عنوان مقاله [English]
The Effect of Anti-Transpiration and Plant Protective Materials on Vegetative and Physiological Traits of (Hyssopus officinalis L.) under drought stress
Background and Objectives
Hyssop (Hyssopus officinalis L.) is a perennial and belong to the Lamiaceae family. Drought is the most important environmental stress that adversely affects crop plant performance. The use of anti-transpiration and plant protective materials is one of the ways that has recently been raised to improve the plant resistance under stress conditions. The purpose of this experiment was to investigate the effect of anti-transpiration and plant protective materials on vegetative and physiological traits of Hyssop under drought strees and foliar application time.
Materials and Methods
This research was conducted as a split plot factorial experiment based on a completely randomized design with three replications in 2016-2017. The experimental treatments included irrigation in three levels: 25% water available from the soil (control), 50% water available from the soil (mild stress) and 75% water available from the soil (sever stress) Were the main plots. foliar application in four levels: water (control), kaolin (2.5%), chitosan (0.4 g/ l) and glycine amino acid (2.5 per thousand), and foliar application time: (vegetative and flowering, flowering ) Were the sub plots. In the present study, leaf dry weight, flower dry weight, essential oil yield, shoot dry weight, economic yield, harvest index, proline, soluble sugar were measured.
The results showed that at control strees level, the foliar application of water had the highest of leaf dry weight (81.3 g/m2), Shoot dry weight yield (140.5 g/m2), essential oil yield (9.40 g/m2), economic yield (81.3 g/ m²) and proline content (8.558 (µM/g FW) during flowering and vegetative + flowering, and the foliar application of kaolin during vegetative+flowering, had the highest dry flower weight (53 g/m2). At mild strees level, the foliar application of water during vegetative+flowering included the highest amount of soluble sugar (0.396 mg/g FW) and glycine foliar application at flowering time had the highest harvest index (79%). Also, kaolin spraying during vegetative+flowering had the highest economic yield (73 g/m) and chitosan foliar application during vegetative+flowering had the highest shoot dry weight (111 g/m²) and essential oil yield (7.55 g/m2).
Due to the beneficial effects of antiperspirants and plant protection, they can be used as suitable solutions to increase plant production and reduce the effects of drought stresses in arid and semi-arid regions.
Keywords: Folier application, Harvest index, Soluble sugar, Proline, kaolin, glycine