Field Crop 2025, Vol.8, No.4, 166-175 http://cropscipublisher.com/index.php/fc 172 8 Future Perspectives 8.1 Role of high-throughput sequencing and pan-genome analyses There are many methods for studying the genetic diversity of corn, but it is now difficult to bypass high-throughput sequencing and whole-genome analysis. In the early years, sequencing of important strains such as B73 and Palomero was regarded as a major advancement, but this was only the beginning. The new generation of sequencing platforms that emerged later are not only fast and large-scale, but also capable of conducting large-scale genotyping at one time and performing genome-wide association studies (GWAS) to identify key genes related to agronomic traits. Sometimes, these analyses do not only focus on common variations; rare haplotypes and structural changes can also be captured (Liu et al., 2019). In this way, the detailed picture of the genome becomes more complete. Ultimately, this information will be returned to breeding to assist breeders in more precise seed selection and improvement. 8.2 Integration of climate-resilience traits into breeding programs Climate change is already an issue at hand. Whether admitted or not, for corn to maintain high yields in the future environment, it will have to rely on global diverse resources. There is no one-size-fits-all solution for this matter. High-throughput genotyping must be used in conjunction with precise phenotypic analysis to identify those alleles that are drought-resistant, heat-resistant and disease-resistant. For instance, the "Discovering Seeds" project of the International Maize and Wheat Improvement Center (CIMMYT) aims to identify genes with stress resistance and high nutritional value in different germplasms (Andorf et al., 2019). Once these genes are identified, they can be included in the breeding program to help develop varieties that are more adaptable to future climates. Ultimately, the speed of improvement largely depends on how closely genomic data and phenotypic data are combined. 8.3 Importance of international collaboration and open-access genetic databases The challenge of corn is global, so it is difficult for a single institution to solve it alone. Cooperation among different countries and institutions is not only for preserving germplasm resources, but also for sharing data and experience (Shiferaw et al., 2011). If some information is not made open, many resources will be wasted. Therefore, it is urgent to establish an open access gene database and a global phenotypic network (Hou et al., 2024). In this way, researchers and breeders can use these data and germplasm efficiently no matter which country they are in. CIMMYT's SeeD project has demonstrated the benefits of this model-cooperation and openness, enabling the improvement results to be transformed into products useful to the public more quickly. 9 Concluding Remarks The global corn germplasm resources have a high degree of genetic diversity and a complex population structure. Most genetic differences exist within subpopulations, and there are also moderate differences between subpopulations. Many studies have identified several major heterosis groups and subgroups, which are usually influenced by breeding history, artificial selection and local environmental adaptability. Both phenotypic analysis and molecular analysis have demonstrated that superior inbred lines, local varieties and breeding populations still retain significant genetic differences, which is crucial for the continuous improvement of corn. Genetic diversity is the foundation for corn to adapt to different agricultural ecological zones and constantly changing environments. Unique hybrid vigor groups and rare alleles help to cultivate hybrid varieties with higher yields, stronger stress resistance and better other agronomic traits. The rational utilization of these diversities can enable breeders to expand the genetic base, leverage hybrid vigor, and adapt to the constantly changing breeding goals, thereby ensuring food security and sustainable production. Whether corn can maintain high yields consistently and keep up with environmental changes actually depends not only on technology but also on the limited potential of the existing varieties themselves. Germplasm resources must be constantly sought and utilized, and this step cannot be halted. What method can be used? Molecular markers, genome-wide association analysis, and field trials-it is best to combine these to more accurately classify different heterosis groups and make it easier to identify valuable new alleles. But to be honest, this is only one step. The materials themselves should also be more comprehensive, especially those regional resources that have
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