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2015 Vol.33, Issue 6 Preview Page
Foliar Application of Growth Bioregulators Influences Floral Traits, Corm- associated Traits and Chemical Constituents in Gladiolus grandiflorus L.
Yasar Sajjad12*
,
Muhammad Jafar Jaskani2
,
Muhammad Qasim2
,
Gulzar Akhtar3
,
Asim Mehmood4
1Department of Environmental Sciences, COMSATS Institute of Information Technology
2Institute of Horticultural Sciences, University of Agriculture
3Department of Horticulture, University College of Agriculture, University of Sargodha
4Department of Biosciences, COMSATS Institute of Information Technology
*교신저자. *Corresponding Author. 
31 December 2015. pp. 812-819
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Abstract

Gladiolus is one of the most popular cut flowers in the world floral market and is highly attractive to consumers. The production of poor-quality gladiolus spikes is one of the most important hurdles to obtaining high prices for this crop. The main objectives of this study were to improve the quantitative characteristics of gladiolus spikes, to increase propagule production and to enhance chemical constituent levels in leaves to help improve plant growth. We performed foliar application of bioregulators, including polyamines (putrescine and spermine) and vitamins (ascorbic acid and thiamine), at different concentrations (0, 0.1, 0.4, 0.7 and 1 mM) to gladiolus plants at the three leaf, five leaf and slipping stages. Application of 1 mM putrescine was the most effective treatment, with prominent effects on economically important spike traits including spike length (55.53 cm), spike diameter (7.53 mm), florets per spike (13.99), first floret diameter (9.66 cm) and first floret weight (4.90 g), followed by spermine treatment. The 1 mM putrescine treatment also had positive effects on corm-associated traits including corm diameter and corm weight, with values of 4.57 cm and 26.16 g compared to 3.47 cm and 17.16 g in control plants, respectively. The contents of chemical constituents in leaves, including total chlorophylls (8.06 mg･g-1), total carotenoids (1.66 mg･g-1), total soluble sugars (4.75 mg･g-1) and phenolics (0.89 mg･g-1) increased in response to foliar application of 1 mM putrescine compared to the control. Ascorbic acid and thiamine also had positive effects on various plant morphological traits and chemical constituents in leaves compared to control plants, but the growth-promoting effects of polyamines were more pronounced. Hence, applying polyamines to gladiolus leaves will help improve spike production and increasing propagule (cormel) yields.

Keywords
bulbous plant
growth enhancement
morphological attributes
polyamines
vitamins

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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 33
  • No :6
  • Pages :812-819
  • Received Date : 2015-03-19
  • Revised Date : 2015-06-30
  • Accepted Date : 2015-07-11
  • DOI :https://doi.org/10.7235/hort.2015.15052
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