Effects of gibberellic acid and prohexadione-calcium on growth,chlorophyll fluorescence and quality of okra plant |
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| Authors: | I. Ilias G. Ouzounidou A. Giannakoula P. Papadopoulou |
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| Affiliation: | (1) Department of Crop Production, Technological Educational Institute of Thessaloniki, Sindos, GR-54101, Greece;(2) Institute of Food Technology, National Agricultural Research Foundation, Lycovrissi, GR-14123, Greece |
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| 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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| Keywords: | Abelmoschus esculentus fruit quality photosynthetic quantum yield photosystem 2 growth regulators |
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