The effects of drought stress levels, sulfur application and manganese spraying on some physiological traits of sunflower (Helianthus annuus L)

Document Type : Research Paper

Authors

1 Department of Agronomy and Plant Breeding, University of Kurdistan, Sanandaj, Iran

2 Department of Agronomy and Plant Breeding, Shiraz University, Shiraz, Iran

Abstract

In order to evaluate the effect of different levels of sulfur and manganese application on physiological characteristics of sunflower under different irrigation levels an experiment was conducted in agricultural research Institute of Kurdistan University in spring 2011. A split plot factorial experiment was carried out based on randomized complete block design with 4 replications. Main plot contain three levels of irrigation: 1- control (-3 bar), 2- mild stress (-8 bar) 3- severe stress (-12 bar), and sub plot were contained 2 factor as: 2 levels of sulfur application (1- no application and 2- 30 kg/ha) and the two levels of manganese application (1- control and 2- use of 1 kg/ha manganese). Results indicated that drought stress reduced gas exchange and photosynthesis. Use of sulfur and manganese increased photosynthesis in compared with control and increased chlorophyll b content. Drought stress caused to reduce in relative water content with damaging to cell membrane simultaneously. In drought condition the activity of Catalase reduced but Peroxidase activity increased. Manganese application caused to increase in Catalase activity. Finally fertilizer application could adjust the effect of drought stress to some extent.

Keywords

Iranian Dryland Agronomy Journal
Volume 4, Issue 1 - Serial Number 7
September 2015
Pages 29-44

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