scholarly journals Effect of N-acetyl-L-cysteine (NAC) on soluble sugar and polyamine content in wheat seedlings exposed to heavy metal stress (Cd, Hg and Pb)

2020 ◽  
Vol 44 (2) ◽  
pp. 191-201
Author(s):  
Nesrin Colak ◽  
Petr Tarkowski ◽  
Faik Ayaz
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Water Potential ◽  
Stress Tolerance ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Wheat Seedlings ◽  
Polyamine Content

Heavy metal stress adversely affects plant growth and productivity worldwide. Alleviating the stress effect through the exogenous use of various chemical substances has become an interesting area of study in the field of plant stress tolerance. As a thiol compound, the cysteine derivative N-acetylcysteine (N-acetyl- L-cysteine, NAC) is the precursor of glutathione synthesis and a potent ROS scavenger with powerful antioxidant and free radical scavenging capabilities. This study investigated the effects of heavy metals (Cd, Hg and Pb, 100 ?M) on accumulation of soluble sugars and polyamine content in roots and shoots of wheat seedlings, the water potential and proline content in shoots and the role of NAC in protection against heavy metal toxicity. The addition of 1 mM NAC significantly increased root content of glucose, fructose and sucrose in varying degrees (avg. 1.34-, 1.20- and 1.51-fold, respectively) in comparison with heavy metals alone. The treatments led to a significant reduction of sugar content in shoots. Water potential values were highly correlated with proline and sugar content in wheat seedling shoots. Heavy metal stress significantly reduced polyamine content in both plant parts. The addition of NAC increased polyamine content in seedlings in comparison with heavy metals alone in both roots and shoots. These results suggest that NAC may protect plants from oxidative stress damage in heavy metal stress, and this enhancement of stress tolerance seems to involve soluble sugar and polyamine biosynthesis.

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

scholarly journals Role of nitric oxide in plant responses to heavy metal stress: exogenous application versus endogenous production

2019 ◽  
Vol 70 (17) ◽  
pp. 4477-4488 ◽  
Author(s):  
Laura C Terrón-Camero ◽  
M Ángeles Peláez-Vico ◽  
Coral Del-Val ◽  
Luisa M Sandalio ◽  
María C Romero-Puertas
Keyword(s):  
Nitric Oxide ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Human Health Risk ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Future Research ◽  
Plant Responses ◽  
Research Perspectives

Abstract Anthropogenic activities, such as industrial processes, mining, and agriculture, lead to an increase in heavy metal concentrations in soil, water, and air. Given their stability in the environment, heavy metals are difficult to eliminate and can constitute a human health risk by entering the food chain through uptake by crop plants. An excess of heavy metals is toxic for plants, which have various mechanisms to prevent their accumulation. However, once metals enter the plant, oxidative damage sometimes occurs, which can lead to plant death. Initial production of nitric oxide (NO), which may play a role in plant perception, signalling, and stress acclimation, has been shown to protect against heavy metals. Very little is known about NO-dependent mechanisms downstream from signalling pathways in plant responses to heavy metal stress. In this review, using bioinformatic techniques, we analyse studies of the involvement of NO in plant responses to heavy metal stress, its possible role as a cytoprotective molecule, and its relationship with reactive oxygen species. Some conclusions are drawn and future research perspectives are outlined to further elucidate the signalling mechanisms underlying the role of NO in plant responses to heavy metal stress.

scholarly journals Activation of phenylpropanoid pathway in legume plants exposed to heavy metals. Part II. Profiling of isoflavonoids and their glycoconjugates induced in roots of lupine (Lupinus luteus) seedlings treated with cadmium and lead.

2011 ◽  
Vol 58 (2) ◽  
Author(s):  
Sylwia Pawlak-Sprada ◽  
Maciej Stobiecki ◽  
Joanna Deckert
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Stress ◽  
Phenylpropanoid Pathway ◽  
Metal Stress ◽  
Lupinus Luteus ◽  
Response To Treatment ◽  
Positional Isomers ◽  
Root Extracts ◽  
Cadmium And Lead

We examined changes in profiles of isoflavonoids in roots of lupine (Lupinus luteus L. cv. Juno) seedlings in response to treatment with two heavy metals: cadmium (at 10 mg/l) and lead (at 150 mg/l). Overall, 21 flavonoid conjugates were identified in root extracts, some of them with up to six positional isomers. The total amount of all isoflavonoids increased by about 15 % in cadmium-treated plants and by 46 % in lead-treated ones. Heavy metals markedly increased the content of two compounds: 2'-hydroxygenistein glucoside and 2'-hydroxygenistein 7-O-glucoside malonylated. Possible functions of the identified isoflavonoids in yellow lupine exposed to heavy metal stress are discussed.

scholarly journals Overexpression of RsMYB1 enhances heavy metal stress tolerance in transgenic petunia by elevating the transcript levels of stress tolerant and antioxidant genes

2018 ◽  
Author(s):  
Trinh Ngoc Ai ◽  
Aung Htay Naing ◽  
Byung-Wook Yun ◽  
Chang Kil Kim
Keyword(s):  
Heavy Metal ◽  
Stress Tolerance ◽  
Sequence Similarity ◽  
Abiotic Stress Tolerance ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Antioxidant Genes ◽  
Resultant Increase ◽  
Anthocyanin Production ◽  
Transgenic Petunia

AbstractThe RsMYB1 transcription factor (TF) controls the regulation of anthocyanin in radish (Raphanus sativus), and its overexpression in tobacco and petunia strongly enhances anthocyanin production. However, no data exists on whether RsMYB1 is involved in the mechanism that leads to abiotic stress tolerance. Under normal conditions, transgenic petunia plants expressing RsMYB1 and WT were able to thrive by producing well-developed broad leaves and regular roots. In contrast, a reduction in plant growth was observed when they were exposed to heavy metals (CuSO4, ZnSO4, MnSO4, and K2Cr2O7). However, RsMYB1-overexpressing plants were found to be more tolerant to the stresses than the WT plants because the expressions of stress tolerant genes (GSH and PCs) and antioxidant genes (SOD, CAT, and POX) were enhanced. In addition, according to the phylogenetic analysis, RsMYB1 has a strong sequence similarity with other MYB TFs that confer different abiotic stresses. These results suggest that overexpression of RsMYB1 enhances the expression levels of metal-induced stress tolerance genes and antioxidant genes, and the resultant increase in gene expression improves heavy metal stress tolerance in petunia.

Emerging Roles of Osmoprotectants in Heavy Metal Stress Tolerance in Plants

2021 ◽  
pp. 95-110
Author(s):  
Akbar Hossain ◽  
Zahoor Ahmad ◽  
Muhammad Adeel ◽  
Md. Atikur Rahman ◽  
Md. Jahangir Alam ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Stress Tolerance ◽  
Heavy Metal Stress ◽  
Metal Stress
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