scholarly journals Abscisic acid signalling reduced transpiration flow, regulated Na+ ion homeostasis and antioxidant enzyme activities to induce salinity tolerance in wheat (Triticum aestivum L.) seedlings

2021 ◽  
pp. 101808
Author(s):  
Aasma Parveen ◽  
Sunny Ahmar ◽  
Muhammad Kamran ◽  
Zaffar Malik ◽  
Ahmad Ali ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Abscisic Acid ◽  
Antioxidant Enzyme ◽  
Salinity Tolerance ◽  
Enzyme Activities ◽  
Ion Homeostasis ◽  
Triticum Aestivum L ◽  
Antioxidant Enzyme Activities

scholarly journals Study of silicon effects on antioxidant enzyme activities and osmotic adjustment of wheat under drought stress

2011 ◽  
Vol 47 (No. 1) ◽  
pp. 17-27 ◽  
Author(s):  
S. Tale Ahmad ◽  
R. Haddad
Keyword(s):  
Drought Stress ◽  
Antioxidant Enzyme ◽  
Osmotic Adjustment ◽  
Enzyme Activities ◽  
Soluble Protein ◽  
Membrane Damage ◽  
Triticum Aestivum L ◽  
Growth Stages ◽  
Antioxidant Enzyme Activities ◽  
Randomized Design

The effect of silicon (Si) was investigated on the major antioxidant enzyme activities including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), peroxidase (POD), relative water content (RWC), chlorophyll and soluble protein contents, proline (Pro) and glycine betaine (GB) accumulation in three different growth stages (2<sup>nd</sup>, 4<sup>th</sup> leaf and tillering stages) of wheat (Triticum aestivum L.) plants under drought stress. The experiment was performed in a completely randomized design for three treatments including control, drought and Si-drought (2mM silicate sodium/kg) with three replications in a greenhouse. The results indicated that Si partially offset the negative impacts of drought stress increasing the tolerance of wheat by rising Pro and GB accumulation and soluble protein content. Compared with the plants treated with drought, applied Si significantly enhanced the activities of SOD, CAT, APX and POD. In contrast, drought stress caused a considerable decrease in RWC, chlorophyll and soluble protein contents. This Si effect was time-dependent and became stronger in the tillering stage. The results of the present experiment coincided with the conclusion that Si alleviates water deficit of wheat by preventing the oxidative membrane damage and may be associated with plant osmotic adjustment.

scholarly journals Synthesis of Abscisic Acid in Neopyropia yezoensis and Its Regulation of Antioxidase Genes Expressions Under Hypersaline Stress

2022 ◽  
Vol 12 ◽  
Author(s):  
Jiali Yang ◽  
Wenhui Gu ◽  
Zezhong Feng ◽  
Bin Yu ◽  
Jianfeng Niu ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Antioxidant Enzyme ◽  
Signaling Pathway ◽  
Enzyme Activities ◽  
Target Genes ◽  
Higher Plants ◽  
Antioxidant Enzyme Activities ◽  
Aba Signaling ◽  
Exogenous Aba ◽  
Hypersaline Stress

Abscisic acid (ABA) is regarded as crucial for plant adaptation to water-limited conditions and it functions evolutionarily conserved. Thus, insights into the synthesis of ABA and its regulation on downstream stress-responsive genes in Neopyropia yezoensis, a typical Archaeplastida distributed in intertidal zone, will improve the knowledge about how ABA signaling evolved in plants. Here, the variations in ABA contents, antioxidant enzyme activities and expression of the target genes were determined under the presence of exogenous ABA and two specific inhibitors of the ABA precursor synthesis. ABA content was down-regulated under the treatments of each or the combination of the two inhibitors. Antioxidant enzyme activities like SOD, CAT and APX were decreased slightly with inhibitors, but up-regulated when the addition of exogenous ABA. The quantitative assays using real-time PCR (qRT-PCR) results were consistent with the enzyme activities. All the results suggested that ABA can also alleviate oxidative stress in N. yezoensis as it in terrestrial plant. Combined with the transcriptome assay, it was hypothesized that ABA is synthesized in N. yezoensis via a pathway that is similar to the carotenoid pathway in higher plants, and both the MVA and that the MEP pathways for isoprenyl pyrophosphate (IPP) synthesis likely exist simultaneously. The ABA signaling pathway in N. yezoensis was also analyzed from an evolutionary standpoint and it was illustrated that the emergence of the ABA signaling pathway in this alga is an ancestral one. In addition, the presence of the ABRE motif in the promoter region of antioxidase genes suggested that the antioxidase system is regulated by the ABA signaling pathway.

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