Abscisic acid improves drought tolerance of triploid bermudagrass and involves H2O2- and NO-induced antioxidant enzyme activities

2009 ◽  
Vol 47 (2) ◽  
pp. 132-138 ◽  
Author(s):  
Shaoyun Lu ◽  
Wei Su ◽  
Haihang Li ◽  
Zhenfei Guo
Keyword(s):  
Abscisic Acid ◽  
Drought Tolerance ◽  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Antioxidant Enzyme Activities ◽  
Triploid Bermudagrass

Effect of atmospheric CO2 enrichment on the drought response of barley, durum wheat and oat

2013 ◽  
Vol 61 (2) ◽  
pp. 91-100 ◽  
Author(s):  
S. Bencze ◽  
K. Balla ◽  
T. Janda ◽  
O. Veisz
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Durum Wheat ◽  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Winter Barley ◽  
Antioxidant Enzyme Activities ◽  
Severe Drought ◽  
The Impact

Phytotron experiments were conducted to examine the impact of elevated atmospheric CO2 level (750 μmol mol−1) on the drought tolerance of winter barley (Petra), durum wheat (Mv Makaroni) and spring oat (Mv Pehely) varieties. Under drought stress conditions, the durum wheat variety was found to be unaffected by CO2 enrichment, as neither the biomass or grain yield nor the antioxidant enzyme activities changed compared to those at ambient CO2. Despite the fact that the spring oat variety had similar grain yield loss due to drought at both CO2 levels, it exhibited reduced antioxidant enzyme activities under less severe drought, indicating a slightly increased tolerance to drought. Winter barley, which exhibited an extremely positive reaction to CO2 enrichment at the control water supply level, also showed increased drought tolerance in response to high CO2. It had low glutathione reductase, glutathione-S-transferase and ascorbate peroxidase activities even at the most severe drought stress levels, while it could also fully compensate for the negative effects of drought on biomass and grain yield parameters when grown at elevated CO2.

Overexpression of a novel E3 ubiquitin ligase gene from Coptis chinensis Franch enhances drought tolerance in transgenic tobacco

2020 ◽  
Vol 75 (11-12) ◽  
pp. 417-424
Author(s):  
Hanting Chen ◽  
Junjun Li ◽  
Yang He
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Antioxidant Enzyme ◽  
Transgenic Tobacco ◽  
Ubiquitin Ligase ◽  
Enzyme Activities ◽  
E3 Ubiquitin Ligase ◽  
Antioxidant Enzyme Activities ◽  
Wild Type ◽  
Coptis Chinensis

AbstractDrought stress has a significant effect on the growth, physiology and biochemistry of medicinal plants. SDIR1 (Salt- and Drought-Induced Ring Finger1), a C3H2C3-type RING-finger E3 ubiquitin ligase gene plays an important role in the stress response of various plants. However, the role of this gene is not clear in Coptis chinensis. In this study, the CcSDIR1 gene was cloned from C. chinensis using RACE and RT-PCR. Sequence analysis revealed that CcSDIR1 had an open reading frame of 840 bp that encodes 279 amino acids with a theoretical molecular weight about 31 kDa and pI value of 5.65 and shared conserved domains with other plants. On comparison with the wild-type plants, overexpression of CcSDIR1 in transgenic tobaccos increased drought tolerance and showed better growth performance. However, lower malondialdehyde contents and high antioxidant enzyme activities were observed in transgenic tobacco plants compared to wild-type plants. In addition, Evans blue staining showed high cell viability of transgenic lines under drought stress. These results suggest that CcSDIR1 regulates various responses to drought stress by increasing antioxidant enzyme activities and reducing oxidative damage. From the study results, the CcSDIR1 gene will be very useful for drought stress research in plants.

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.

scholarly journals Exogenously Applied Proline Modulates Drought Tolerance in Maize (Zea mays L)

2021 ◽  
pp. 198-212
Author(s):  
Shamim Akram ◽  
Mohammad Golam Kibria ◽  
Yoshiyuki Murata ◽  
Md. Anamul Hoque
Keyword(s):  
Zea Mays ◽  
Drought Tolerance ◽  
Antioxidant Enzyme ◽  
Water Deficit ◽  
Enzyme Activities ◽  
Zea Mays L ◽  
Growth And Yield ◽  
Water Deficit Stress ◽  
Antioxidant Enzyme Activities ◽  
Maize Varieties

Improving drought stress tolerance in maize is essential to increase its production and yield worldwide.  Thus, the present study was conducted to investigate the improvement of drought tolerance in maize (Zea mays L.) by exogenous application of proline (25 and 50mM) on two maize varieties. Maize plants were subjected to drought stress at various phases of plant growth under pot culture conditions and proline was applied as foliar spray. Water deficit stress caused a significant decrease (by approximately 25%) in growth and yield of both maize varieties by decreasing plant height, cob length, dry root weight, grains per cob and 100-grain weight. Water deficit stress also decreased chlorophyll and intercellular proline contents, and antioxidant enzyme activities viz. catalase (CAT), guaiacol peroxidase (POX) and ascorbate peroxidase (APX). Exogenous application of proline (50 mM) was found to be more effective in increasing growth and yield of both varieties. These increases were positively associated with increased levels (by at least 15%) of chlorophyll and intracellular proline, and enhanced activities of CAT, POX and APX enzymes in both varieties. Interaction effects of exogenous proline and water deficit stress were significant in aspects of higher growth and yields and enhanced levels of chlorophyll, intracellular proline and antioxidant enzyme activities. Therefore, it is concluded that foliar application of proline improves drought tolerance by modulating chlorophyll and intracellular proline contents, and antioxidant enzyme activities.

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