scholarly journals Biochemical basis of heavy metal induced stress tolerance in the N2 fixing cyanobacterium Anabaena doliolum

2007 ◽  
Vol 8 (1) ◽  
Author(s):  
P Sultan ◽  
S M Shah ◽  
P Williams ◽  
A Jan ◽  
N Ahmad
Keyword(s):  
Heavy Metal ◽  
Stress Tolerance ◽  
Anabaena Doliolum ◽  
Biochemical Basis ◽  
Induced Stress

scholarly journals Melatonin confers heavy metal-induced tolerance by alleviating oxidative stress and reducing the heavy metal accumulation in Exophiala pisciphila, a dark septate endophyte (DSE)

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yang Yu ◽  
Zhaowei Teng ◽  
Zongmin Mou ◽  
Yan Lv ◽  
Tao Li ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Heavy Metal ◽  
Stress Tolerance ◽  
Metal Accumulation ◽  
Heavy Metal Accumulation ◽  
Biosynthetic Enzyme ◽  
Dark Septate Endophyte ◽  
Induced Stress ◽  
Exophiala Pisciphila

Abstract Background Melatonin (MT), ubiquitous in almost all organisms, functions as a free radical scavenger. Despite several reports on its role as an antioxidant in animals, plants, and some microorganisms, extensive studies in filamentous fungi are limited. Based upon the role of melatonin as an antioxidant, we investigated its role in heavy metal-induced stress tolerance in Exophiala pisciphila, a dark septate endophyte (DSE), by studying the underlying mechanisms in alleviating oxidative stress and reducing heavy metal accumulation. Results A significant decrease in malondialdehyde (MDA) and oxygen free radical (OFR) in E. pisciphila was recorded under Cd, Zn, and Pb stresses as compared to the control. Pretreatment of E. pisciphila with 200.0 μM exogenous melatonin significantly increased the activity of superoxide dismutase (SOD) under Zn and Pb stresses. Pretreatment with 200.0 μM melatonin also lowered Cd, Zn, and Pb concentrations significantly. Melatonin production was enhanced by Cd, Cu, and Zn after 2 d, and melatonin biosynthetic enzyme genes, E. pisciphila tryptophan decarboxylase (EpTDC1) and serotonin N-acetyltransferase (EpSNAT1), were transcriptionally upregulated. The overexpression of EpTDC1 and N-acetylserotonin O-methyltransferase (EpASMT1) in Escherichia coli and Arabidopsis thaliana enhanced its heavy metal-induced stress tolerance. The overexpression of EpTDC1 and EpASMT1 reduced the Cd accumulation in the whole A. thaliana plants, especially in the roots. Conclusions Melatonin conferred heavy metal-induced stress tolerance by alleviating oxidative stress, activating antioxidant enzyme SOD, and reducing heavy metal accumulation in E. pisciphila. Melatonin biosynthetic enzyme genes of E. pisciphila also played key roles in limiting excessive heavy metal accumulation in A. thaliana. These findings can be extended to understand the role of melatonin in other DSEs associated with economically important plants and help develop new strategies in sustainable agriculture practice where plants can grow in soils contaminated with heavy metals.

scholarly journals Melatonin confers heavy metal-induced tolerance by alleviating oxidative stress and reducing the heavy metal accumulation in Exophiala pisciphila, a dark septate endophyte (DSE)

2020 ◽  
Author(s):  
Yang Yu ◽  
Zhaowei Teng ◽  
Zongmin Mou ◽  
Yan Lv ◽  
Tao Li ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Heavy Metal ◽  
Stress Tolerance ◽  
Metal Accumulation ◽  
Heavy Metal Accumulation ◽  
Biosynthetic Enzyme ◽  
Dark Septate Endophyte ◽  
Induced Stress ◽  
Exophiala Pisciphila

