[Identification of a repetitive sequence element for DNA fingerprinting in Phytophthora sojae].
OBJECTIVE
Establishment of DNA fingerprinting in Phytophthora sojae and an analysis of genetic relationship of Heilongjiang and Xinjiang populations.


METHODS
Bioinformatics tools were used to search repetitive sequences in P. sojae and Southern blot analysis was employed for DNA fingerprinting analysis of P. sojae populations from Heilongjiang and Xinjiang using the identified repetitive sequence.


RESULTS
A moderately repetitive sequence was identified and designated as PS1227. Southern blot analysis indicated 34 distinct bands ranging in size from 1.5 kb-23 kb, of which 21 were polymorphic among 49 isolates examined. Analysis of single-zoospore progenies showed that the PS1227 fingerprint pattern was mitotically stable. DNA fingerprinting showed that the P. sojae isolates HP4002, SY6 and GJ0105 of Heilongjiang are genetically identical to DW303, 71228 and 71222 of Xinjiang, respectively.


CONCLUSIONS
A moderately repetitive sequence designated PS1227 which will be useful for epidemiology and population biology studies of P. sojae was obtained, and a PS1227-based DNA fingerprinting analysis provided molecular evidence that P. sojae in Xinjiang was likely introduced from Heilongjiang.
Yin
Lihua
L
College of Plant Protection, Northwest A & F University, Yangling, 712100, China. yinlhua@gmail.com
Wang
Qinhu
Q
Ning
Feng
F
Zhu
Xiaoying
X
Zuo
Yuhu
Y
Shan
Weixing
W
D000636:Aminosalicylic Acids / Q000494:pharmacology; D015139:Blotting, Southern / Q000379:methods; D002874:Chromosome Mapping; D016172:DNA Fingerprinting / Q000379:methods*; D004271:DNA, Fungal / Q000032:analysis; D014644:Genetic Variation; D016681:Genome, Fungal / Q000235:genetics*; D016533:Mycological Typing Techniques / Q000379:methods*; D010838:Phytophthora / Q000145:classification* / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics*; D013045:Species Specificity; D020080:Tandem Repeat Sequences / Q000235:genetics*
D000636:Aminosalicylic Acids; D004271:DNA, Fungal; C098612:KB 23