Tree Genetics and Molecular Breeding 2024, Vol.14, No.2, 95-105 http://genbreedpublisher.com/index.php/tgmb 103 Moreover, the results from GWAS also help understand the genetic regulatory networks underlying ornamental tree traits, providing a deeper understanding for the genetic improvement of complex traits. The accumulation and application of this genetic information will greatly promote the innovation and improvement of ornamental tree varieties, meeting the future needs of landscape design and urban greening. By directionally improving the aesthetic and adaptive traits of ornamental trees, more diverse and personalized landscape designs can be achieved while ensuring that trees maintain good growth conditions and ecological functions in the face of increasingly severe environmental challenges. The application of GWAS technology in ornamental tree variety improvement and breeding not only enhances the aesthetic qualities and adaptability of garden plants but also promotes the development of horticultural science and plant genetics. This progress provides scientific and technological support for the sustainable management and utilization of ornamental trees, helping to balance ecological, aesthetic, and economic benefits, and better meeting the public's pursuit of a quality living environment. With the continuous development and application of GWAS technology, we can expect that garden tree species will show richer diversity and stronger environmental adaptability in the future, making a greater contribution to the creation of livable and sustainable urban green space. 6 Challenges and Future Prospects 6.1 Challenges faced by GWAS in ornamental tree genetic research Although Genome-wide association studies (GWAS) have achieved significant results in ornamental tree genetic research, there are multiple challenges in practical applications. For example, obtaining reliable GWAS results relies on a large number of samples with diverse genetic backgrounds, but in ornamental trees, sample acquisition may be limited by factors such as seasonal changes, long growth cycles, and limited germplasm resources. As in the case of the Norway spruce breeding program, there is a large amount of phenotypic data available, but how to handle the high heterogeneity of this data remains a major challenge (Chen et al., 2021). The phenotypic expression of ornamental trees is influenced not only by genetic factors but also closely related to environmental conditions. Precisely separating and evaluating the specific effects of genetic and environmental factors on traits is a complex issue in GWAS research. Furthermore, many traits in ornamental trees, such as aesthetic traits and adaptive traits, are typically controlled by multiple genes and influenced by environmental factors, increasing the complexity of studying their genetic regulation mechanisms. Protecting the rare or locally endemic genetic resources in ornamental trees while making reasonable use of these resources for variety improvement and breeding is also an important challenge. These challenges need to be addressed through a combination of scientific methods and interdisciplinary collaboration to fully realize the potential of GWAS in ornamental tree genetic research. 6.2 Future prospects Facing the challenges in ornamental tree genetic research, future prospects are mainly focused on several key areas. On the one hand, improving the resolution of Genome-wide association studies (GWAS) is an important direction for development. This can be achieved by integrating more genetic and phenotypic data and adopting more advanced statistical methods to more accurately localize genes or genetic regions controlling traits. Secondly, multi-omics integrative analysis will become a research focus. By combining transcriptomics, proteomics, epigenetics, and other data, researchers can gain a deeper understanding of the genetic regulatory mechanisms underlying traits and unravel the interactions between gene expression, protein function, and epigenetic modifications. Furthermore, the application of precision breeding technologies, particularly the use of gene editing techniques such as CRISPR/Cas9, will enable precise modification of target genes in ornamental trees, facilitating trait improvement and increasing the efficiency and accuracy of breeding. Strengthening the conservation of ornamental tree genetic resources is also a key direction for future research. Establishing genetic resource databases and realizing the digitization and informatization of resource management can not only protect these
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