African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 757

Full Length Research Paper

Effect of seed soaking treatment with growth regulators on phytohormone level and sex modification in cucumber (Cucumis sativus L.)

Hidayat Ullah1*, Asghari Bano2, K. M. Khokhar1 and T. Mahmood1      
1Vegetable Crops Research Programme, Horticulture Research Institute, National Agricultural Research Center Islamabad, Pakistan. 2Department of Biological Sciences, Quaid-e- Azam University Islamabad, Pakistan.  
Email: [email protected]

  •  Accepted: 14 June 2011
  •  Published: 27 September 2011


Field experiments were undertaken at national agricultural research centre Islamabad, Pakistan during 2004 and 2005 to study the seed soaking effects of 2-chloroethylphosphonic acid (ethrel), gibberellic acid and maleic hydrazide (MH) on sex modification in cucumber and to find out the critical phytohormones level of endogenous hormones for lowest sex ratio. Seeds were soaked in different concentrations of growth regulators for 20 h prior to sowing. Seed soaking with MH at 450 mmol/L highly increased the number of pistillate flowers and fruit yield per plant and decreased the sex ratio compared to that of untreated control. The phytohormone levels of indole acetic acid (IAA) at blooming and fruiting stages were significantly higher with  MH at 450 mmol/L and had a positive significant correlation with the number of pistillate flower/plant and negative correlation with sex ratio. Fruit yield had also a positive significant correlation with endogenous IAA. Ethrel also significantly lowered themale to female sex ratio in cucumber.


Key words: Cucumis sativus, sex expression, ethrel, gibberellic acid and maleic hydrazide.