Biologia Plantarum

, 51:575 | Cite as

Effects of gibberellic acid and prohexadione-calcium on growth, chlorophyll fluorescence and quality of okra plant

  • I. Ilias
  • G. Ouzounidou
  • A. Giannakoula
  • P. Papadopoulou
Brief Communication


The experiment was conducted to identify the response of three cultivars of okra [Abelmoschus esculentus (L.) Moench] to exogenous hormones [gibberellic acid-(GA3) and prohexadione-Ca] applied as foliar spray. Stem and leaf dry masses and stem length were significantly enhanced by the application of exogenous GA3, but prohexadione-Ca inhibited growth. Control and prohexadione-Ca treated okra plants took more time to bloom than did GA3 treated plants. In the fruits of all the cultivars a decrease in fructose content was observed, while protein content remained almost unchanged after the application of the two growth regulators. The small changes in chlorophyll a fluorescence characteristics observed under prohexadione-Ca suggested a weakening of the photochemical processes near the photosystem 2 reaction centre. The lowering of ratio between maximum time to reach maximum fluorescence, Fm (Tmax) and Area (sum of Fm-Ft for t = 0 to t = Tmax) caused by GA3 was probably due to the increase of Area rather than to changes in Tmax.

Additional key words

Abelmoschus esculentus fruit quality photosynthetic quantum yield photosystem 2 growth regulators 



summation of all values (Fm-Ft) for t = 0 to t = Tmax




gibberellic acid




minimal chlorophyll fluorescence when all dark-treated PS 2 reaction centres are open


maximal chlorophyll fluorescence in dark-acclimated leaves


variable fluorescence (Fm-F0)


maximal photochemical yield of PS 2 in dark-acclimated leaves

PS 2

photosystem 2


reaction centre


time to reach Fm


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Copyright information

© Institute of Experimental Botany, ASCR 2007

Authors and Affiliations

  • I. Ilias
    • 1
  • G. Ouzounidou
    • 2
  • A. Giannakoula
    • 1
  • P. Papadopoulou
    • 2
  1. 1.Department of Crop ProductionTechnological Educational Institute of ThessalonikiSindosGreece
  2. 2.Institute of Food TechnologyNational Agricultural Research FoundationLycovrissiGreece

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