Molecular Microbiology Research, 2025, Vol.15, No.2, 59-68 http://microbescipublisher.com/index.php/mmr 64 to breed since 1998. They used molecular markers to select materials that were resistant to potato virus Y (PVY) and other diseases, and later developed many disease-resistant varieties (Ortega and Lopez-Vizcon, 2012). In another study, breeders tracked 68 offspring to find individuals with Rpi disease resistance genes. They used SCAR markers and found the targets in a short while, greatly reducing the workload of early screening (Beketova et al., 2021). There is also a method called "multiple PCR" that can detect multiple disease-resistant genes at the same time. This method makes the breeding process faster and more convenient, allowing the selection of plants with multiple resistances directly (Mori et al., 2011). 6.3 Integration of omics technologies in breeding In addition to the genes themselves, breeders now use many "omics" technologies, such as genomics, transcriptomics, proteomics and metabolomics. These techniques can help us understand how the properties of potatoes come from different angles. Through these methods, scientists can identify genes that affect yield, disease resistance, or quality, as well as different versions of these genes. This is helpful for breeding and can improve accuracy. For example, some people use whole genome resequencing and mixed DNA sequencing to integrate various markers into a SNP platform, so that MAS (marker-assisted selection) can be used more widely and efficiently (Meade et al., 2019). In addition, technologies like CRISPR-Cas9 and RNAi have also begun to be used to improve potatoes. They can accurately regulate certain genes and are used to improve tuber yield and quality (Ahmad et al., 2022). These techniques show that potato breeding has moved from traditional methods to a more efficient and accurate molecular era. 7 Case Studies of Successful Breeding Programs 7.1 Early-maturing, high-quality varieties developed globally In many countries around the world, breeding experts are working hard to cultivate premature and high-quality potato varieties. For example, in the Kabarda-Balkaria mountainous area, researchers screened about 4,000 hybrid materials and finally selected 9 high-yield and disease-resistant strains. One of the medium-premature varieties called "Zamir" has a growth cycle of only 55 to 70 days. In a suitable climate, the yield per hectare can reach 66.2 tons (Abazov et al., 2021). In Poland, the Institute of Plant Breeding and Domestication has also done a lot of work. Through long-term breeding, they have developed 72 potato varieties. These varieties can resist major diseases such as potato Y virus and late blight. These achievements have greatly improved the ability to adapt to the climate and soil conditions in different regions, and have also laid the foundation for the promotion of high-yield and high-quality varieties. 7.2 Stress-resistant potato breeding in arid and semi-arid regions The climate in arid and semi-arid areas is relatively extreme, and potatoes are easily affected by heat and water shortage. Therefore, it is particularly important to cultivate drought-resistant, salt-resistant and heat-resistant varieties. Current genetic technology can be used to improve these stress resistance. Some studies have found that key factors such as antioxidant enzymes and transcription factors are very important in improving resistance and are very helpful for future breeding (Kikuchi et al., 2015). The researchers also used X-ray CT technology to observe the growth of potatoes in drought and high temperatures. The results show that when adversity is lifted, tubers can resume growth, indicating that there is hope of breeding varieties that can "survive" harsh environments (Harsselaar et al., 2021). In India, researchers analyzed the use of highly resistant varieties. They found that precocious varieties were more likely to adapt to climate change and played a positive role in sustainable agricultural development (Pradel et al., 2019). 7.3 Impacts on yield and farmer adoption Premature and stress-resistant varieties not only increase potato yields, but also gain recognition from farmers. Take the Zamir variety as an example. It not only produces a high yield of 49.5 tons/hectare, but also has good storage capacity of tubers. These advantages make farmers willing to plant it. In Poland, after introducing new parents, the new varieties bred are more resistant to diseases, and also help farmers reduce losses and improve benefits (Figure 3) (Zimnoch-Guzowska et al., 2021). In India, regions that promote highly resistant varieties like
RkJQdWJsaXNoZXIy MjQ4ODYzNA==