In:
Plant Genetic Resources, Cambridge University Press (CUP), Vol. 9, No. 2 ( 2011-07), p. 309-312
Abstract:
New races of Phytophthora infestans rapidly defeat potato late blight (LB) resistance based on Solanum demissum germplasm, and breeders search for new sources of durable LB resistance. We developed and verified six sequence characterized amplified region markers recognizing the race-specific genes R1 and R3 of S. demissum and the broad-spectrum resistance gene RB of S. bulbocastanum and the germplasms of these species and used them to screen 209 accessions of 21 wild Solanum species. In addition to S . demissum , homologues of R1 and R3 were found in several species of series Demissa, Longipedicellata and diploid Tuberosa ; R3 homologues were also detected in S. bulbocastanum, S. cardiophyllum and S. ehrenbergii. The RB homologues were found in a wider range of Solanum species. The markers of R1 and R3 genes reliably discerned between germplasms of S. tuberosum ssp. tuberosum and wild sources of LB resistance. Following introgression, the species-specific markers of demissum and bulbocastanum germplasm were rapidly lost, whereas the markers of R1 and R3 genes lasted through several meiotic generations and were maintained at high frequencies in modern potato cultivars. The presence of these markers in demissoid potato cultivars was significantly associated with LB resistance, presuming that both genes contribute to overall defence response.
Type of Medium:
Online Resource
ISSN:
1479-2621
,
1479-263X
DOI:
10.1017/S1479262111000347
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2011
detail.hit.zdb_id:
2180556-8
SSG:
12
Permalink