Abstract Background: Melatonin (MT), ubiquitous in almost all organisms, functions as a free radical scavenger. Despite several reports on its role as an antioxidant in animals, plants, and some microorganisms, extensive studies in filamentous fungi are limited. Based upon the role of melatonin as an antioxidant, we investigated its role in heavy metal-induced stress tolerance in Exophiala pisciphila, a dark septate endophyte (DSE), by studying the underlying mechanisms in alleviating oxidative stress and reducing heavy metal accumulation.Results: A significant decrease in malondialdehyde (MDA) and oxygen free radical (OFR) in E. pisciphila was recorded under Cd, Zn, and Pb stresses as compared to the control. Pretreatment of E. pisciphila with 200.0 μM exogenous melatonin significantly increased the activity of superoxide dismutase (SOD) under Zn and Pb stresses. Pretreatment with 200.0 μM melatonin also lowered Cd, Zn, and Pb concentrations significantly. Melatonin production was enhanced by Cd, Cu, and Zn after 2 d, and melatonin biosynthetic enzyme genes, E. pisciphila tryptophan decarboxylase (EpTDC1) and serotonin N-acetyltransferase (EpSNAT1), were transcriptionally upregulated. The overexpression of EpTDC1 and N-acetylserotonin O-methyltransferase (EpASMT1) in Escherichia coli and Arabidopsis thaliana enhanced its heavy metal-induced stress tolerance. The overexpression of EpTDC1 and EpASMT1 reduced the Cd accumulation in the whole A. thaliana plants, especially in the roots.Conclusions: Melatonin conferred heavy metal-induced stress tolerance by alleviating oxidative stress, activating antioxidant enzyme SOD, and reducing heavy metal accumulation in E. pisciphila. Melatonin biosynthetic enzyme genes of E. pisciphila also played key roles in limiting excessive heavy metal accumulation in A. thaliana. These findings can be extended to understand the role of melatonin in other DSEs associated with economically important plants and help develop new strategies in sustainable agriculture practice where plants can grow in soils contaminated with heavy metals.

5-Aminolevulinic Acid-Induced Heavy Metal Stress Tolerance and Underlying Mechanisms in Plants

2018 ◽  
Vol 37 (4) ◽  
pp. 1423-1436 ◽  
Author(s):  
Shafaqat Ali ◽  
Muhammad Rizwan ◽  
Abbu Zaid ◽  
Muhammad Saleem Arif ◽  
Tahira Yasmeen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Stress Tolerance ◽  
Aminolevulinic Acid ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Underlying Mechanisms

scholarly journals The promotion of Festuca sinensis heavy metal stress tolerance mediated by Epichloë endophyte

2020 ◽  
Author(s):  
Meining Wang ◽  
Pei Tian ◽  
Min Gao ◽  
Miaomiao Li
Keyword(s):  
Heavy Metal ◽  
Stress Tolerance ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Control Treatment ◽  
Hormone Production ◽  
Higher Plant ◽  
Positive Effects ◽  
Host Growth ◽  
Epichloë Endophyte

Abstract Background: Festuca sinensis is a perennial grass of the genus Festuca, which has strong stress tolerance and high adaptability. F. sinensis normally symbiotic with Epichloë endophyte. In order to evaluate the possibility of F. sinensis-endophyte association as bioremediation grass in heavy metal polluted soils, the effects and mechanism of the F. sinensis-endophyte interaction under heavy metal stress was investigated. Results: The growth performance and physiology variations of F. sinensis with (E+) and without endophyte (E-) were evaluated after they were subjected to Zn2+ and Cd2+ treatments. The results showed that heavy metal treatments had significant effects on plants as the growth indices of plants under Zn2+ and Cd2+ treatments had significant differences compared with plants under control treatment (P<0.05). Zn2+ treatment had positive effects on plants whereas Cd2+ treatment had negative effects. The plants under Cd2+ treatment produced more lolitrem B (P<0.05). Endophyte increased host heavy metal stress tolerance by promoting host growth as the E+ plants had significantly higher plant height, tiller number, root length (P<0.05). Endophyte also promoted host Zn2+ ion absorbing and induced more endogenous hormone production (P<0.05). Conclusions: These results suggested that Epichloë regulated host growth and physiology to improve association tolerance to environmental conditions.

Serendipita indica Mediated Drought and Heavy Metal Stress Tolerance in Plants

2021 ◽  
pp. 181-194
Author(s):  
Surbhi Dabral ◽  
Ajit Varma ◽  
Deepesh Bhatt ◽  
Manoj Nath
Keyword(s):  
Heavy Metal ◽  
Stress Tolerance ◽  
Heavy Metal Stress ◽  
Metal Stress

Advances in Heavy Metal-Induced Stress Alleviation with Respect to Exogenous Amendments in Crop Plants

2019 ◽  
pp. 313-332 ◽  
Author(s):  
Bedabrata Saha ◽  
Bhaben Chowardhara ◽  
Saradia Kar ◽  
Sanjenbam Sanjibia Devi ◽  
Jay Prakash Awasthi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Crop Plants ◽  
Stress Alleviation ◽  
Induced Stress

Heavy metal-induced stress in rice crops detected using multi-temporal Sentinel-2 satellite images

2018 ◽  
Vol 637-638 ◽  
pp. 18-29 ◽  
Author(s):  
Meiling Liu ◽  
Tiejun Wang ◽  
Andrew K. Skidmore ◽  
Xiangnan Liu
Keyword(s):  
Heavy Metal ◽  
Satellite Images ◽  
Induced Stress ◽  
Multi Temporal ◽  
Sentinel 2
Sign in / Sign up

Export Citation Format

Share Document