The recipient and donor lines were crossed and
backcrossed following the modification process
described in the material and method section. The F1
generation which is in a GT heterozygous genotype,
was backcrossed separately with their recurrent parents,
057(GG) and XB(GG), and generated two Wx
genotypes GG and GT. By PCR–AccI marker recognition
and selection, the GG-type plants were discarded
and the GT-type individuals that had nearly
identical phenotype to the recurrent parent were
backcrossed consecutively with the recurrent parent.
The modification of 057(GG) was achieved by one
generation of cross, four generations of recurrent
backcross, and multiple rounds of selfing. Six stable
lines that had the TT genotype and agronomic
characteristics similar to the recurrent parent
057(GG) were selected. Of the six lines, ZH171 was
most identical to 057(GG) and was designated as
057(TT) (Lane 6 in Fig. 1). The modification of
XB(GG) was achieved by one generation of cross, two
generations of recurrent backcross, and multiple
generations of selfing. Five stable plants were selected
based on the TT Wx genotype, larger panicle, and the
highest similarity of agronomic characteristics to the
recurrent parent XB(GG). Of the five, line nh136 was
most identical to XB(GG) except for panicle size and
was designated as XB(TT) (Lane 7 in Fig. 1). Meanwhile,
the TT Wx genotype was transferred from
XB(TT) into the isogenic male sterile line XA(TT) by
crossing and recurrent backcrossing with XA(GG)
(Lane 8 in Fig. 1). The AC of the two improved lines,
057 (TT) and XB(TT), were reduced to 14.3 and
11.9% from 27.3 to 25.0%, respectively. The GBSS
activities dropped to 5.8 and 5.0 nmol/g min from
10.2 to 9.4 nmol/g min, respectively. The AC of
XA(TT) was also reduced from 25.2 to 10.7%
(Table 2).
The recipient and donor lines were crossed andbackcrossed following the modification processdescribed in the material and method section. The F1generation which is in a GT heterozygous genotype,was backcrossed separately with their recurrent parents,057(GG) and XB(GG), and generated two Wxgenotypes GG and GT. By PCR–AccI marker recognitionand selection, the GG-type plants were discardedand the GT-type individuals that had nearlyidentical phenotype to the recurrent parent werebackcrossed consecutively with the recurrent parent.The modification of 057(GG) was achieved by onegeneration of cross, four generations of recurrentbackcross, and multiple rounds of selfing. Six stablelines that had the TT genotype and agronomiccharacteristics similar to the recurrent parent057(GG) were selected. Of the six lines, ZH171 wasmost identical to 057(GG) and was designated as057(TT) (Lane 6 in Fig. 1). The modification ofXB(GG) was achieved by one generation of cross, twogenerations of recurrent backcross, and multiplegenerations of selfing. Five stable plants were selectedbased on the TT Wx genotype, larger panicle, and thehighest similarity of agronomic characteristics to therecurrent parent XB(GG). Of the five, line nh136 wasmost identical to XB(GG) except for panicle size andwas designated as XB(TT) (Lane 7 in Fig. 1). Meanwhile,the TT Wx genotype was transferred fromXB(TT) into the isogenic male sterile line XA(TT) bycrossing and recurrent backcrossing with XA(GG)(Lane 8 in Fig. 1). The AC of the two improved lines,057 (TT) and XB(TT), were reduced to 14.3 and11.9% from 27.3 to 25.0%, respectively. The GBSSactivities dropped to 5.8 and 5.0 nmol/g min from10.2 to 9.4 nmol/g min, respectively. The AC ofXA(TT) was also reduced from 25.2 to 10.7%(Table 2).
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