, Hamid Ashrafi2, Alexander Kozik1

  • 1The Genome Center, University of California, Davis, California 95616.

G3 (Bethesda, Md.)
|April 4, 2013
PubMed
Summary

Researchers created an ultra-high-density genetic map for lettuce, featuring 13,943 markers. This detailed lettuce genetic map aids in identifying genes for various traits and enables comparative genomics studies.

Keywords:
Lactuca sativalinkage analysismicroarrayrecombination

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Last Updated: May 12, 2026

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Area of Science:

  • Plant genetics
  • Genomics
  • Agricultural science

Background:

  • Lettuce (Lactuca spp.) is an economically important crop.
  • Developing high-density genetic maps is crucial for understanding complex traits and accelerating breeding.

Purpose of the Study:

  • To construct an ultra-high-density genetic map for lettuce.
  • To identify candidate genes for multiple phenotypes.
  • To facilitate syntenic studies with other plant species.

Main Methods:

  • Generated an ultra-high-density genetic map using 12,842 unigenes and 13,943 markers.
  • Utilized a custom Affymetrix oligonucleotide array for genomic DNA hybridization.
  • Analyzed segregation of single-position polymorphisms in 213 recombinant inbred lines derived from Lactuca sativa and L. serriola.

Main Results:

  • Mapped 12,842 unigenes (13,943 markers) into 3696 genetic bins across nine chromosomal linkage groups.
  • Identified single-position polymorphisms assigned to parental haplotypes.
  • Anchored the new map to a previously published integrated map of lettuce.

Conclusions:

  • The ultra-high-density genetic map provides a valuable resource for lettuce genetics and breeding.
  • The map facilitates the identification of candidate genes for various traits.
  • Enables comparative genomics and syntenic analyses with other plant species, including Vitis vinifera.