Effect of Biochar and Hydrogel on Morphophysiological and Biochemical Characteristics of Common Sage (Salvia officinalis L.) under Drought Stress

Ghias, Shayesteh; Shirmardi, Mostafa; Meftahizadeh, Heidar; Dehestani Ardakani, Maryam

doi:10.22055/ppd.2021.36030.1962

Document Type : Research Paper - Horticulture

Authors

¹ M.Sc. Graduate of Horticultural Sciences, Department of Horticultural Sciences, Faculty of Agriculture & Natural Resources, Ardakan University, Ardakan, Iran

² Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture & Natural Resources, Ardakan University, Ardakan, Iran

³ Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture & Natural Resources, Ardakan University, Ardakan, Iran

https://doi.org/10.22055/ppd.2021.36030.1962

Abstract

Introduction
Drought and low organic carbon content are two main problems for agriculture in arid and semiarid regions. Drought stress is responsible for at least 40% of crop losses in the world. The use of biochar (BC) and hydrogels can decrease adverse effects of drought on the plant. The objective of this study was to evaluate the effect of BC and hydrogel application on morphophysiological and biochemical parameters of Salvia officinalis L. under drought stress (DS).

Materials and Methods
A factorial experiment with a randomized complete block design with three replicates was conducted in the research greenhouse of the Meybod industrial town in 1398/2018 to investigate the BC and hydrogel effects on the growth, physiological and biochemical characteristics of Salvia officinalis L. under drought stress condition. The BC and hydrogel was applied by mixing dry soil at rates of 0, 10, and 20 ton BC.ha^-1, 100, and 200 kg hydrogel.ha^-1with three DS levels of D1 (irrigation in 80% field capacity (FC) as no-stress conditions), D2 (irrigation in 60% FC as mild-stress conditions) and D3 (irrigation in 40% FC as severe-stress conditions). The growth responses were examined included morpho-physiological (i.e., chlorophyll content, leaf area, relative water content (RWC), ion leakage (IL), and phytochemical (i.e., antioxidant activity (AA) and total phenolic content (TPC)) parameters.

Results and Discussion
Results showed that drought stress significantly decreased growth parameters and RWC while increased IL, AA and TPC. Application of 200 kg hydrogel.ha^-1and 20 ton BC.ha^-1 significantly increased chlorophyll index, root and shoot dry weight compared to the control under severe stress condition. At mild stress, all treatments significantly reduced the root:shoot ratio compared to the control. However, in severe stress, only application of 10 and 20 ton BC.ha^-1 significantly reduced this parameter compared to the control. In no stress and sever stress, use of 200 kg hydrogel.ha^-1 increased RWC in plant in comparison with control (15.9 and 5.1% respectively). Results indicated that 200 kg hydrogel.ha^-1and 20 ton BC.ha^-1 treatments significantly decreased IL and TPC in mild and sever stress conditions in comparison with control. All treatments significantly decreased AA in severe stress and control has the highest amount of AA in this level of drought. It seems that use of BC and hydrogel in soil increased soil water holding capacity and improve soil structure. In addition, BC contains various elements that can improve plant nutrition under drought stress. The amount of BC and hydrogel application is very important on the effectiveness of these amendments on the plant characteristics under stress conditions.

Conclusion
The application of hydrogel and biochar could improve the growth indices, leaf relative water content and reduce the total phenol concentration and antioxidant capacity in the plant under drought stress. It seems that these amendments reduce the negative effect of drought stress on the plant by increasing the soil water holding capacity, improving the structure and increasing the availability of nutrients for the plant.

Keywords

20.1001.1.2588543.1401.45.1.6.5

Main Subjects

A: Biotic and Abiotis Stress

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Effect of Biochar and Hydrogel on Morphophysiological and Biochemical Characteristics of Common Sage (Salvia officinalis L.) under Drought Stress

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Volume 45, Issue 1May 2022Pages 67-80

Volume 45, Issue 1
May 2022
Pages 67-80