Garcia Jorge, Ulloa Mauricio, Hutmacher Robert B, Ellis Margaret L
Department of Plant Science, California State University, Fresno, CA, 93740, USA.
Cropping Systems Research Lab, Plant Stress and Germplasm Development Research, United States Department of Agriculture-Agricultural Research Service, Plains Area, Lubbock, TX, 79415, USA.
BMC Res Notes. 2025 Mar 14;18(1):113. doi: 10.1186/s13104-025-07161-y.
The fungus Rhizoctonia solani is an important seedling pathogen to many plant hosts including cotton (Gossypium). For multiple annual crops there have been relatively few screenings of germplasm conducted to identify potential sources of resistance to R. solani, and for cotton we have not been able to identify any recent germplasm screenings for resistance to this seedling pathogen. Therefore, the objective of this study was to screen historical as well as more recently developed Upland (Gossypium hirsutum L.) and Pima (Gossypium barbadense L.) cotton germplasm for resistance/susceptibility to R. solani.
The results of the R. solani screening found no significant differences among 85 Upland and 10 Pima cotton genotypes, which were all similarly susceptible to R. solani based on data for root rot and fresh root weight. While Upland and Pima cotton make up the majority of cotton grown worldwide, the lack of resistance identified in both historical and newer Upland and Pima germplasm suggests a pressing need for further exploration and selection of novel sources of resistance within the vast genetic diversity of different domesticated and wild cotton species.
茄丝核菌是包括棉花（棉属）在内的许多植物寄主的重要幼苗病原菌。对于多种一年生作物，为鉴定对茄丝核菌的潜在抗性来源而进行的种质筛选相对较少，而对于棉花，我们尚未发现近期有针对这种幼苗病原菌抗性的种质筛选。因此，本研究的目的是筛选历史悠久以及最近培育的陆地棉（陆地棉）和皮马棉（海岛棉）种质对茄丝核菌的抗性/敏感性。
茄丝核菌筛选结果表明，85个陆地棉基因型和10个皮马棉基因型之间没有显著差异，根据根腐病数据和鲜根重量，它们对茄丝核菌的敏感性相似。虽然陆地棉和皮马棉占全球棉花种植的大部分，但在历史悠久和较新的陆地棉和皮马棉种质中均未发现抗性，这表明迫切需要在不同驯化和野生棉种的巨大遗传多样性中进一步探索和选择新的抗性来源。
