SSRS banana
description
Transcript of SSRS banana
-
FUNPEC-RP www.funpecrp.com.brGenetics and Molecular Research 11 (2): 1093-1098 (2012)
Research Note
New microsatellite markers for bananas (Musa spp)
E.P. Amorim1, P.H. Silva2, C.F. Ferreira1, V.B.O. Amorim1, V.J. Santos3, A.D. Vilarinhos1, C.M.R. Santos4, M.T. Souza Jnior5 and R.N.G. Miller6
1Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, Brasil2Universidade Federal de Lavras, Lavras, MG, Brasil3Universidade Federal do Recncavo da Bahia, Cruz das Almas, BA, Brasil4Embrapa Recursos Genticos e Biotecnologia, Braslia, DF, Brasil5Embrapa Agroenergia, Braslia, DF, Brasil6Departamento de Biologia Celular, Instituto de Cincias Biolgicas, Universidade de Braslia, Braslia, DF, Brasil
Corresponding author: E.P. AmorimE-mail: [email protected]
Genet. Mol. Res. 11 (2): 1093-1098 (2012)Received September 12, 2011Accepted January 16, 2012Published April 27, 2012DOI http://dx.doi.org/10.4238/2012.April.27.8
ABSTRACT. Thirty-four microsatellite markers (SSRs) were identified in EST and BAC clones from Musa acuminata burmannicoides var. Calcutta 4 and validated in 22 Musa genotypes from the Banana Germplasm Bank of Embrapa-CNPMF, which includes wild and improved diploids. The number of alleles per locus ranged from 2 to 14. The markers were considered highly informative based on their polymorphism information content values; more than 50% were above 0.5. These SSRs will be useful for banana breeding programs, for studies of genetic diversity, germplasm characterization and selection, development of saturated genetic linkage maps, and marker assisted selection.
Key words: Genetic breeding; Microsatellites; Primer validation;Musa spp
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E.P. Amorim et al.
INTRODUCTION
Bananas (Musa spp) are grown in more than 120 tropical and subtropical countries, mainly by small farmers. In 2010, the total harvested area and fruit production were approxi-mately 4.7 million hectares and 102 million tons, respectively (FAO, 2012). Such numbers indicate the importance of bananas as a strong commodity, playing key economic and social roles in many countries producing bananas worldwide.
Banana breeding programs are currently focused on the introgression of diverse traits that range from disease resistance/tolerance to yield and fruit quality (Heslop-Harrison and Shawarzacher, 2007). Molecular genetic studies are of fundamental importance for increas-ing our knowledge base and resources for accelerated genetic improvement of the crop, by allowing the analysis of genetic diversity, construction of genetic linkage maps, and quan-titative trait locus mapping of markers for alleles linked to resistance to biotic and abiotic stresses of particular importance. The availability of reliable and robust molecular markers such as simple sequence repeat (SSRs) might contribute to the acceleration of Musa breeding programs.
Although many Musa SSRs have been developed thus far by using a number of differ-ent strategies (Jarret et al., 1994; Crouch et al., 1997; Lagoda et al., 1998; Creste et al., 2003, 2006; Wang et al., 2008; Miller et al., 2010), the number of SSR loci available for genetic analysis is still limited, with many more validated and polymorphic SSRs required (Creste et al., 2004; Wang et al., 2009).
MATERIAL AND METHODS
A total of 52 SSR primer pairs were developed in this study from Musa acumina-ta expressed sequence tag and bacterial artificial chromosome clone consensus sequence data available in the DATA Musa database (http://bioinformatics.cenargen.embrapa.br/musagene/tiki-index.php?page=DATAMUSA) (Togawa et al., 2010). For this, sequences were analyzed using an in-house bioinformatics pipeline that detects microsatellite loci on the basis of a PERL script that scans for imperfect repeat SSRs using the scan-for-matches program (Dsouza et al., 1997). A maximum of 5 primer sets per SSR locus were designed using Primer3 (Rozen and Skaletsky, 2000). Optimization of polymerase chain reaction (PCR) amplification conditions was performed using the Fast PCR professional 5.2 software (http://www.biocenter.helsinki.fi/bi/programs/fastpcr.htm).
