Abstract
Growth retardants have been proven to prevent excessive stem elongation and reduce internode length in plants by inhibiting the effect of cell division and enlargement of cell in plants. This study was aimed to evaluate the effect of concentrations of daminozide and maleic hydrazide on growth, physiology and flowering of chrysanthemum cultivar Punch under protected condition. The treatments composed of two growth retardants: daminozide at four different concentrations (1000, 1500, 2000 and 2500 ppm) with three frequencies (7, 14 and 21 days after darkening) and maleic hydrazide at three different concentrations (500, 750 and 1000 ppm) with two frequencies (7 and 21 days after darkening) along with control (no spray given). Hence based on the results obtained, it can be concluded that single application of daminozide at 2500 ppm at seven days after darkening reduced the plant height at considerable height (34.33, 83.33 and 103.58 cm) at critical stages and improved total leaf area (1694.55 and 1745.27 cm2) at bud appearance and peak flowering stage and showed earliness in flowering and days to harvest (44.72 and 81.33 day), increased pedicel length (5.87 cm), cut stem girth (3.24 cm), stem fresh weight (68.00 g/stem) and chlorophyll (1.93, 2.53 and 2.80 mg/g) and soluble protein content (65.66, 72.33 and 80.66 mg/g) at critical stages. Increased cut stem yield (77.34 stems/m2) and improved vase life (12.50 day) were also recorded. This may be recommended to improve growth and flower quality of ‘Punch’ chrysanthemum under greenhouse conditions. Key words: Chrysanthemum, daminozide, maleic hydrazide, growth, flowering.
Highlights
IntroductionPhy ysiolog gy and flowerring off chrys santhe emum var
Growth, phy ysiolog gy and flowerring off chrys santhe emum var
This study wa as aimed to evaluate the effect off concentrations of daminozide and maleic hydra azide on gro owth, physio ology and flowering of o chrysanthemum cultiv var Punch under protectted conditio on
Summary
Phy ysiolog gy and flowerring off chrys santhe emum var. Punch h as afffected d by da aminozzide an nd maleic hydrazid de Sellappan Ganesh1*,, Manickam m Kannan , Murugaia ah Jawaha arlal and Prabhaka aran Jeyak kumar. Growth reta ardants have e been prove en to preventt excessive s stem elongattion and reduce internod de length in plants by y inhibiting the effect of cell division and enlarge ement of celll in plants. T. This study wa as aimed to evaluate the effect off concentrations of daminozide and maleic hydra azide on gro owth, physio ology and flowering of o chrysanthemum cultiv var Punch under protectted conditio on. 500 ppm) with three frequencies s (7, 14 and 21 days affter darkenin ng) and malleic hydrazid de at three different concentratiions Based on the t results obtained, it can be co oncluded tha at single application of daminoz zide at 2500
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