SOYBEAN CYST NEMATODE RESISTANCE DERIVED FROM <I>GLYCINE TOMENTELLA</I> IN AMPHIPLOID (<I>G. MAX</I> x <I>G. TOMENTELLA</I> ) HYBRID LINES

Abstract

Bauer, S., T. Hymowitz, and G. R. Noel. 2007. Soybean cyst nematode resistance derived from Glycine tomentella in amphiploid (G. max x G. tomentella) hybrid lines. Nematropica 37:277-285. Soybean cyst nematode, Heterodera glycines, is an important yield limiting pest in major soybean production areas throughout the world. The primary component of H. glycines management is the planting of resistant cultivars in rotation with nonhost crops. Several genes that confer resistance to H. glycines have been identified, but populations of H. glycines that can overcome all of the genes are known. In order to find additional resistance genes, 491 accessions of the perennial soybeans G. argyrea, G. canescens, G. clandestina, G. curvata, G. cyrtoloba, G. dolichocarpa, G. falcata, G. latifolia, G. microphylla, G. pindanica, G. tabicina, and G. tomentella were evaluated for resistance to H. glycines HG Type 0. All species, except G. curvata and G. pindanica, had at least one accession that was immune to H. glycines. Glycine tomentella (accession PI 483218, 2n = 78), which was immune to H. glycines, was used to introgress resistance into intersubgeneric hybrids of G. max (cv. Altona) and this G. tomentella accession. Amphiploid hybrid lines (2n= 118) resulting from this hybridization were backcrossed to G. max (cv. Clark 63) to develop fertile lines (2n= 40). Fifty clones were developed, and when challenged with H. glycines HG Type 0, the clones also were immune to the nematode.