Anas Kiwan * (1(, Roula Bayerli (2) and Ali Elkhateeb (3)
(1). Sweida Research Center, General Commission for Scientific Agricultural Research, Syria.
(2). Department of Horticulture, Faculty of Agriculture, Engineering, Damascus University, Syria.
(3). Lattakia Center, General Commission for Scientific Agricultural Research, Syria.
(*Corresponding author: Anas Kiwan. E-mail: anas.kiwan@damascusuniversity.edu.sy).
Received: 27/09/2023 Accepted: 10/10/2024
Abstract:
This research was carried out at Cyano Research Station, Agricultural Scientific Research Center, Lattakia, General Commission for Scientific Agricultural Research, Syria, during two successive seasons, 2020-2021 and 2021-2022 to study the effect of foliar spraying with paclobutrazol (PBZ) on growth of Citrus Jambhiri Lush. seedlings under salt stress conditions. The experiment was designed according to a split-plot design. Five levels of NaCl (0, 8, 16, 24, 32 mS/cm) were applied, and five concentrations of PBZ (0, 250, 500, 1000, 2000 ppm) were foliar sprayed. The results showed that the gradual increase in salt levels resulted a decrease in all the studied parameters. On the other side, the treatment with PBZ improved most of the studied parameters under all studied salt levels. The interaction treatments of PBZ (2000 ppm) and salinity (in all tested levels) showed superiority in average root length (27.54 cm), shoots fresh and dry weight (36.12 g, 14.32 g, respectively), roots fresh and dry weight (31.39 g, 9.89 g, respectively), relative water content (64.82 %), leaf content of chlorophyll a, b and carotenoids (1.40, 0.74 and 0.52 mg/g FW, respectively), proline accumulation (0.92 mg/g), total soluble sugars (0.58 mg/g), leaves concentrations of nitrogen, phosphorus and potassium (4.34, 0.28, 0.74%, respectively) compared with interaction treatments of PBZ (0 ppm) and salinity (16.05 cm for root length, 15.94, 5.69 g for shoots fresh and dry weight, 18.45, 5.51 g roots fresh and dry weight, 52.07% relative water content, 0.97, 0.48, 0.38 mg/g FW chlorophyll a, b and carotenoids, 0.71 mg/g proline, 0.41 mg/g total soluble sugars and 2.84, 0.21, 0.59% NPK concentrations, respectively).
Keywords: Rootstock, Seedlings, Citrus Jambhiri Lush., Salinity, Paclobutrazol.
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