The faster fruit development because of flowering reduction
led to an advanced fruit maturity, which is shown in Table 3 for
nectarine ‘Zincal 5’. At harvest, fruit colour and total soluble
solids were significantly higher for fruits treated at 25 mg l1
GA3 and higher concentrations, with regard to untreated fruits.
Accordingly, fruits harvested at the first picking date increased
up to applications of 100 mg l1 GA3 (Table 1). However, even
when the process of fruit maturity involves a natural softening,
fruit firmness showed a significant increase with increasing
GA3 concentration applied (Table 3).
The reduction in the initial number of reproductive
developing sinks, also affected vegetative growth at harvest.
Internode length of lateral shoots was significantly increased in
nectarine cv. ‘Zincal 5’ when trees were treated with 50 mg l1
GA3 or higher concentrations, with regard to control; internode
length of apical shoots was significantly increased only for
150 mg l1 GA3 concentrations or higher (data not shown).
The residual effects of different GA3 concentrations applied
to peach cv. ‘Springlady’ were evaluated at bloom in the second
spring after treatment. There were not significant differences in
the number of flowers per metre of shoot length between control
and treated trees (data not shown). The small differences found
between treatments could not be attributed to the treatments
themselves. Indeed, flower density in control trees did not vary
significantly between the two following years after treatments
(51.1 6.1 and 59.4 3.9 flowers per metre, respectively).
The faster fruit development because of flowering reductionled to an advanced fruit maturity, which is shown in Table 3 fornectarine ‘Zincal 5’. At harvest, fruit colour and total solublesolids were significantly higher for fruits treated at 25 mg l1GA3 and higher concentrations, with regard to untreated fruits.Accordingly, fruits harvested at the first picking date increasedup to applications of 100 mg l1 GA3 (Table 1). However, evenwhen the process of fruit maturity involves a natural softening,fruit firmness showed a significant increase with increasingGA3 concentration applied (Table 3).The reduction in the initial number of reproductivedeveloping sinks, also affected vegetative growth at harvest.Internode length of lateral shoots was significantly increased innectarine cv. ‘Zincal 5’ when trees were treated with 50 mg l1GA3 or higher concentrations, with regard to control; internodelength of apical shoots was significantly increased only for150 mg l1 GA3 concentrations or higher (data not shown).The residual effects of different GA3 concentrations appliedto peach cv. ‘Springlady’ were evaluated at bloom in the secondspring after treatment. There were not significant differences inthe number of flowers per metre of shoot length between controland treated trees (data not shown). The small differences foundbetween treatments could not be attributed to the treatmentsthemselves. Indeed, flower density in control trees did not varysignificantly between the two following years after treatments(51.1 6.1 and 59.4 3.9 flowers per metre, respectively).
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