The effect of different concentrations of salicylic acid on Basil (Ocimum basilicum L.) seed yield and yield components under influence of different humidity conditions

Subject Areas : Crop Production Research

Zabiholah Rostami ¹ , Saeed Sayfzadeh ² , Seyed Alireza Valadabadi ³ , HamidReza Zakerin ⁴ , ناصر شهسواری ⁵

1 - Department of Agronomy, Takestan Branch, Islamic Azad University, Takestan, Iran
2 - Department of Agronomy, College of Agriculture, Takestan Branch, Islamic Azad University, Takestan, Iran
3 - Department of Agronomy, Takestan Branch, Islamic Azad University, Takestan, Iran.
4 - Department of Agronomy, Takestan Branch, Islamic Azad University, Takestan, Iran.
5 - گروه تولیدات گیاهی، دانشگاه آزاد اسلامی واحد حاجی اباد

Received: 2024-04-07 Accepted : 2024-06-08 Published : 2024-07-30

Keywords: Basil, Biological and seed yield, Salicylic acid, Seed yield components,

Abstract :

Basil with numerous medicinal characteristics is one of the most important plants of the mint family (Lamiaceae). Among the factors affecting the growth and development and the production of effective substances of medicinal and aromatic plants is water, which is more effective than other institutions for reduction. Research has shown that salicylic acid makes plants resistant to environmental stresses. Therefore, in order to investigate the effect of foliar spraying of salicylic acid on the quantitative and qualitative characteristics of basil plants under the influence of drought stress, an experiment was conducted in the form of split plots based on randomized complete block design in 3 replications in a private farm located in Mahdasht area of Karaj city in 1394-1395 and 1395-1396. Irrigation in 4 levels: I1: 100%, I2: 80%, I3: 60% and I4: 40%. The volume of water required in the main plots and salicylic acid in 5 levels: S1: No application (spraying solution with water net as control), S2: foliar spraying with a concentration of 50 μM, S3: 100 μM, S4: μM and S5: 200 μM were placed in the subplots. The results showed that the water deficit caused a decrease in the number of spikes per plant, the number of hazelnuts per plant, the number of seeds per hazelnut and the 100-seed weight, and the use of salicylic acid increased the number of spikes, the number of hazelnuts per plant and 100-seed weight. Under the influence of water deficit, biological and seed yield decreased and with increasing concentration of salicylic acid, biological and seed yield increased significantly. By increasing the concentration of salicylic acid in all humidity regimes, biological and seed yield also showed a significant increase. Also, the response of basil plant to salicylic acid under drought stress conditions was very significant compared to the conditions of supplying 100% of the plant's water needs (full irrigation). Finally, due to the adverse effect of drought stress on the growth and production of basil plant, it seems necessary to use salicylic acid to moderate drought stress.