In:
Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 98, No. 18 ( 2001-08-28), p. 10493-10498
Abstract:
Resistance gene Cf-9 of cultivated tomato ( Lycopersicon esculentum ) confers recognition of the AVR9 elicitor protein of the fungal pathogen Cladosporium fulvum . The Cf-9 locus, containing Cf-9 and four homologs ( Hcr9 s), originates from Lycopersicon pimpinellifolium ( Lp ). We examined naturally occurring polymorphism in Hcr9 s that confer AVR9 recognition in the Lp population. AVR9 recognition occurs frequently throughout this population. In addition to Cf-9, we discovered a second gene in Lp , designated 9DC, which also confers AVR9 recognition. Compared with Cf-9 , 9DC is more polymorphic, occurs more frequently, and is more widely spread throughout the Lp population, suggesting that 9DC is older than Cf-9 . The sequences of Cf-9 and 9DC suggest that Cf-9 evolved from 9DC by intragenic recombination between 9DC and another Hcr9. The fact that the 9DC and Cf-9 proteins differ in 61 aa residues, and both mediate recognition of AVR9, shows that in nature Hcr9 proteins with the same recognitional specificity can vary significantly.
Type of Medium:
Online Resource
ISSN:
0027-8424
,
1091-6490
DOI:
10.1073/pnas.181241798
Language:
English
Publisher:
Proceedings of the National Academy of Sciences
Publication Date:
2001
detail.hit.zdb_id:
209104-5
detail.hit.zdb_id:
1461794-8
SSG:
11
SSG:
12