Microsatellites were then optimized and validated using M. acuminata accessions ranging from wild to improved diploids. For this, plantlets of 11 wild banana diploids (Bur-manica, Calcutta-4, Microcarpa, Berlin, Lidi, Khai Nai On, Nyarma Yik, Jari Buaya, Raja Uter, Sowmuk, and Tjau Lagada) and 11 improved diploids (017041-01, SH32-63, 042079-06, 013018-01, 003023-03, 013004-06, 001016-01, 091079-03, F2P2, 003115-Plant-1, and 15-Plant-2) from the Musa germplasm bank maintained at Embrapa Cassava and Fruits Research Centre (www.cnpmf.embrapa.br) were selected. These 22 diploids were chosen on the basis of agronomical characteristics and disease resistance.
Genomic DNA was extracted from young leaves of the wild and improved banana diploids by using the cetyltrimethylammonium bromide (CTAB) method proposed by Doyle
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Musa spp microsatellite primer validation
and Doyle (1990). PCRs contained 30 ng DNA, 1.5 mM MgCl2, 100 M each dNTPs, 0.2 mM each primer, and 0.75 U Taq polymerase in 10X buffer (Biosystems) in a final reaction volume of 15 L. Amplifications were carried out using a BIORAD MyCycler-Thermal Cycler with the following amplification program: 94C for 3 min, followed by 30 cycles of 94C for 40 s, 55C for 40 s (annealing temperature modified according to the primer used), and 72C for 1 min. A final polymerase extension step at 72C for 4 min was also included, followed by a final incubation at 10C. PCR optimization in-cluded identification of the optimal MgCl2 concentrations and annealing temperatures by using 3 different protocols. Amplification products were electrophoresed on 6% de-naturing polyacrylamide gels and silver stained according to the protocol described by Creste et al. (2001). Allele size was estimated using a 50-bp ladder molecular size stan-dard (Invitrogen).
RESULTS AND DISCUSSION
SSR markers combine several features of an ideal genetic marker, owing to their abundance and widespread dispersal in genomes, hypervariability, co-dominant nature, ac-cessibility, reliability, and ease of interpretation (Gaudeul et al., 2004). Therefore, assess-ment of Musa genetic variability solely by using SSR markers continues to be widely used (e.g., Amorim et al., 2008; Jesus et al., 2009).
Of the 52 primer pairs tested in this study, 1 was monomorphic (data not shown), 3 did not yield any PCR product, and 14 required adjustment in PCR conditions. Thirty-four SSR primer combinations produced polymorphic DNA amplification products and were validated as being useful markers for genetic studies in Musa spp (Table 1).
The number of alleles per primer varied from 2 to 14, with an average number of 5.73. Markers CNPMF-1, -9, -15, -21, -24, -25, and -56 presented the lowest number of alleles (2) and marker CNMPF-45 yielded the highest number of alleles (14). This CNPMF-series of SSR markers was classified according to their repeat motifs. The mi-crosatellites were compared with the NCBI public database (http://www.ncbi.nih.gov/BLAST/) using the BLASTx-Swissprot option. A cut-off E-value of
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FUNPEC-RP www.funpecrp.com.brGenetics and Molecular Research 11 (2): 1093-1098 (2012)
E.P. Amorim et al.
Nam
e G
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Lo
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Prim
er se
quen
ce (5
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Rep
eat
NA
bp
Ta
HE
HO
PIC
LD
H
WE
B
LAST
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rot
E-va
lue
N
o.
mot
if
(P
val
ue)
(5%
Pro
b.)
CN
PMF-
1 M
aAES
_ALL
0897
M
abC
NPM
FEst
-1
F: T
GAT
GC
ATTG
GAT
GAT
CTC
G
(TG
G) 7
2 33
6 55
0.
0868
0.
0909
0.
0830
1.
0000
1.
0000
Pe
ctin
este
rase
1e
-05
R
: AA
AA
CA
CA
CC
AA
CTC
CAT
CC
C
in
hibi
tor
CN
PMF-
4 M
aAES
_ALL
1578
M
abC
NPM
FEst
-4
F: T
CTG
TAC
GTC
TGC
CTT
GC
AC
(G
T)7
4 16
6 54
0.
