IMPACT OF GROWTH RETARDANTS ON GROWTH AND FLORAL CHARACTERS OF CHRYSANTHEMUM POTMUMS (Dendranthema grandiflora)
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Date
2016-11-01
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College of Horticulture, Rajendranagar, HYD-30
Abstract
The present investigation entitled “Impact of growth retardants on
growth and floral characters of chrysanthemum potmums (Dendranthema
grandiflora)”was carried out at floriculture research station, Rajendranagar,
Hyderabad during the rabi season of 2015-2016. In the present investigation, an
attempt has been made to determine the effect of different growth retardants on
growth characters and floral characters of chrysanthemum potmums. The
experiment was carried out in Completely Randomized Design.
In the present experiment, fourteen treatments were imposed with 3
replications.The treatments were T1 (Paclobutrazol 30 ppm), T2 (Paclobutrazol
60 ppm), T3(Paclobutrazol at 90 ppm), T4(Daminozide 500 ppm), T5(Daminozide
750 ppm), T6 (Daminozide 1000 ppm), T7 (Ethephon 250 ppm), T8 (Ethephon
500 ppm), T9 (Ethephon 750 ppm), T10 (Ethephon 1000 ppm), T11(Uniconazole 4
ppm), T12 (Uniconazole 8 ppm), T13 (Uniconazole 16 ppm), T14 (Control).
The data on vegetative growth was recorded on plant height, number of
primary branches, plant spread at E-W and N-S, leaf length, leaf width, SCMR
value, internodal length, diameter of the main stemand data regarding flowering
was recorded on days to 1st flower bud appearance, days to 50% flowering,
number of flower stems per plant, number of flowers per stem, number of
flowers per plant, peduncle length, flower diameter, weight of the flower,
duration of flowering, vase life.The results obtained were stastistically analyzed
in CRD. Salient features of the findings are summerized here under.
Name of the author
: B.SHAILAJA
Title of the thesis :“IMPACT OF GROWTH RETARDANTS ON
GROWTH AND FLORAL CHARACTERS OF
CHRYSANTHEMUM POTMUMS
(DENDRANTHEMA GRANDIFLORA).”
Degree to which it is
submitted
: MASTER OF SCIENCE
Faculty : HORTICULTURE
Discipline : FLORICULTURE AND LANDSCAPE
ARCHITECTURE
Major Advisor : Dr. R. CHANDRASHEKHAR
University : SRI KONDA LAXMAN TELANGANA STATE
HORTICULTURAL UNIVERSITY
Year of Submission : 2016
The results of experiment regarding vegetative parameters revealed that
maximum reduction in the plant height (16.92 cm), plant spread E-W (19.42 cm)
and N-S (17.75 cm), maximum SCMR value (74.86) were recorded with
application of paclobutrazol at 90 ppm (T3) which was on par with paclobutrazol
at 60 ppm (T2). Maximum diameter of main stem (7.73 mm), leaf length (6.26
cm), leaf width (4.41cm) were found in (T6) daminozide at 1000 ppm.
Maximum number of primary branches (7.83) were found with (T1)
paclobutrazol at 30 ppm and on par with (T9) ethephon at 750 ppm (7.75).
Moderate reduction in plant height (24.25 cm), inter nodal length (0.86 cm),
plant spread E-W (32.75cm), plant spread N-S (33.50 cm) were recorded with
application of daminozide at 1000 ppm. Maximum reduction in internodal length
(0.50 cm) was observed in paclobutrazol 60 ppm (T2) and on par with
paclobutrazol at 30 ppm (0.54 cm).
With respect to floral parameters earliness in number of days to 1st floral
bud appearance (75.17 days) was found with application of daminozide 1000
ppm followed by application of paclobutrazol 90 ppm and daminozide 750 ppm.
Earliness in 50% flowering (100.00 days) and maximum duration of flowering
(68.00), maximum number of flowers per stem (37.66) and number of flowers
per plant (217.25) were found with (T6) daminozide at 1000 ppm which was on
par with (T5) daminozide at 750 ppm. Maximum number of flower stems per
plant (6.83) were observed in (T12) uniconazole at 8 ppm and was on par with
(T11) uniconazole at 4 ppm (6.33). Maximum peduncle length (6.91 cm) was
observed with (T4) daminozide at 500 ppm. Maximum diameter (3.98 cm) and
weight of the flower (1.46 g) were observed in (T10) ethephon at 1000 ppm.
Maximum vase life was found with (T4) daminozide at 500 ppm (16.33 days)
which was on par with (T5) daminozide at 750 ppm (15.33 days).
The moderate growth reduction and increased chlorophyll in
chrysanthemum potmums and earliness in flower bud appearance and 50%
flowering, highest number of flowers per stem and number of flowers per plant,
duration of flowering were observed with apllication of daminozide at 1000 ppm
followed by application of daminozide at 750 ppm. These results were attributed
to breakdown of gibberellin bio synthesis and suppression of vegetative growth
which in turn promotes more buds to differentiate into flower buds with
increased mobilization of photosynthates for flowering, which might have
resulted in uniform growth and flowering producing higher quality of potted
plants.
Description
In the present experiment, fourteen treatments were imposed with 3
replications.The treatments were T1 (Paclobutrazol 30 ppm), T2 (Paclobutrazol
60 ppm), T3(Paclobutrazol at 90 ppm), T4(Daminozide 500 ppm), T5(Daminozide
750 ppm), T6 (Daminozide 1000 ppm), T7 (Ethephon 250 ppm), T8 (Ethephon
500 ppm), T9 (Ethephon 750 ppm), T10 (Ethephon 1000 ppm), T11(Uniconazole 4
ppm), T12 (Uniconazole 8 ppm), T13 (Uniconazole 16 ppm), T14 (Control).
Keywords
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Citation
Sri Konda Laxman Telangana State Horticultural University, Rajendranagar, Hyderabad-30