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- Title
Humic acid regulates gene expression and activity of antioxidant enzymes to inhibit the salt-induced oxidative stress in finger millet.
- Authors
Rakkammal, Kasinathan; Pandian, Subramani; Maharajan, Theivanayagam; Antony Ceasar, Stanislaus; Sohn, Soo-In; Ramesh, Manikandan
- Abstract
Salt stress is a major abiotic stress that exerts detrimental effects on plant growth, development and yield worldwide. Humic acid (HA) is a naturally occurring component of soil and a major element of biostimulant (BS). It has the potential to alleviate different abiotic stresses in plants effectively. However, the putative physiological mechanism underlying HA-alleviated salt stress in finger millet is unknown. The possible role of HA in improving finger millet salt stress resistance was investigated through a physiological, biochemical and molecular analysis. The results showed that HA improved growth, leaf relative water content (LRWC), and photosynthetic pigment in finger millet under salt stress. Meanwhile, HA mitigated salt-induced oxidative stress by decreasing lipid peroxidation and generating reactive oxygen species through an enhanced antioxidant system. Particularly, HA increased the activity of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) via transcriptional regulation of EcSOD, EcCAT1, EcAPX1, and EcGR. Our results suggested that HA treatment might protect finger millet seedlings from salt stress while reducing oxidative stress by enhancing the ROS scavenging pathway gene expression. This is the first report on the use of HA to mitigate salt stress damage in finger millet by upregulating the expression of antioxidant enzyme genes such as EcSOD, EcCAT1, EcAPX, and EcGR. This study will help us understand the mechanism of HA's role in finger millet salt tolerance.
- Subjects
RAGI; HUMIC acid; GENE expression; OXIDATIVE stress; GLUTATHIONE reductase
- Publication
Cereal Research Communications, 2024, Vol 52, Issue 2, p397
- ISSN
0133-3720
- Publication type
Article
- DOI
10.1007/s42976-023-00429-8