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Updated: Jan 28, 2026

The Plant Infection Test: Spray and Wound-Mediated Inoculation with the Plant Pathogen Magnaporthe Grisea
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Mating Type Distribution and Fertility Status of Magnaporthe grisea Populations from Various Hosts in India

G Viji1, S S Gnanamanickam2

  • 1Senior Research Fellow.

Plant Disease
|March 13, 2019
PubMed

Insights

Fertile perithecia production by Indian Magnaporthe grisea isolates is rare, especially in rice-infecting strains. However, finger millet and paragrass isolates showed fertility, indicating Mendelian inheritance patterns in this important plant pathogen.

Area of Science:

  • Plant Pathology
  • Mycology
  • Genetics

Background:

  • Magnaporthe grisea is a significant plant pathogen causing blast disease in various crops.
  • Sexual reproduction in M. grisea, involving perithecia, asci, and ascospores, is crucial for genetic diversity and pathogen evolution.
  • Previous studies indicated rarity of sexual reproduction in Indian M. grisea isolates, particularly in Southern India.

Purpose of the Study:

  • To investigate the distribution of mating types (MAT1-1 and MAT1-2) in Indian M. grisea isolates infecting finger millet and paragrass.
  • To determine the capacity for sexual reproduction (perithecia formation) in these isolates under laboratory conditions.
  • To analyze the inheritance patterns of fertility in M. grisea.

Main Methods:

  • Isolation and characterization of 138 monoconidial M. grisea isolates from rice, finger millet, and paragrass.
  • Laboratory matings of isolates with known fertile testers to assess perithecia and ascospore production.
  • Backcrossing of ascospore progenies to parental and tester strains to study fertility inheritance.

Main Results:

  • Fertile perithecia were produced by 28 out of 96 finger millet isolates and 5 out of 16 paragrass isolates.
  • None of the 26 rice-infecting isolates produced fertile perithecia.
  • Backcrosses confirmed Mendelian inheritance patterns of fertility in M. grisea.

Conclusions:

  • Sexual reproduction in M. grisea is possible in Indian isolates, particularly those infecting finger millet and paragrass.
  • Rice-infecting isolates in this study showed no capacity for sexual reproduction.
  • The study provides evidence for Mendelian inheritance of fertility, offering insights into the genetic mechanisms of M. grisea.
Keywords:
blastfinger milletperithecia

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