Document Type : Research Paper

Authors

• Sepideh Hatami ¹
• Seyed Yahya Salehi Lisar ²
• fatemeh rahmani ³
• Latifeh Pourakbar ⁴
• Batol Samadani ⁵

¹ Faculty member of Agriculture and Education research Organization of Iran

² Academic member in university of Tabriz

³ - Department of Biology .Science Faculty. University of Uremia, Urmia .Iran

⁴ Biology Department, Science Faculty, Urmia University, Urmia, Iran

⁵ Faculty member of plant pathology research institute of Iran

Abstract

Drought stress is one of the most critical environmental stresses affecting plants growth and yields worldwide. The use of plant growth regulators such as brassinosteroids can be effective in improving the resistance of plants to environmental stresses. In order to study the effect of 24-Epibrasinolide hormone on the morphological and physiological characteristics of three trials of rye plants under drought stress conditions, a factorial experiment was conducted based on completely randomized design with three replications in the Faculty of Sciences of Urmia University in 2019. The investigated factors include 3 trials of winter Rye plant (Lonkord Variaty provided from seeds and plant improvement institute, farmer usage seeds and a population of rye gathered as weed from different farms), 24-Epibrasinolide hormone in two levels (no foliar application as control and foliar application of 10-8 M) and drought stress in four levels (no-drought stress as control, 6%, 12%, and 18% by polyethylene glycol (PEG6000)) was done. Results showed that different levels of drought stress decreased root and shoot dry weight, root and shoot length, seed vigor index, germination percentage, and flavonoids content of root and shoot, while the content of total phenol, glycine betaine and anthocyanins increased in roots and shoots. On the other hand, foliar application of the 24-Epibrasinolide hormone improved all studied traits, except total phenol content in root and shoot.

Keywords

• Glycine betaine
• Non-enzymatic antioxidants
• Phenolic compounds
• Plant growth regulators
• Polyethylene glycol

Main Subjects

• Physiology