Newly Developed Soybean JTN-4307 Has Resistance to Multiple Pathogens.

In the United States, combined annual yield losses in soybean [Glycine max (L.) Merr. ] caused by soybean cyst nematode (SCN), charcoal rot (CR ), and Frogeye leaf spot (FLS)are estimated to be more than $1 billion. Resistant cultivars have stabilized the losses for SCN, however, over time, variable nematode populations have adapted to them. Soybean cultivars with combined resistance to SCN, CR, and FLS are not available. We have developed a soybean line, JTN-4307, with resistance to multiple pathogens with good yield potential. Progenies of the crosses (S97-1688 X V94-0198) were advanced using bulk row method. Single plant selections from F₄ generation were planted to rows in F₅ during 2005. F_5:6 progenies were bioassayed in the greenhouse for nematode populations using established methods to identify resistant plants. Resistance was confirmed in marker assisted selection using SSR markers specific to nematode resistance. A line resistant to SCN races 2, 3, and 14 was also tested for its reaction to CR and FLS using available methods, and was found moderately resistant to CR and confirmed to have the Rcs3 gene using SSR markers for its resistance to FLS.  In USDA Southern Uniform Tests JTN-4307 was found to be also resistant to southern root-knot nematode, reniform nematode, and stem canker. This line has moderate resistance to sudden death syndrome. It is a group V soybean, determinate in growth habit with purple flowers, tawny pubescence, and black hilum. Seed yields range from 2865 to 3389 Kg/Ha. With resistance to multiple pathogens, JTN-4307 is an excellent parent material in crosses to develop more desirable cultivars. Growers may also directly plant JTN-4307 where diseases are a more serious problem.