B.Microsatellite Polymorphism
From the 29 primers selected, distinguishable alleles
ranging from 2-15 were detected in the clones evaluated per
primer. This revealed polymorphism at individual loci (Table
III). Overall, the said 29 primers detected a total of 3644
genotypes from the 187 clones evaluated. Specifically, primer
CGR 6987 detected fifteen (15) alleles from the 187 Durian
samples evaluated; followed by primer CGR 5130 which
identified fourteen (14) alleles. On the other hand, primer
DZG01 was able to detect only two (2) distinguishable alleles.
Table IV also shows the primers that generated unique
genotypes. Different genotypes were produced based on the
unique alleles detected by the said informative SSR primers
selected.
Primers CGR 6987 identified 56 clones with unique
genotypes; primer CGR 5130 had detected 48 clones with
unique genotypes; primer DPL 0912 detected 45 clones with
unique genotypes; primer SHIN 1621 detected 37 clones with
unique genotypes; primer CGR 5030 identified 36 clones with
unique genotypes; primer CGR5091 identified 24 clones with
unique genotypes; Primer CGR 5117 detected 23 clones with
unique genotypes; primer CGR 6729 detected 22 clones with
unique genotypes; primer CGR5141 identified 20 clones with
unique genotypes; primers DZC01 and DPL 0790 detected 19
clones with unique genotypes; primers CGR 5334 and SHIN
1574 identified 18 clones with unique genotypes; primers
CGR 5110 and CGR 5238 detected 16 clones with unique
genotypes. While primer CGR 5018 identified 14 clones with
unique alleles. Moreover, primer DPL 0911 detected 11 clones
with unique genotypes; primer CGR 5136 detected 10 clones
with unique genotypes; primer DZCAG01 detected 9 unique
clones; primer DZA01 and CGR 5028 detected 7 unique
alleles; CGR 6723 identified 3 unique alleles; primer DPL
0725 detected 2 clones with unique alleles. Primer DZGCC01
detected 1 clone each with different genotype unique for the
specific clone. A detailed DNA profile of the different clones
detected by the 29 primers had been generated. It is interesting
to note that DZGCC01 generated unique and specific alleles
for a clone collected from Francisco Sasing, Calinan, Davao
City DPL 0725 on the other hand is unique and specific for a
native variety collected from Kulaman, Sultan Kudarat. These
primers therefore, can be used as markers for authenticating
and identifying the said clones. Thus, the results obtained can
assist BPI in their routine testing for the certification purpose.
Fig. 1 shows a sample of the genetic profile of the different
cultivars as detected by the primer DPL0912. A closer
inspection of the figure shows that those bands represented by
the same color have the same genetic profile while those
represented by different colors are different from each other
hence they can be used to distinguish one clone over the other
clones.