A total of 512 pairs of SSR primers evenly distributed
on 12 chromosomes were used to screen polymorphism
between the mutant flo7 and Nanjing 11. The seeds
obtained from F1 plants of flo7 × Nanjing 11 combination
with floury endosperm (equivalent of F2 recessive
separated plants) were selected, and then germinated,
further DNAs of the seedling leaves were extracted for
gene mapping of Flo7. Firstly, 46 floury endosperm
separated plants were selected to linkage analysis of
mutation gene Flo7, which was aimed to preliminary
mapping target gene. Thereafter, 11 polymorphic SSR
and InDel markers (Table 1) located in the critical
genomic region were identified, and these, along with
the most closely linked SSRs identified in the primary
screen, were used to genotype a population of 1 720
F2 seedlings to obtain a localized fine-scale genetic
map. Each 10 μL PCR contained 1 μL of template DNA,
1 μL of 10 × PCR buffer, 0.1 μL of dNTPs (10 μmol/L),
1 μL of primers (10 μmol/L) and 0.1 U Taq DNA
polymerase. The amplification protocol comprised an
initial denaturation (95 °C for 3 min), followed by 35
cycles of 95 °C for 30 s, 55 °C for 30 s and 72 °C for
A total of 512 pairs of SSR primers evenly distributedon 12 chromosomes were used to screen polymorphismbetween the mutant flo7 and Nanjing 11. The seedsobtained from F1 plants of flo7 × Nanjing 11 combinationwith floury endosperm (equivalent of F2 recessiveseparated plants) were selected, and then germinated,further DNAs of the seedling leaves were extracted forgene mapping of Flo7. Firstly, 46 floury endospermseparated plants were selected to linkage analysis ofmutation gene Flo7, which was aimed to preliminarymapping target gene. Thereafter, 11 polymorphic SSRand InDel markers (Table 1) located in the criticalgenomic region were identified, and these, along withthe most closely linked SSRs identified in the primaryscreen, were used to genotype a population of 1 720F2 seedlings to obtain a localized fine-scale geneticmap. Each 10 μL PCR contained 1 μL of template DNA,1 μL of 10 × PCR buffer, 0.1 μL of dNTPs (10 μmol/L),1 μL of primers (10 μmol/L) and 0.1 U Taq DNApolymerase. The amplification protocol comprised aninitial denaturation (95 °C for 3 min), followed by 35cycles of 95 °C for 30 s, 55 °C for 30 s and 72 °C for
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