ISHS Acta Horticulturae 791: V International Symposium on Olive Growing
THE INFLUENCE OF DROUGHT STRESS AND PACLOBUTRAZOL ON QUANTITATIVE CHANGES OF PROTEINS IN OLIVE (OLEA EUROPAEA L.) CULTIVARS BLADI AND MISSION |
| Authors: | K. Arzani, N. Yazdani |
| Abstract:
This study was designed to explore the effect of water stress and paclobutrazol (PBZ) on quantitative protein changes in the leaves of olive (Olea europaea L.) plants. Three-year-old olive trees cultivars Bladi and Mission grown in the 16-liter polyethylene pots in clay loam soil were used. The factorial experimental design was used based on complete randomized block design (RCBD) with four replications. Treatments were drought stress (100 and 40% of potential evapotranspiration ETp) and soil applied with PBZ (0, 0.25 and 0.75 g a.i. pot-1). Quantitative changes in soluble protein in the leaves of the experimental plants were monitored, based on the previously described method. Results indicated significant differences between the quantitative amounts of proteins in the leaves of the experimental plants. Protein content of Mission was unaffected by PBZ treatments, but drought stress induced a significant increase in protein content of this cultivar. PBZ treatments (0.25 and 0.75 g a.i. pot-1) when applied with water stress on the Mission cultivar caused 8 (0.25 g a.i. pot-1) and 21% (0.75 g a.i. pot-1) reduction in protein accumulation. Also in cv. Baladi a higher concentration of protein was observed in the water stress treatments. In addition, PBZ treatments caused a 10 (0.25 g a.i. pot-1) to 25% (0.75 g a.i. pot-1) reduction in protein content compared to the control. In this cultivar when PBZ was applied with a water stress, only the higher concentration of PBZ (0.75 g a.i. pot-1) caused a decrease (9%) in protein content, while the lower concentration had no significant effect. In conclusion, cv. Bladi showed a higher protein content than cv. Mission under water stress conditions. Research will continue in order to explore the amelioration effect of PBZ on water stress and drought resistant mechanism of olive plants. | |
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