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A putative major gene for rust resistance linked with a RFLP marker in sugarcane cultivar 'R570'.

J H Daugrois1, L Grivet, D Roques

  • 1CIRAD, Station de Roujol, 97170 Petit Bourg, Guadeloupe.

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Rust resistance in sugarcane is inherited through a single dominant gene, a first for this crop. This finding aids in developing rust-resistant sugarcane varieties through genetic mapping.

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Area of Science:

  • Plant genetics
  • Agricultural science
  • Pathology

Background:

  • Sugarcane rust poses a significant threat to crop yield.
  • Understanding the genetic basis of disease resistance is crucial for breeding resistant cultivars.
  • Previous studies on sugarcane disease resistance inheritance have been limited.

Purpose of the Study:

  • To investigate the inheritance pattern of rust resistance in sugarcane cultivar 'R570'.
  • To identify genetic markers linked to rust resistance.
  • To establish a foundation for marker-assisted selection in sugarcane breeding.

Main Methods:

  • Self-progeny of sugarcane cultivar 'R570' were generated.
  • Resistance was assessed through field and controlled greenhouse trials.
  • Segregation analysis and Restriction Fragment Length Polymorphism (RFLP) mapping were employed.

Main Results:

  • A 3:1 segregation ratio of resistant to susceptible plants was observed, indicating monogenic dominant inheritance.
  • A single dominant gene confers significant rust resistance.
  • This resistance gene is located 10 centimorgans (cM) from an RFLP marker identified by probe CDSR29.
  • Minor genetic factors also contribute to overall resistance.

Conclusions:

  • Monogenic inheritance of rust resistance has been documented for the first time in sugarcane.
  • The identified linked RFLP marker can be utilized in breeding programs.
  • Further research can explore the minor genetic factors for comprehensive resistance strategies.