Two Additional Factors for Host Resistance to Net Blotch in Barley¹

Abstract

Synopsis Eight varieties, 6 resistant to net blotch and 2 susceptible, were used as parents in the genetic studies reported in this paper. Three genes for resistance—Pt1, Pt2, and Pt3—differentiated the six resistant varieties from the susceptible varieties, Atlas and Atlas 46. Pt1 and Pt2 were tightly linked with about 2.57% recombination; Pt3 was inberited independently of the linked genes. The genes for net b'otch resistance were inherited independently of the Hanna gene for mildew resistance carried by Atlas 46.

Genetics of host-pathogen interactions in the Pyrenophora teres f. teres (net form) – barley (Hordeum vulgare) pathosystem

“…One of the first studies on the genetic control of resistance to P. teres in barley was conducted in 1955 in the USA (Schaller, 1955). Since this time, many different sources of race-specific resistance (Mode & Schaller, 1958;Khan & Boyd, 1969;Bockelman, Sharp, & Eslick, 1977;Weiland, Steffenson, Cartwright, & Webster, 1998;Afanasenko, Makarova, & Zubkovich, 1999a) and race non-specific resistance (Arabi, Sarrafi, Barrault, & Albertini, 1990;Harabi, Cherif, & Slama, 1993) have been identified. In addition to these studies on the host, P. teres was characterised with respect to virulence on barley (Tekauz, 1990;Afanasenko, 2001).…”

Application of BARE-1 retrotransposon markers to the mapping of a major resistance gene for net blotch in barley

“…The results of classical genetic analyses indicate that resistance is controlled by 1±3 loci, depending on the barley accession and the net blotch isolate used for testing (Mode and Schaller 1958;Wilcoxson et al 1992;Douiyssi et al 1996;Ho et al 1996). The genetic background of the susceptible parent used in crosses and the infection environment both in¯uence the host resistance reaction (Khan 1969).…”

Mapping of genomic regions associated with net form of netblotch resistance in barley

“…Graner and A. Tekauz, unpublished data) and Pt1 syn. Pt.a/ Rpt1 and Rpt2c on chromosome 3H, have been reported (Schaller 1955;Mode and Schaller 1958;Khan and Boyd 1969a;Bockelman et al 1977;Wilcoxson et al 1992;. On chromosome 2HS, a QTL for resistance to net blotch of adult plants has been described (Pecchioni et al 1996;Steffenson et al 1996).…”

“…Identification of sources of resistance to NFNB and an understanding of their genetics are very important in developing resistant varieties (Jalli and Robinson 2000). NFNB resistance is due to either one or several genes and is dependent upon the source of resistance, plant development stage (seedling or adult), and the pathotype used for testing (Mode and Schaller 1958;Wilcoxson et al 1992;Steffenson et al 1996). At adult plant stages, 7-12 quantitative trait loci (QTLs) associated with net blotch resistance have been identified, located on all barley chromosomes except 5H (Steffenson et al 1996;Richter et al 1998).…”