DNA Polymorphisms in Lentinula edodes, the Shiitake Mushroom.

Area of Science:

• Mycology
• Molecular Biology
• Genetics

Background:

• Lentinula edodes, the shiitake mushroom, is economically important.
• Understanding genetic diversity is crucial for strain improvement and breeding.

Purpose of the Study:

• To analyze genetic variation within Lentinula edodes using DNA restriction fragment length polymorphisms (RFLPs).
• To assess genetic relatedness among different strains and examine RFLP marker inheritance.

Main Methods:

• Genomic DNA from Lentinula edodes strain 70 was cloned into pUC19.
• Eighteen random low-copy DNA clones were used as probes in Southern DNA-DNA hybridizations across seven strains.
• RFLP genotypes were determined, and genetic similarity coefficients were calculated.
• RFLP marker inheritance was studied in single spore isolates, homokaryons, and dikaryotic hybrids.

Main Results:

• All 18 cloned fragments revealed DNA polymorphism among the seven Lentinula edodes strains.
• Coefficients of genetic similarity ranged from 0.43 to 0.90, indicating significant genetic variation.
• Homokaryons showed a reduction in polymorphic bands compared to the parent dikaryon.
• Constructed hybrids exhibited inheritance of RFLP markers from both parent homokaryons.

Conclusions:

• RFLPs are effective markers for assessing genetic diversity and relatedness in Lentinula edodes.
• The study provides a framework for understanding the genetic structure and inheritance patterns in this important mushroom species.
• These findings can inform future breeding programs and strain selection for improved Lentinula edodes cultivation.