The effect of exogenous spermidine on cucumber plant (Cucumis sativus L.) growth in drought stress

Abstract

The effect of exogenous spermidine (0; 1 and 2 mmol·dm<sup>-3</sup>) on cucumber plant subjected lo seven day drought (30% f.w.c.) were studied. Growth rate of plants, gas exchange, chlorophyll fluorescence, water saturation deficit in tissue (WSD). leakage electrolytes (E<sup>l</sup> as well as the content of free proline were determined. The results showed that drought inhibited growth and gas exchange, decreased the potential efficiency of PSII (F<sup>v</sup>/F<sup>m</sup>) but increased the value of WSD, E<sup>L</sup> and the level of free proline in tissue. The spermidine treatment of plants immediately before drought influenced the decrease concentration of free proline, water deficit and leakage of electrolytes but the increase of stomatal conductance (g<sup>s</sup>), intensity of photosynthesis (P<sup>n</sup> ) and transpiration (E). Greater change on the course of primary photosynthetic reactions in PSII (F<sup>v</sup>/F<sup>m</sup>., ΦPSII, qP, qN) were not detected. The autors concluded, that in drought. conditions exogenous speimidine together with proline induced by stress, contribute to increase of water content in tissue and maintenance of the enzymatic activity of cells as well as they guaIantee the integrity of cell membranes. Profitable effect of spermidine on the condition of cucumber in drought period shorted the time necessary for plants to come back to level of control treatment.

Magnetized Water Confers Drought Stress Tolerance in <i>Moringa</i> Biotype via Modulation of Growth, Gas Exchange, Lipid Peroxidation and Antioxidant Activity

“…Drought stress has been mitigated by using different approaches, including the exogenous application of various chemical and biological agents as well as incorporating various physical methods. Research suggests that various chemical compounds, including proline, abscisic acid (ABA), salicylic acid, jasmonic acid, betain and spermidine, amino acid, hydrogen peroxide (H 2 O 2 ), humic acid, nitric acid and antioxidants have been proven to be useful agents to mitigate drought stress [10][11][12][13]. In addition to these exogenous supplies of biochemical agents, recently the latest strategies and techniques -including robotics, GIS technology, sensors and magnetic water technology -were used as beneficial tools in order to alleviate drought stress among crop plants [14].…”