6927
0.
8095
0.
6305
0.
0010
0.
6200
U
nkno
wn
-
R: T
GC
AG
GA
GG
TGG
ATC
CAT
AG
CN
PMF-
5 M
aAES
_ALL
0329
M
abC
NPM
FEst
-5
F: C
CC
TGA
CA
GAT
CC
TTTG
TGG
(G
AA
) 8 9
205
54
0.83
16
0.59
09
0.81
43
0.00
80
0.0
000*
U
nkno
wn
-
R: G
GA
GA
CTT
CC
AC
CTT
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CG
CN
PMF-
8 M
aAES
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FEst
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GA
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GA
GA
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AA
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166
55
0.52
48
0.36
3 0.
4660
0.
3950
0
.000
0*
Unk
now
n -
R
: ATC
CA
CA
ATC
CG
ATC
AG
CTC
CN
PMF-
9 M
aAES
_ALL
0697
M
abC
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FEst
-9
F: C
CTT
CAT
CAT
CAT
CA
CG
GC
(G
AA
) 6 2
244
54
0.49
65
0.75
00
0.40
80
0.53
90
0.31
50
Unk
now
n -
R
: AC
CA
CG
AC
CTC
CTC
CTC
TTC
CN
PMF-
10
MaA
ES_A
LL15
91
Mab
CN
PMFE
st-1
0 F:
CA
CAT
CA
CA
CG
CTC
TGC
TTC
(C
CA
) 7 6
288
54
0.63
22
0.77
27
0.53
71
0.07
70
0.77
50
Unk
own
-
R: T
TTTT
CG
GC
TGAT
CC
AAT
TCC
NPM
F-12
M
aAES
_ALL
1148
M
abC
NPM
FEst
-12
F: C
AA
AG
TTTG
AA
AG
GG
AG
GG
G
(CC
A) 6
3 18
9 58
0.
4845
0.
6364
0.
4362
0.
0500
0.
2320
ps
a2 p
repr
otei
n 3e
-22
R
: CTC
GG
AC
CA
CTA
GC
TTC
CTG
CN
PMF-
13
MaA
ES_A
LL15
41
Mab
CN
PMFE
st-1
3 F:
GG
GAT
GG
CG
CA
CTT
CTT
C
(CA
A) 6
5 33
1 54
0.
6725
0.
8636
0.
6222
0.
1980
0
.002
0*
Unk
won
-
R
: AAT
CC
GG
GTT
GTA
AG
GA
AC
CC
NPM
F-14
M
aAES
_ALL
0052
M
abC
NPM
FEst
-14
F: C
ATC
GA
GG
ATG
CA
CAT
CA
AG
(C
T)13
9
236
54
0.82
13
0.86
36
0.80
00
0.00
60
0.06
30
Ferr
edox
in-
8e-5
7
R: C
CA
AA
AG
AG
CC
AC
GAT
TCA
G
de
pend
ent
gl
utam
ate
sy
ntha
seC
NPM
F-15
M
aAES
_ALL
0088
M
abC
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FEst
-15
F: T
GC
TGC
GAT
TCTA
CTC
ATC
G
(CT)
6 2
302
56
0.26
04
0.30
77
0.22
65
0.92
80
1.0
00
Ubi
quiti
n 2
e-10
1
R: T
GC
CC
TCC
TTG
TCC
TGTA
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F-16
M
aAES
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0125
M
abC
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F: T
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CTC
CC
GG
TTTC
(C
T)5
3 21
6 56
0.
5800
0.
2667
0.
4887
0.
0490
0
.008
0*
Unk
own
-
R: G
TCTG
CTG
CTC
TATC
CC
GA
GC
NPM
F-19
M
aAES
_ALL
0167
M
abC
NPM
FEst
-19
F: G
TGTT
CG
AG
AG
CTT
TCA
GC
C
(CT)
8 7
196
54
0.66
22
0.63
64
0.62
47
0.05
80
0.0
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O
xyge
n-ev
olvi
ng
8e-4
0
R: A
GA
AC
AAT
CA
AG
CC
AG
CA
GC
enha
ncer
pro
tein
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M
abC
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F: C
CTC
GC
AC
ATC
AA
CC
CTT
AC
(C
T)7
8 22
3 56
0.
