تغييرات ناشي از تنش خشكي و آسكوربات خارجي روي پارامترهاي رشد و قندهاي محلول در گياه انيسون (.Pimpinella anisum L)

Effects of drought stress and exogenous ascorbate on growth parameters and soluble sugar content in Pimpinella anisum L.

Drought stress provokes ROS production in plant tissues. Pimpinella anisum L. is one of the aromatic herbal plants, which has great export value. The aim of this study was to apply exogenous ascorbate in order to control oxidative stress during drought tolerance. Growth parameter changes and soluble sugar content of Pimpinella anisum were evaluated. In a pot study, drought stress was introduced to treatments with 3 replicates based on 3 levels of field capacity (100, 60 and 25%) and ascorbate (1.4 mM) sprayed to them. According to the results, growth was limited in moderate (60% FC) and severe (25% FC) stress levels, root/shoot dry weight ratio increased. Exogenous ascorbate decreased this ratio and increased growth. Shoot soluble sugar content increased when water potential decreased, while ascorbate treatment reduced it. According to the results exogenous ascorbate could increase the ability of Pimpinella anisum in response to drought stress with different mechanisms and had protective effects against lipid peroxidation due to drought stress.