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Suppression of stem growth
in pot kalanchoe ‘Gold Strike’ by recycled subirrigational
supply of plant growth retardants
Seung Jae Hwang1,2, Mi Young Lee1,
Young Hoon Park3, Iyyakkannu Sivanesan1
and Byoung Ryong Jeong1,2*
1Department
of Horticulture, Division of Applied Life Science, Graduate
School, Gyeongsang National University, Jinju 660-701, South
Korea.
2Research
Institute of Life Science, Gyeongsang National University,
Jinju 660-701, South Korea.
3Department
of Horticultural Bioscience, Division of Natural Resources
and Life Science, Pusan National University, Miryang
627-706, South Korea.
*Corresponding author. E-mail:
brjeong@gnu.ac.kr.
Accepted 10 April, 2008 |
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Effect of concentration of
paclobutrazol and uniconazole supplied to the recycling
nutrient solution in an ebb and flow system on the growth
and flowering of kalanchoe cultivar ‘Gold Strike’ was
examined. Plants potted in 10 cm (370 mL) pots were supplied
with a nutrient solution containing 80 mL per pot of 0.5,
1.0, or 2.0 mgּL-1 paclobutrazol or of 0.125,
0.250, or 0.50 mgּL-1 uniconazole. Plants were
irrigated five times during the reproductive short day
treatment period. During each irrigation, the nutrition
solution was filled to a depth of 2 cm above the pot base
and was left for about 15 min before drainage to reservoir.
The control treatment, a foliar spray of 240 mLּm-2
of 10 mg L-1 placlobutrazol or 2.5 mgּL-1
uniconazole was applied twice after pinching at one week
interval. At all applied concentrations, plant size, flower
stem length and stem diameter decreased as compared to the
control. However, the number of florets increased in the
treated plants. Results indicate that the subirrigational
optimum concentration was 0.5 mgּL-1
paclobutrazol and 0.125 mgּL-1 uniconazole is
comparable to foliar spray. Therefore, subirrigational
application of growth retardants at lower concentrations
could be used as an effective mean for suppressing stem
growth. More uniform and environmentally sound application
of growth retardants with the same effectiveness could be
achieved.
Key words:
Cuttings, Kalanchoe blosfeldiana, paclobtrazol,
uniconazole. |