8199
0.
9474
0.
7973
0.
3890
0.
2280
H
eat s
hock
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R
: CAT
GAT
CA
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pr
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ndin
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M
aAES
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M
abC
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F: T
GA
AC
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TAC
CC
CA
GC
(C
T)6
2 24
9 55
0.
5455
0.
4545
0.
1948
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0000
1.
0000
Pr
obab
le a
lani
ne
1e-3
1
R: T
TAG
TGG
CTT
CTG
TCC
CA
GG
amin
otra
nsfe
rase
CN
PMF-
24
MaA
ES_A
LL07
72
Mab
CN
PMFE
st-2
4 F:
AG
GG
CA
CA
AA
GC
GC
TCA
AG
(C
T)9
2 23
9 56
0.
4959
0
.272
7 0.
3750
0.
6730
0
.040
0*
GTP
bin
ding
/ 2e
-99
R
: CA
ATG
AA
CG
CAT
CA
CA
GTC
C
ph
osph
olip
ase
ac
tivat
orC
NPM
F-25
M
aAES
_ALL
0808
M
abC
NPM
FEst
-25
F: C
GG
AG
GAT
GTT
GTT
CTC
GTC
(C
T)12
2
314
56
0.51
11
0.53
33
0.26
88
0.31
30
0.48
80
Gen
omic
DN
A,
1e-1
3
R: C
AC
GG
GC
TGTA
TTTG
GTA
GG
chro
mos
ome
CN
PMF-
26
MaA
ES_A
LL08
49
Mab
CN
PMFE
st-2
6 F:
TG
GA
GAT
GA
AG
AA
GAT
CG
CC
(C
T)7
6 34
8 55
0.
7376
0.
5909
0.
7339
0.
4270
0
.041
0*
Hea
t sho
ck c
ogna
te
5e-
139
R
: TC
ATC
AA
GTG
CG
TTG
CAT
TC
70
-kD
a pr
otei
nC
NPM
F-29
M
aAES
_ALL
1151
M
abC
NPM
FEst
-29
F: T
CG
TCG
TAG
CAT
TTG
CC
TTC
(C
T)13
7
184
58
0.71
90
0.68
18
0.67
32
0.35
20
0.19
30
Unk
own
-
R: A
CG
CA
CG
AG
TAA
GTT
GTC
CC
Con
tinue
d on
nex
t pag
e
Tabl
e 1.
Pri
mer
seq
uenc
es id
enti
fied
in s
even
ES
T li
brar
ies
(lea
ves
wit
h te
mpe
ratu
re s
tres
s an
d in
fect
ed w
ith
Myc
osph
aere
lla
fijie
nsis
: ear
ly a
nd la
te p
erio
ds,
mal
e fl
ower
, roo
ts a
nd g
reen
pee
l) a
nd 5
Cal
cutt
a 4
BA
C c
onse
nsus
dat
aset
s (V
ilar
inho
s et
al.
2003
).
-
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FUNPEC-RP www.funpecrp.com.brGenetics and Molecular Research 11 (2): 1093-1098 (2012)
Musa spp microsatellite primer validation
Nam
e G
enba
nk a
cces
sion
Lo
cus n
ame
Prim
er se
quen
ce (5
'-3')
Rep
eat
NA
bp
Ta
HE
HO
PIC
LD
H
WE
B
LAST
x-Sw
issp
rot
E-va
lue
N
o.
mot
if
(P
val
ue)
(5%
Pro
b.)
CN
PMF-
30
MaA
ES_A
LL12
41
Mab
CN
PMFE
st-3
0 F:
TTC
CTT
TCTC
TCC
TCC
CA
CC
(C
T)9
8 18
8 54
0.
7608
0.
8571
0.
7444
0.
6340
0.
8110
U
nkno
wn
-
R: T
AG
GG
TTTT
CA
GAT
CG
AC
GC
CN
PMF-
31
MaA
ES_A
LL13
42
Mab
CN
PMFE
st-3
1 F:
AG
CG
GA
AG
AG
GG
TAG
AG
AG
C
(CT)
10
5 27
6 56
0.
6178
0.
2000
0.
