Acta Biologica Hungarica

, Volume 69, Issue 3, pp 325–335 | Cite as

Physiological Effects of the Brown Seaweed (Ascophyllum nodosum) and Humic Substances on Plant Growth, Enzyme Activities of Certain Pepper Plants Grown under Salt Stress

  • Mahmut YildiztekinEmail author
  • Atilla Levent Tuna
  • Cengiz Kaya


This study was aimed to examine the effects of seaweed extract (SW) and humic acid on the fruit yield, dry weight (DW%), protein, proline, lipid peroxidation (LPO) and antioxidative enzyme activity of pepper plants (Capsicum annuum L.) grown under saline conditions (100 mM). The obtained results indicated that salinity stress affected deleteriously plant growth and all other parameters. Besides, the treatment of seaweed (SW) and humic acid (HA) improved vegetative growth in the plant at all concentration levels applied under salinity conditions. Leaf fresh and dry weight was increased by all SW and HA applications in salinity stressed plant compared to those of control. Furthermore, there was a significant improvement in antioxidant enzyme activity, such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) activities in the plant under salt stress and treated with SW and HA compounds. It suggests that seaweed and humic acid can enhance salt stress tolerance and leads to conservation of pepper plant against oxidative stress.

Key words

Capsicum annuum L. salt stress antioxidative enzymes seaweed humic acid 


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© Akadémiai Kiadó Zrt. 2018

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Mahmut Yildiztekin
    • 1
    Email author
  • Atilla Levent Tuna
    • 2
  • Cengiz Kaya
    • 3
  1. 1.Department of Herbal and Animal Production, Koycegiz Vocational SchoolMuğla Sıtkı Kocman UniversityMuğlaTurkey
  2. 2.Department of Biology, Faculty of ScienceMuğla Sıtkı Kocman UniversityMuğlaTurkey
  3. 3.Department of Soil Science and Plant Nutrition, Faculty of AgricultureHarran UniversityŞanlıurfaTurkey

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