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C4 anatomy can evolve via a single developmental change.

Marjorie R Lundgren1, Luke T Dunning1, Jill K Olofsson1

  • 1Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK.

Ecology Letters
|December 18, 2018
PubMed
Summary
This summary is machine-generated.

C4 photosynthesis, a key trait for plant productivity in warm climates, surprisingly evolved multiple times. This study reveals increased vein density, specifically minor veins, is the crucial anatomical change enabling C4 function.

Keywords:
AlloteropsisC3-C4 intermediateC4 photosynthesisbundle sheathevolutiongrassleaf anatomymesophyllvein density

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Area of Science:

  • Plant Biology
  • Evolutionary Biology
  • Plant Physiology

Background:

  • C4 photosynthesis enhances crop productivity in warm climates but requires specialized leaf anatomy.
  • Previous studies on C4 evolution relied on interspecific comparisons, confounding trait analysis.
  • Understanding the anatomical prerequisites for C4 evolution is crucial for crop improvement.

Discussion:

  • This study quantifies anatomical changes during the non-C4 to C4 transition within Alloteropsis semialata.
  • Increased vein density, driven by minor vein proliferation, is identified as a key anatomical adaptation.
  • This vein development facilitates C4 function and offers secondary benefits.

Key Insights:

  • Increased vein density, specifically minor veins, is the sole shared and specific anatomical trait distinguishing C4 individuals in Alloteropsis semialata.
  • Minor vein proliferation is a critical anatomical precursor for C4 photosynthesis.
  • Developmental vein proliferation can be sufficient for establishing C4 leaf anatomy.

Outlook:

  • This research provides an evolutionary entry point for understanding complex C4 syndromes.
  • Identifying anatomical preconditions can guide strategies for engineering C4 traits in crops.
  • Further research can explore the genetic basis of vein development in C4 evolution.