5422
0.
5660
0
.000
0*
Unk
own
-
R: A
TCTT
CTG
CTG
GTT
CAT
GG
CC
NPM
F-32
M
aAES
_ALL
1387
M
abC
NPM
FEst
-32
F: A
GG
CTT
CG
AC
CA
CA
AA
CTC
C
(CT)
9 6
158
56
0.61
05
0.59
09
0.58
13
0.64
30
0.17
80
NO
I-lik
e pr
otei
n 8e
-13
R
: AG
CG
TTC
TCG
TTC
CA
ATC
AC
CN
PMF-
37
MA
4_B
AC
0 M
abC
NPM
FBac
-37
F: G
AG
CC
GTG
GC
TGTC
AC
TAA
G
(GA
A) 6
5 30
5 54
0.
5850
0.
6000
0.
5441
0.
3670
0.
2420
TT
12 (t
rans
pare
nt/te
sta12
); 1e
-28
08
L021
_110
000
R
: TAT
AC
TCTC
GAT
CA
CC
GG
GC
antip
orte
r/sol
ute:
hy
drog
en a
ntip
orte
rC
NPM
F-38
M
ICR
O_C
T_
Mab
CN
PMFB
ac-3
8 F:
TC
GC
AA
GA
ATC
TCA
CC
TTC
C
(CT)
13
10
237
56
0.73
62
0.55
00
0.70
23
0.02
90
0.0
000*
A
BC
tran
spor
ter A
fam
ily
2e-5
4
0020
A43
_100
00
R
: TG
GTC
TTC
AG
GTT
CC
GTT
TCC
NPM
F-39
B
AC
111B
014
Mab
CN
PMFB
ac-3
9 F:
TC
AG
CA
GA
CA
ATG
CA
AG
AG
C
(CT)
13
5 34
2 55
0.
5568
0.
6818
0.
4900
0.
7410
0
.011
0*
Unk
now
n -
_1
3000
0
R: G
CA
GTC
CA
AC
TGG
CC
TTAT
GC
NPM
F-41
M
ICR
O_C
T_00
58
Mab
CN
PMFB
ac-4
1 F:
GC
TGC
TCTC
GC
TTG
TTAT
CC
(C
T)24
6
349
56
0.77
22
0.76
92
0.73
86
0.26
50
0.41
40
SNL2
(SIN
3-lik
e 2)
4e
-49
FR
OM
_110
000
R
: GC
TGC
TCTC
GC
TTG
TTAT
CC
CN
PMF-
43
MIC
RO
_AG
_000
2 M
abC
NPM
FBac
-43
F: A
AA
CC
CTC
CA
CC
AA
CA
CC
TC
(AG
) 12
6 28
9 55
0.
7663
0.
6154
0.
7354
0.0
000*
A
lcoh
ol d
ehyd
roge
nase
1e
-47
-1
0-A
39_1
0000
R: G
TTTG
GTG
CTC
ATTG
CTG
TGC
NPM
F-45
M
ICR
O_A
G_0
008
Mab
CN
PMFB
ac-4
5 F:
GTC
AAT
TCC
TAG
CG
AG
AG
CG
(A
G) 9
14
312
55
0.89
88
0.90
00
0.89
46
0.24
40
0.40
90
TT2
DN
A b
indi
ng/
3e-1
2
A40
_500
00
R
: AA
ATTG
AG
CTC
CA
CA
GG
GTG
trans
crip
tion
fact
or
CN
PMF-
49
MIC
RO
_AG
_001
3 M
abC
NPM
FBac
-49
F: A
GA
AG
GG
CTG
GA
AA
GA
GA
GC
(G
A) 19
5
275
56
0.68
44
0.86
67
0.62
82
0.44
50
0.68
10
DN
A b
indi
ng/
9e-1
8
-6--
20-A
41_6
0000
R: A
ATC
CTG
CA
ATTA
TGG
CTG
C
tra
nscr
iptio
n fa
ctor
C
NPM
F-52
M
ICR
O_A
G_0
017
Mab
CN
PMFB
ac-5
2 F:
GC
GTC
AG
GTT
GTC
ATTT
CG
(A
G) 8
10
278
56
0.80
88
0.80
00
0.79
24
0.00
50
0.12
90
Hyp
erse
nsiti
ve-in
duce
d
3e-5
2
A43
_200
00
R
: CG
GC
ATAT
CTA
TCC
AC
CA
CC
resp
onse
AtH
IR1
CN
PMF-
53
MIC
RO
_AG
_001
8
Mab
CN
PMFB
ac-5
3 F:
GG
AA
CA
CA
AA
CA
CG
ATG
CA
G
(AG
) 11
7 23
1 56
0.
