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Low Infection of

Shoko Hasegawa1, Takuya Tsutsumi2, Shunsuke Fukushima3

  • 1Graduate School of Life Sciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan. stm4022xqi@gmail.com.

International Journal of Molecular Sciences
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

Strigolactones (SLs) regulate plant growth. We identified tomato mutants deficient in SLs, showing altered branching and reduced parasitic plant germination, suggesting resistance to Phelipanche aegyptiaca.

Keywords:
Orobanche minorPhelipanche aegyptiacaSolanum lycopersicumcarotenoid cleavage dioxygenase 8shoot branchingstrigolactones

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Area of Science:

  • Plant Biology
  • Hormone Signaling
  • Crop Science

Background:

  • Strigolactones (SLs) are plant hormones controlling shoot branching and parasitic plant germination.
  • Parasitic plants like Phelipanche spp. cause significant damage to tomato crops.
  • Developing resistant tomato cultivars is crucial for agricultural sustainability.

Purpose of the Study:

  • To investigate the role of strigolactones in tomato plant development and parasitic plant interactions.
  • To identify and characterize tomato mutants with altered strigolactone biosynthesis or signaling.
  • To evaluate the potential of these mutants for developing resistance against root parasitic weeds.

Main Methods:

  • Utilized the TILLING (Targeting Induced Local Lesions in Genomes) method to screen for tomato mutants.
  • Generated carotenoid cleavage dioxygenase 8-defective (slccd8) mutants in Micro-Tom tomato.
  • Employed grafting experiments, exogenous SL application, and rhizotron systems for analysis.

Main Results:

  • The slccd8 mutants exhibited excessive shoot branching, which was reversed by exogenous SL application.
  • Endogenous SL levels were undetectable in mutants, and their root exudates showed reduced stimulation of parasitic plant germination.
  • Parasitic plant infection (Phelipanche aegyptiaca) was significantly lower in slccd8 mutants compared to wild-type.
  • SL deficiency did not critically impact tomato fruit traits.

Conclusions:

  • The slccd8 tomato mutants are deficient in strigolactones, leading to altered branching and reduced parasitic plant germination.
  • These mutants demonstrate potential as a new tomato line with enhanced resistance to Phelipanche aegyptiaca.
  • Understanding SL pathways offers opportunities for developing novel crop protection strategies.