3. Results
All GA3 treated H. humboldtianus plants produced flowers and
application of GA3 significantly reduced the time to flowering
(P < 0.05). Furthermore, growth and flowering responses of plants
to GA3 were similar in both seasons. Therefore, data obtained during
two seasons were pooled and presented in Table 1.
Plants treated with 200mgl−1 GA3 initiated flowers within
10.0 days of the second GA3 treatment and this was significantly
different (P < 0.05) from all the other treatments (Table 1) The application
of GA3 also increased the number of inflorescences per plant
(Table 1). The highest number of inflorescences was observed at 7
weeks after second GA3 treatment in plants treated either with
100 or 200mgl−1 GA3 concentration (11.0±2.4 and 10.9±1.8,
respectively) (Table 1). The lowest GA3 concentration (50mgl−1)
did not increase the number of inflorescences compared to that
of untreated plants. Furthermore, application of GA3 increased
the number of flowers per inflorescence (P < 0.05) and the highest
number of flowers per inflorescence was observed at 200mgl−1
concentration (24.0±0.5) (Table 1).
Application of GA3 affected not only reproductive growth, but
also vegetative growth of H. humboldtianus. The untreated plants
were shorter (2.5±0.3 cm) compared to that of treated plants and
the tallest plants were obtained at 50mgl−1 (4.1±0.6 cm)GA3 concentration.
However, no significant differences between 50, 100
and 200mgl−1 GA3 concentrations were observed (Table 1).
With increased GA3 concentration petiole and peduncle lengths
were also increased. The tallest inflorescences were observed
in plants treated with 200mgl−1 GA3 concentration (15.3±1.2)
which was significantly different compared to that of untreated
plants (10.2±1.3 cm) while longest petioles were observed at
100mgl−1 GA3 concentration which was significantly different
compared to the untreated plants. However, no significant differences
were observed for petiole length as well as peduncle length
between the GA3 treatments (Table 1).
3. Results
All GA3 treated H. humboldtianus plants produced flowers and
application of GA3 significantly reduced the time to flowering
(P < 0.05). Furthermore, growth and flowering responses of plants
to GA3 were similar in both seasons. Therefore, data obtained during
two seasons were pooled and presented in Table 1.
Plants treated with 200mgl−1 GA3 initiated flowers within
10.0 days of the second GA3 treatment and this was significantly
different (P < 0.05) from all the other treatments (Table 1) The application
of GA3 also increased the number of inflorescences per plant
(Table 1). The highest number of inflorescences was observed at 7
weeks after second GA3 treatment in plants treated either with
100 or 200mgl−1 GA3 concentration (11.0±2.4 and 10.9±1.8,
respectively) (Table 1). The lowest GA3 concentration (50mgl−1)
did not increase the number of inflorescences compared to that
of untreated plants. Furthermore, application of GA3 increased
the number of flowers per inflorescence (P < 0.05) and the highest
number of flowers per inflorescence was observed at 200mgl−1
concentration (24.0±0.5) (Table 1).
Application of GA3 affected not only reproductive growth, but
also vegetative growth of H. humboldtianus. The untreated plants
were shorter (2.5±0.3 cm) compared to that of treated plants and
the tallest plants were obtained at 50mgl−1 (4.1±0.6 cm)GA3 concentration.
However, no significant differences between 50, 100
and 200mgl−1 GA3 concentrations were observed (Table 1).
With increased GA3 concentration petiole and peduncle lengths
were also increased. The tallest inflorescences were observed
in plants treated with 200mgl−1 GA3 concentration (15.3±1.2)
which was significantly different compared to that of untreated
plants (10.2±1.3 cm) while longest petioles were observed at
100mgl−1 GA3 concentration which was significantly different
compared to the untreated plants. However, no significant differences
were observed for petiole length as well as peduncle length
between the GA3 treatments (Table 1).
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