New Male Specific Markers for Hop and Application in Breeding Program

Area of Science:

• Plant genetics
• Molecular biology
• Horticulture

Background:

• Sex determination in hops (Humulus lupulus L.) is crucial for breeding programs.
• Traditional methods for sex determination can be time-consuming and inefficient.
• Molecular markers offer a potential solution for early and accurate sex identification.

Purpose of the Study:

• To evaluate male-specific DNA sequences for sex determination in hop seedlings.
• To develop and optimize PCR-based molecular markers for routine application.
• To establish a fast, low-cost, and accurate method for sex screening in hop breeding.

Main Methods:

• Selection of male-specific DNA sequences from a Diversity Arrays Technology (DArT) mapping study.
• Conversion of DArT markers into PCR markers and development of a multiplex PCR approach.
• Validation of marker accuracy using phenotypic data from hop plants and progenies.

Main Results:

• Ten male-specific DArT markers showed complete linkage with male sex phenotype.
• Four markers were converted to PCR markers, with a multiplex approach achieving 100% correlation with sex phenotype.
• Crude sample multiplex PCR demonstrated high accuracy (94-100%) in large segregating populations.

Conclusions:

• Molecular markers linked to male sex provide a reliable tool for seedling sex determination in hop breeding.
• The developed multiplex PCR method is efficient, cost-effective, and suitable for routine application.
• This approach can significantly improve hop breeding programs by enabling early selection of desirable female plants worldwide.