New sources of resistance to iSoybean mosaic virus/i in soybean.

摘要

Soybean mosaic virus (SMV) is one of the most prevalent viral diseases in all major soybean-growing areas worldwide. Seven strain groups of SMV (G1-G7) and three resistance loci (Rsv1, Rsv3, and Rsv4) have been identified in soybean (Glycine max). In our initial study, 209 soybean genotypes were screened for reactions to G1 and G7, 129 of which were resistant to one or two strains. The objective of this research was to screen 127 genotypes with six SMV strains and differentiate specific alleles for resistance in these genotypes. The results demonstrated that 84 genotypes carry alleles at the Rsv1 locus: 42 with Rsv1-y, 5 with Rsv1, 19 with Rsv1-k, 8 with Rsv1-t, 8 with Rsv1-r, 1 with Rsv1-n, and 1 with Rsv1-h. Sixteen genotypes were identified to presumably carry new alleles for SMV resistance at Rsv1, Rsv3, or Rsv4. Nine of these 16 genotypes ('Kosuzu', 'Suzumaru', PI 398877, 'Jitsuka', 'Clifford', and 'Tousan 65', 'Corsica', PI 61944, and PI 61947) may carry new alleles at the Rsv1 locus based on the comparison of their differential reaction patterns against the nine reported Rsv1 alleles. Two genotypes (PI 339870 and PI 399091) may carry new resistance alleles at the Rsv3 locus. Five genotypes (KAERI-GNT-220-7, PI 398593, PI 438307, 'Rhosa', and 'Beeson') may carry new alleles at the Rsv4 locus. In addition, 18 genotypes were resistant to all six strains tested and may carry Rsv1-h, Rsv4, Rsv1Rsv3, Rsv1Rsv4, or Rsv3Rsv4. Research is underway to confirm the new SMV resistance alleles through genetic and molecular approaches.