Editorial: Applications of fast breeding technologies in crop improvement and functional genomics study

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Applications of fast breeding technologies in crop improvement and functional genomics study New crop varieties are increasingly crucial to agriculture production, and their development depends on the exploration and application of key germplasm resources, often referred to as seed chips.Conventional breeding strategies are time-consuming, but recent advances in fast breeding technologies have significantly accelerated the process of crop trait modification, gene mapping, and functional genomics studies.These technologies include molecular selection, molecular mapping of genes, haploid induction, and genome editing mediated by CRISPR/Cas9 (Figure 1) (Gao, 2021).CRISPR/Cas9 has been applied to rapidly modify important crop traits such as disease resistance, quality, maturity, grain weight, sterility, and pre-harvest sprouting tolerance (Li et al., 2024).Particularly, new haploid inducer lines have been created in maize, rice, Arabidopsis, wheat, alfalfa, foxtail millet, tomato, Brassica oleracea, and soybean by editing MTL (PLA1/NLD), DMP, and PLD3 genes via CRISPR/Cas9 to produce haploid grains directly (Qi et al., 2023;Tang et al., 2023;Qu et al., 2024).Additionally, new types of molecular markers have been developed and used to trace agronomically important traits in breeding programs and locate target genes on chromosomes for gene cloning alongside generally employed makers such as simple sequence repeat (SSR), single-nucleotide polymorphism (SNP), and expressed sequence tags (EST) (Rasheed et al., 2017;Hao et al., 2020).Using these techniques, the period for breeding new crop varieties and germplasms can be greatly shortened.Therefore, we organized this Research Topic to collectively report the achievements in the applications of fast breeding technologies in genetic improvement and functional genomic studies in various plants.Since the initiation of this Research Topic in June 2023, we have received 39 manuscripts on the development, application, and summarization of fast breeding technologies in plants.Finally, 15 papers have been published in this Research Topic after careful evaluation.Melon and potato are important fruit and vegetable crops worldwide, and their genetic improvement and resource expansion can be efficiently promoted by the exploration of quantitative trait loci (QTL) and molecular markers.In the melon paper, the resistance Frontiers in Plant Science frontiersin.

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