Diploid inbred-based hybrids: fast-forward breeding approach in potatoes

Area of Science:

• Plant genetics and breeding
• Agricultural science
• Genomics

Background:

• Tetraploid potato cultivation is historically significant but faces challenges in genetic gain due to complex inheritance and heterozygosity.
• Diploid hybrid TPS (Transformed Potato Seed) potato breeding emerged as a strategy to enhance genetic improvement, mirroring successes in hybrid maize.
• Overcoming self-incompatibility and inbreeding depression in diploid potatoes is crucial for developing stable inbred lines.

Purpose of the Study:

• To review the progress and insights in diploid hybrid TPS potato breeding.
• To highlight advancements in understanding and addressing genetic challenges in potato breeding.
• To discuss the potential of new technologies in revolutionizing potato crop improvement.

Main Methods:

• Identification of the self-compatibility gene (Sli).
• Development of di-haploids from popular potato varieties.
• Mapping of self-incompatibility inhibitor genes.
• Genetic studies on inbreeding depression and identification of deleterious alleles.
• Genome sequencing of diploid inbred lines.

Main Results:

• Significant progress in understanding the genetic basis of self-incompatibility and inbreeding depression.
• Identification of genomic regions associated with fertility and key breeding traits.
• Successful genome sequencing of diploid inbred lines providing valuable genetic information.
• Demonstrated potential for diploid hybrid breeding to increase genetic gain.

Conclusions:

• Advances in genetics, genomics, and genome editing show great promise for the success of diploid hybrid TPS potato breeding.
• Addressing genetic barriers like self-incompatibility and inbreeding depression is key to unlocking the potential of diploid potato improvement.
• The insights gained are paving the way for more efficient and effective potato breeding strategies.