7789
0.
7979
0.
7525
0.
4890
0
.013
0*
Unk
now
n -
-9
-A44
_300
0
R: T
TTG
CA
CTT
TGTT
CA
GG
CA
G C
NPM
F-56
M
ICR
O_G
CT_
M
abC
NPM
FBac
-56
F: A
AC
ATG
CA
GA
GG
GA
GTG
GTC
(G
CT)
6 2
309
56
0.60
94
0.78
95
0.20
24
0.00
30
1.00
0 Pr
otei
n B
revi
s rad
ix-li
ke 2
; 6e
-40
00
01-6
--12
--10
-
R: A
TTG
CTG
ATG
GA
GAT
GG
AG
G
O
sBR
XL2
A
40_6
0C
NPM
F-57
M
ICR
O_A
G_
Mab
CN
PMFB
ac-5
7 F:
TAT
CA
AG
CC
TAAT
CG
GC
CA
C
(AG
) 7 8
312
52
0.80
79
0.54
45
0.78
57
1.00
00
0.0
000*
So
lubl
e st
arch
synt
hase
3,
2e-2
1
0032
.SEQ
R: T
GC
ATC
AA
AA
ATTT
CC
AG
CTC
chlo
ropl
astic
/am
ylop
last
icC
NPM
F-60
M
ICR
O_A
G
Mab
CN
PMFB
ac-6
0 F:
TG
AA
ATC
TGA
AC
CC
TGG
TGG
(G
A) 18
8
243
56
0.78
95
0.89
47
0.76
15
0.83
90
0.72
00
NA
C1; t
rans
crip
tion
fact
or
2e-4
2
0044
.SEQ
0
R: A
CG
CA
CA
CA
CA
CA
CA
CA
ATG
CN
PMF-
61
MIC
RO
_AG
_ M
abC
NPM
FBac
-61
F: T
GAT
GC
TCTT
AA
CC
CTT
GC
C
(GA
) 18
8 26
1 56
0.
8306
0.
8182
0.
8080
0.
8820
0.
2120
N
AC1
; tra
nscr
iptio
n fa
ctor
2e
-42
00
44.S
EQ01
R: C
GG
TCC
GAT
TCA
ATAT
CG
TC
Tabl
e 1.
Con
tinue
d.
Nam
e, G
enba
nk a
cces
sion
No.
, loc
us n
ame,
prim
er s
eque
nce
(5'-3
'), re
peat
mot
if, N
A =
num
ber o
f alle
les;
bp
= ba
se p
air o
rigin
al c
lone
d al
lele
; Ta
= op
timum
an
neal
ing
tem
pera
ture
; HE =
exp
ecte
d he
tero
zygo
sity
; HO =
obs
erve
d he
tero
zygo
sity
; PIC
= p
olym
orph
ism
info
rmat
ion
cont
ent;
LD =
link
age
dise
quili
briu
m;
HW
E =
Har
dy-W
einb
erg
equi
libriu
m, B
LAST
x-Sw
issp
rot a
nd E
-val
ue f
or 3
4 M
usa
spp
SSR
loci
val
idat
ed in
22
bana
na a
cces
sion
s ra
ngin
g fr
om w
ild to
im
prov
ed d
iplo
ids.
*Sig
nifi
cant
dep
artu
re f
rom
HW
E.
-
1098
FUNPEC-RP www.funpecrp.com.brGenetics and Molecular Research 11 (2): 1093-1098 (2012)
E.P. Amorim et al.
ACKNOWLEDGMENTS
Research partially supported by the CNPq - the National Council for Scientific and Technological Development (Project #506165/2004-3) and Embrapa (Macroprograma 2 - Ba-nana Genetic Breeding).
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