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- Title
Genetic analysis reveals a dominant S locus and an S suppressor locus in natural self-compatible Brassica napus.
- Authors
Chaozhi Ma; Chunyan Li; Yongqiang Tan; Wei Tang; Jianfeng Zhang; Changbin Gao; Tingdong Fu
- Abstract
A self-incompatible (SI) line, S-1300, and its maintainer 97-wen135, a self-compatible (SC) line, were used to study the inheritance of maintenance for self-incompatibility in B. napus. The ratio of SI plants to SC plants from S-1300 × 97-wen135 F2 and (S-1300 × 97-wen135) × 97-wen135 was 346:260 and 249:232, fitting the expected ratio of 9:7 and 1:1, respectively. Based on these observations, here we propose a genetic model in which two independent loci, S locus and S suppressor locus ( sp), are predicted to control the inheritance of maintenance for self-incompatibility in B. napus. The genotypes of S-1300 and 97-wen135 are S 1300 S 1300 sp 1300 sp 1300 and S 135 S 135 sp 135 sp 135, respectively. S 135 is dominant to S 1300, but coexistence of sp 1300 and sp 135 fails to suppress S locus. Both S 1300 and S 135 can be suppressed by sp 135, while sp 1300 can suppress S 135 but not S 1300. The model contains two characteristics: that a dominant S locus exists in self-compatible B. napus, and that co-suppression will occur when sp loci are heterozygous. The model has been validated by the segregation of S phenotypes in the (S-1300 × 97-wen135) × S-1300, the progenies of SC S-1300 × 97-wen135 F2 plants and DH population developed from S-1300 × 97-wen135 F1. This is the first study to report co-suppression of S suppressor loci in B. napus. The genetic model will be very useful for developing molecular markers linked to maintenance for self-incompatibility and for dissecting the mechanism of SI/SC in B. napus.
- Subjects
RUTABAGA; PLANT development; PLANT genetics; GENETIC polymorphisms; GENOTYPE-environment interaction
- Publication
Euphytica, 2009, Vol 166, Issue 1, p123
- ISSN
0014-2336
- Publication type
Article
- DOI
10.1007/s10681-008-9846-7