The extraction processes were carried out as recommended by the manufacturer.
Templates were tested further for concentration and purity with a spectrophotometer (Eppendorf, Germany).
The primer sequences used in the present work were previously reported by .
The primers for the first-round PCR were WSSV1 out: 5 ATCATGGCTGCTTCA CAGAC 3 and WSSV2 out: 5 GGCTGGAGAGGACAAGACAT 3 and for the second-round of amplification (the inner primers)WSSV1 in: 5 TCT
TCATCAGAT GCTACTGC 3 and WSSV2 in: 5 TAACGCTATCCAGTATCACG 3.
The expected size of the amplified fragment was 982 bp for the first-round PCR reaction and 570 bp for the second-round
PCR.
The PCR reactions were carried out in a final volume of 30 l
containing 5 ltemplate DNA, 3 l 10× STR buffer (including dNTP,
Mg2+, Promega, USA), 0.2 l Taq DNA polymerase, 2 l primers mix
(2 M) and 19.8 l sterile water. In the first-round PCR, 3 ng of target DNA were used. For the second-round PCR, 1 l of a 1:100
dilution of the first-round PCR product was used as target DNA.
Amplifications were performed starting with a 4 min denaturation
step at 95 ◦C, followed by 40 cycles of denaturation at 95 ◦C
for 1 min, annealing at 55 ◦C for 30 s, extension at 72 ◦C for 1 min,
and final extension at 72 ◦C for 5 min. The amplified products were
detected by using a 1.5% agarose gel followed by UV visualization
after ethidium bromide staining.
2.4. S