Eng Somayeh Aghlmand, Dr Behrooz Esmaielpour, Eng Parisa Jalilvand, Eng Hamid Reza Hiedari, Eng Nassibeh Tavakoli-Hassankelo,
Volume 6, Issue 19 (vol.6,no. 19, Year 2017 2018)
Abstract
Drought stress is a limiting factor for production in agriculture. In order to evaluate the impact of plant growth regulators, Salicylic acid and Paclobutrazol on growth and physiological traits of Sweet Basil (Ocimum basilicum) under drought stress condition, a factorial pot experiment based on Randomized complete design with 4 replication was carried out at research greenhouse of Mohaghegh Ardabili University, at 2012. experimental treatments were including water deficit stress (100, 60 and 30% percent of field capacity), two times foliar spraying with 100 and 200 ppm of salicylic acid and Paclobutrazol with two weeks interval. Controls sprayed by distillated water. Results indicated that the effects of water deficit stress, salicylic acid and Paclobutrazol foliar spraying on plant height, leaf dry matter, number of leaves, leaf area, stomatal conductance, relative water content and phosphorous content of leaves were significant (p&le0.01x). Parallel to raising water deficit stress, plant height, leaf dry weight, leaf surface area, phosphorus content and relative water content were reduced. Foliar spraying of salicylic acid and Paclobutrazol significantly increased relative water content, chlorophyll and proline content of basil leaves under drought stress condition. for conclusion, the research work revealed that application of salicylic acid enhanced tolerance against drought stress in basil plants, and the highest values for most of traits obtained by 200 ppm foliar spraying of salicylic acid.
Hassan Jalilvand Shirkhanitabar, Afshin Tavakoli, Foad Moradi, Farid Shekari,
Volume 9, Issue 39 (vol. 9, no. 39 2020)
Abstract
A greenhouse study was conducted to evaluate of salicylic acid foliar effect on morphological and biochemical characters of Stevia (Stevia rebaudiana) based on a Completely Randomized Design (CRD) experiment with three replications in Qazvin, Iran in 2016. The treatments of this research were defined as salicylic acid foliar levels as 0 (control), 100, 300 and 600 µM which were applied three months after transplanting. Evaluated characters were as plant height, branch number, plant dry weight, leaves dry weight, branches dry weight, the ratio of leaf to total dry weight, the percentage and yield of stevioside, rebaudioside-A, rebaudioside-B and rebaudioside-c. The results of this study revealed that foliar levels of salicylic acid had a significant effect on all of the evaluated characters except for SPAD index. The treatment of foliar 100 µM salicylic acid led to a significant increase in plant height, stevioside percentage, rebaudioside C yield and its percentage compared with control treatment (18.2%, 91.7%, 160% and 186%, respectively). By increasing the concentration of salicylic acid foliar level to 300 µM, the branches dry weight, leaves dry weight, plant dry weight, stevioside yield, rebaudioside. A percentage and its yield were increased in comparison to control treatment (3.9%, 10.3%, 7.0%, 84.6, 78.3 and 100%, respectively). Finally the treatment of 600 µM salicylic acid foliar level was significantly led to an increase in lateral branches number, the ratio of leaves dry weight to branches dry weight, rebaudioside-B percentage and its yield compared to control treatment (365.8%, 43.0%, 383.3and 344.4%, respectively). Therefore, a concentration of 300 μM foliar application of salicylic acid can be effective for increasing the quantitative and qualitative performance of Stevia.
