Abstract
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.
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Abbreviations
- Area:
-
summation of all values (Fm-Ft) for t = 0 to t = Tmax
- Chl:
-
chlorophyll
- GA3 :
-
gibberellic acid
- Prohex-Ca:
-
prohexadione-calcium
- F0 :
-
minimal chlorophyll fluorescence when all dark-treated PS 2 reaction centres are open
- Fm :
-
maximal chlorophyll fluorescence in dark-acclimated leaves
- Fv :
-
variable fluorescence (Fm-F0)
- Fv/Fm :
-
maximal photochemical yield of PS 2 in dark-acclimated leaves
- PS 2:
-
photosystem 2
- RC:
-
reaction centre
- Tmax :
-
time to reach Fm
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Ilias, I., Ouzounidou, G., Giannakoula, A. et al. Effects of gibberellic acid and prohexadione-calcium on growth, chlorophyll fluorescence and quality of okra plant. Biol Plant 51, 575–578 (2007). https://doi.org/10.1007/s10535-007-0126-5
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DOI: https://doi.org/10.1007/s10535-007-0126-5