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Elevated CO2 changes the interactions between nematode and tomato genotypes differing in the JA pathway.

Yucheng Sun1, Haifeng Cao, Jin Yin

  • 1State Key Laboratory of Integrated Management of Pest and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.

Plant, Cell & Environment
|June 4, 2010
PubMed
Summary
This summary is machine-generated.

Elevated CO2 increases tomato plant growth but may reduce nematode resistance in some genetically modified varieties. This occurs by disrupting the balance between plant growth and defense mechanisms, impacting resource allocation.

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Area of Science:

  • Plant-nematode interactions
  • Plant physiology under elevated CO2
  • Genetically modified crop resistance

Background:

  • Root-knot nematodes (Meloidogyne incognita) pose a significant threat to tomato (Lycopersicon esculentum) production.
  • Understanding plant responses to elevated atmospheric CO2 is crucial for predicting agricultural outcomes.
  • Genetically modified tomatoes with varying defense mechanisms offer a model to study plant resource allocation.

Purpose of the Study:

  • To investigate the impact of elevated CO2 on tomato genotypes with different defense strategies in their interaction with root-knot nematodes.
  • To test the hypothesis that elevated CO2 alters carbon allocation towards growth in defense-recessive genotypes and towards defense in defense-dominated genotypes.
  • To assess how elevated CO2 influences plant biomass, nutrient content, antioxidant enzyme activity, volatile organic compound (VOC) emissions, and nematode susceptibility.

Main Methods:

  • Three isogenic tomato genotypes were grown under ambient (370 ppm) and elevated (750 ppm) CO2 conditions.
  • Plants were inoculated with Meloidogyne incognita to study nematode interactions.
  • Measurements included plant height, biomass, total non-structural carbohydrates (TNC):N ratio, amino acids, proteins, antioxidant enzyme activity (superoxide dismutase, catalase), VOC emissions, and nematode galling.

Main Results:

  • Elevated CO2 increased height, biomass, and TNC:N ratio, while decreasing leaf amino acids and proteins across all genotypes.
  • Nematode infection enhanced antioxidant enzyme activity in defense-recessive genotypes.
  • Elevated CO2 increased nematode galls on defense-dominated genotypes but not on wild-type or defense-recessive genotypes.

Conclusions:

  • Elevated CO2 alters plant carbon-to-nitrogen ratios and can disrupt the balance between growth and defense mechanisms in some genetically modified tomatoes.
  • This disruption may lead to reduced resistance against nematode infections under future climate conditions.
  • The findings highlight the complex interplay between abiotic factors (CO2) and biotic interactions (nematodes) in determining crop vulnerability.