Effects of gibberellic acid and prohexadione-calcium on growth, chlorophyll fluorescence and quality of okra plant
2007
Ilias, I.,Technological Educational Inst. of Thessaloniki, Sindos (Greece). Dept. of Crop Production | Ouzounidou, G.,National Agricultural Research Foundation, Lycovrissi (Greece). Inst. of Food Technology | Giannakoula, A.,Technological Educational Inst. of Thessaloniki, Sindos (Greece). Dept. of Crop Production | Papadopoulou, P.,National Agricultural Research Foundation, Lycovrissi (Greece). Inst. of Food Technology
The experiment was conducted to identify the response of three cultivars of Abelmoschus esculentus 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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