All the EST-SSR and SSR primer pairs were screened with the parental samples in order to identify the potentially polymorphic markers, used to genotype with 100 F 1 progenies. The PCR reactions for EST-SSR analysis were performed according to Tangphatsornruang et al. (2008). Briefly, the amplification reactions in 20 ll consisted of 50 ng of DNA template, 10 pmol of each forward and reverse primers, 200 lM dNTP, 19 PCR Buffer, 1.5 mM
MgCl2 , and 1.5 U Taq DNA polymerase. The PCR conditions consisted of 1 cycle of 94_C for 1 min,
followed by 30 cycles of 94_C for 45 s, annealing temperature for 1 min and 72_C for 1 min, and 1 cycle of 72_C for 5 min. The PCR reactions of SSR analysis were performed as described in Kunkeaw et al. (2010)
in 15 ll reaction volumes containing 25 ng of genomic DNA, 0.06 lM of each primer, 0.2 mM dNTPs , and 1 U
Taq DNA polymerase (Promega). PCR was accomplished by 2 min at 94_C, followed by 30 cycles of
45 s at primer annealing temperature, and 1 min at 72_C for 30 cycles. The PCR products were analyzed by 5% (w/v) denaturing polyacrylamide gel electrophoresis and visualized by silver staining (Benbouza
et al. 2006). Sequences of EST primers used in this study are shown in Table 1. (Promega), 19 PCR Buffer, 1.5 mM MgCl2