3. Results
3.1. Phenotypic characterization of the BnFUS3 TILLING mutant
lines
The B. napus FUS3 (HM370540) composed of 927 nucleotides
(Supplemental Fig. 1), corresponding to 308 amino acids, was utilized
to generate three BnFUS3 TILLING mutant lines: M1, M2, and
M3. Each mutant line was characterized by a single nucleotide
substitution (Supplemental Fig. 2), corresponding to a respective
amino acid change downstream of the B-3 DNA binding domain
(Supplemental Fig. 3).
Seed maturation in both BnFUS3 mutant and wild type plants
occurred in about 100e110 days with no visible morphological
deviations in embryonic growth. A small decrease in germination
frequency was observed for the mutant lines M1 and M3
(Supplemental Fig. 4). A unique phenotypic trait in Arabidopsis fus3
seeds is a purple coloration due to the accumulation of anthocyanins
(Meinke et al., 1994). In addition to the distorted seed shape,
varying degrees of reddish purple coloration were also observed in
all the seeds of the three BnFUS3 TILLING mutant lines
(Supplemental Fig. 5), suggesting similar effects between the two
species. Among the different agronomic characteristics measured,
the only consistent phenotypic deviation observed in all three
mutants was the reduced number of siliques per plant, resulting in
decreased plant yield (Table 1). Similar trends were also observed
during the other growing season in the greenhouse and with plants
grown in the growth cabinet (Supplemental Tables 2 and 3).
3. Results3.1. Phenotypic characterization of the BnFUS3 TILLING mutantlinesThe B. napus FUS3 (HM370540) composed of 927 nucleotides(Supplemental Fig. 1), corresponding to 308 amino acids, was utilizedto generate three BnFUS3 TILLING mutant lines: M1, M2, andM3. Each mutant line was characterized by a single nucleotidesubstitution (Supplemental Fig. 2), corresponding to a respectiveamino acid change downstream of the B-3 DNA binding domain(Supplemental Fig. 3).Seed maturation in both BnFUS3 mutant and wild type plantsoccurred in about 100e110 days with no visible morphologicaldeviations in embryonic growth. A small decrease in germinationfrequency was observed for the mutant lines M1 and M3(Supplemental Fig. 4). A unique phenotypic trait in Arabidopsis fus3seeds is a purple coloration due to the accumulation of anthocyanins(Meinke et al., 1994). In addition to the distorted seed shape,varying degrees of reddish purple coloration were also observed inall the seeds of the three BnFUS3 TILLING mutant lines(Supplemental Fig. 5), suggesting similar effects between the twospecies. Among the different agronomic characteristics measured,the only consistent phenotypic deviation observed in all threemutants was the reduced number of siliques per plant, resulting indecreased plant yield (Table 1). Similar trends were also observedduring the other growing season in the greenhouse and with plantsgrown in the growth cabinet (Supplemental Tables 2 and 3).
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