Judelson, H.S. (1996) Chromosomal heteromorphism linked to the mating type locus of the oomycetePhytophthora infestans. Molecular and General Genetics, 252 (1-2). pp. 15-161.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
- Published Version
Restricted to ICRISAT researchers only |
Abstract
The mating type locus of the oomycete,Phytophthora infestans, is embedded in a region of DNA that displays distorted and non-Mendelian segregation. By using DNA probes linked to the mating type locus to genetically and physically characterize that region, a large zone of chromosomal heteromorphism was detected. LocusS1 was shown to represent a tandemly repeated array of DNA that was typically present in a hemizygous state in A1 isolates while being absent from A2 isolates. The analysis of the parents and progeny of seven crosses indicated that the tandem array was linked in cis to the A1-determining allele of the mating type locus. A worldwide survey of genotypically diverse field isolates ofP. infestans indicated thatS1 was present in each of 48 isolates of the A1 mating type that were tested, but was absent in 46 of 47 A2 strains. Physical analysis ofS1 indicated that the tandemly repeated DNA sequence spanned about 300 kb and had evolved from a 1.35-kb monomer. Internal deletions occurred withinS1 during sexual propagation. This and other mutations apparently contributed to a high degree of polymorphism within theS1 array
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Potato late blight; Population genetics; Sex chromosome; Tandem repeat |
| Author Affiliation: | Department of Plant Pathology, University of California, 92521, Riverside, CA, USA |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | Other Crops |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 07 May 2014 03:09 |
| Last Modified: | 07 May 2014 03:09 |
| Official URL: | http://dx.doi.org/10.1007/BF02173215 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/13140 |
Actions (login required)
 |
View Item |
