caa a22 4500 463159985 CHVBK 20180406164744.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10535-007-0126-5 doi (NATIONALLICENCE)springer-10.1007/s10535-007-0126-5 Effects of gibberellic acid and prohexadione-calcium on growth, chlorophyll fluorescence and quality of okra plant [Elektronische Daten] [I. Ilias, G. Ouzounidou, A. Giannakoula, P. Papadopoulou] 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. Institute of Experimental Botany, ASCR, 2007 Abelmoschus esculentus nationallicence fruit quality nationallicence photosynthetic quantum yield nationallicence photosystem 2 nationallicence growth regulators nationallicence Area : summation of all values (Fm-Ft) for t = 0 to t = Tmax nationallicence Chl : chlorophyll nationallicence GA3 : gibberellic acid nationallicence Prohex-Ca : prohexadione-calcium nationallicence F0 : minimal chlorophyll fluorescence when all dark-treated PS 2 reaction centres are open nationallicence Fm : maximal chlorophyll fluorescence in dark-acclimated leaves nationallicence Fv : variable fluorescence (Fm-F0) nationallicence Fv/Fm : maximal photochemical yield of PS 2 in dark-acclimated leaves nationallicence PS 2 : photosystem 2 nationallicence RC : reaction centre nationallicence Tmax : time to reach Fm nationallicence Ilias I. Department of Crop Production, Technological Educational Institute of Thessaloniki, GR-54101, Sindos, Greece aut Ouzounidou G. Institute of Food Technology, National Agricultural Research Foundation, GR-14123, Lycovrissi, Greece aut Giannakoula A. Department of Crop Production, Technological Educational Institute of Thessaloniki, GR-54101, Sindos, Greece aut Papadopoulou P. Institute of Food Technology, National Agricultural Research Foundation, GR-14123, Lycovrissi, Greece aut Biologia Plantarum Kluwer Academic Publishers-Consultants Bureau 51/3(2007-09-01), 575-578 0006-3134 51:3<575 2007 51 10535 https://doi.org/10.1007/s10535-007-0126-5 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10535-007-0126-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ilias I. Department of Crop Production, Technological Educational Institute of Thessaloniki, GR-54101, Sindos, Greece aut NATIONALLICENCE 700 1- Ouzounidou G. Institute of Food Technology, National Agricultural Research Foundation, GR-14123, Lycovrissi, Greece aut NATIONALLICENCE 700 1- Giannakoula A. Department of Crop Production, Technological Educational Institute of Thessaloniki, GR-54101, Sindos, Greece aut NATIONALLICENCE 700 1- Papadopoulou P. Institute of Food Technology, National Agricultural Research Foundation, GR-14123, Lycovrissi, Greece aut NATIONALLICENCE 773 0- Biologia Plantarum Kluwer Academic Publishers-Consultants Bureau 51/3(2007-09-01), 575-578 0006-3134 51:3<575 2007 51 10535 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer