scholarly journals Physiological and Antioxidant Parameters in Two Lycoris Species as Influenced by Water Deficit Stress

HortScience ◽  
2015 ◽  
Vol 50 (11) ◽  
pp. 1702-1708 ◽  
Author(s):  
Sheng Xu ◽  
Mingmin Jiang ◽  
Jiangyan Fu ◽  
Lijian Liang ◽  
Bing Xia ◽  
...  
Keyword(s):  
Antioxidant Enzyme ◽  
Water Deficit ◽  
Enzyme Activities ◽  
Water Status ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Net Photosynthesis ◽  
Water Deficit Stress ◽  
Antioxidant Enzyme Activities ◽  
Guaiacol Peroxidase

From a field experiment, the changes in morphophysiological characters and antioxidant enzyme activities were studied in two Lycoris species (Lycoris radiata and Lycoris aurea) subjected to 16 days of water deficit stress. With the increase of water deficit stress processing time, leaf relative water content (RWC), membrane stability index (MSI), net photosynthesis (Pn), stomatal conductance (gS), transpiration rate (E), and chlorophyll (Chl) content decreased in both studied species. The water use efficiency (WUE) showed an opposite tendency between the two species under water deficit stress, where WUE of L. aurea decreased moderately and WUE of L. aurea increased somehow. Intercellular CO2 concentration (Ci) in L. aurea and L. radiata decreased in respond to water deficit stress at early stages of stress treatment, then increased throughout the rest of the stress period, and reached levels higher than those in well-watered plants at the end of the treatment. In addition, there was a significant increment in soluble sugar content and proline accumulation under water deficit stress in both species, and L. radiata showed a much more accumulation. The activity of superoxide dismutase (SOD), guaiacol peroxidase (POD), and ascorbate peroxidase (APX) increased in both plants subjected to water deficit stress while declined as the stress time increased. In L. aurea, catalase (CAT) showed a sustained increment, but it responded later and after a transient increase declined again in L. radiata under water deficit stress. In conclusion, L. radiata was more tolerant to water deficit stress than L. aurea as evidenced by its relatively higher water status, higher levels of proline, soluble sugar and pigments, and stronger photoprotection. Moreover, relatively higher antioxidant enzyme activities and lower levels of thiobarbituric acid reactive substances (TBARS) in L. radiata were also associated with its better protection against water deficit stress-induced oxidative damage.

scholarly journals Physiological responses of peanut (Arachis hypogaea L.) cultivars to water deficit stress: status of oxidative stress and antioxidant enzyme activities

2015 ◽  
Vol 74 (1) ◽  
pp. 123-142 ◽  
Author(s):  
Koushik Chakraborty ◽  
Amrit L. Singh ◽  
Kuldeep A. Kalariya ◽  
Nisha Goswami ◽  
Pratap V. Zala
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Enzymes ◽  
Antioxidant Enzyme ◽  
Water Deficit ◽  
Chlorophyll A ◽  
Enzyme Activities ◽  
Carotenoid Content ◽  
Water Deficit Stress ◽  
Antioxidant Enzyme Activities ◽  
Pod Development

AbstractFrom a field experiment, the changes in oxidative stress and antioxidant enzyme activities were studied in six Spanish peanut cultivars subjected to 25−30 days of water deficit stress at two different stages: pegging and pod development stages. Imposition of water deficit stress significantly reduced relative water content, membrane stability and total carotenoid content in all the cultivars, whereas total chlorophyll content increased at pegging stage but decreased at pod developmental stage. Chlorophyll a/b ratio increased under water deficit stress in most of the cultivars suggesting a greater damage to chlorophyll b rather than an increase in chlorophyll a content. Oxidative stress measured in terms of H2O2, superoxide radical content and lipid peroxidation increased under water deficit stress, especially in susceptible cultivars such as DRG 1, AK 159 and ICGV 86031. Relationship among different physiological parameters showed that the level of oxidative stress, in terms of production of reactive oxygen species, was negatively correlated with activities of different antioxidant enzymes such as superoxide dismutase, catalase, peroxidase, ascorbate peroxidase and glutathione reductase. In conclusion, the study shows that water deficit stress at pod development stage proved to be more detrimental than at pegging stage. The higher activities of antioxidant enzymes in the tolerant cultivars like ICGS 44 and TAG 24 were responsible for protection of oxidative damage and thus provide better tolerance to water deficit stress.

scholarly journals Wild Relatives of Wheat Respond Well to Water Deficit Stress: A Comparative Study of Antioxidant Enzyme Activities and Their Encoding Gene Expression

Agriculture ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 415
Author(s):  
Alireza Pour-Aboughadareh ◽  
Mansoor Omidi ◽  
Mohammad Reza Naghavi ◽  
Alireza Etminan ◽  
Ali Ashraf Mehrabi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Antioxidant Enzymes ◽  
Antioxidant Enzyme ◽  
Water Deficit ◽  
Water Deficit Stress ◽  
Antioxidant Enzyme Activities ◽  
Guaiacol Peroxidase ◽  
Photosynthetic Parameters ◽  
Relative Expression ◽  
Encoding Genes

Previous studies have revealed that some wild wheat accessions respond well to water deficit treatments and have a good potential in terms of photosynthetic parameters, root system architecture, and several physiological properties. However, the biochemical responses and molecular mechanisms of antioxidant-encoding genes remain to be elucidated. Herein, we investigated the most tolerant accessions from A. crassa, Ae. tauschii, and Ae. cylindrica previously identified from a core collection in previous studies, along with a control variety of bread wheat (T. aestivum cv. Sirvan) through measuring the shoot fresh and dry biomasses; the activities of antioxidant enzymes (including ascorbate peroxidase (APX), catalase (CAT), guaiacol peroxidase (GPX), and peroxidase (POD)); and the relative expression of CAT, superoxide dismutase (MnSOD), and GPX and APX genes under control and water deficit conditions. Water deficit stress caused a significant decrease in the shoot biomasses but resulted in an increase in the activity of all antioxidant enzymes and relative expression of antioxidant enzyme-encoding genes. Principal component analysis showed a strong association between the shoot dry biomass and the activity of CAT, POD, and APX, as well as MnSOD gene expression. Thus, these traits can be used as biomarkers to screen the tolerant plant material in the early growth stage. Taken together, our findings exposed the fact that Ae. tauschii and Ae. crassa respond better to water deficit stress than Ae. cylindrica and a control variety. Furthermore, these accessions can be subjected to further molecular investigation.

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.

scholarly journals Silicon application positively alters pollen grain area, osmoregulation and antioxidant enzyme activities in wheat plants under water deficit conditions

2019 ◽  
Vol 42 (17) ◽  
pp. 2121-2132 ◽  
Author(s):  
Kobra Maghsoudi ◽  
Yahya Emam ◽  
Muhammad Ashraf ◽  
Mohammad Pessarakli ◽  
Mohammad Javad Arvin
Keyword(s):  
Antioxidant Enzyme ◽  
Water Deficit ◽  
Enzyme Activities ◽  
Pollen Grain ◽  
Antioxidant Enzyme Activities

scholarly journals Differences in Physiological Responses of Two Oat (Avena nuda L.) Lines to Sodic-Alkalinity in the Vegetative Stage

Plants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1188
Author(s):  
Liyun Liu ◽  
Nateetorn Petchphankul ◽  
Akihiro Ueda ◽  
Hirofumi Saneoka
Keyword(s):  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Physiological Responses ◽  
Antioxidant Enzyme Activities ◽  
Guaiacol Peroxidase ◽  
Alkaline Salt ◽  
Shoot Height ◽  
Transcript Levels ◽  
Avena Nuda ◽  
Alkalinity Tolerance

Sodic-alkalinity is a more seriously limiting factor in agricultural productivity than salinity. Oat (Avena nuda) is a salt-tolerant crop species and is therefore useful in studying the physiological responses of cereals to alkalinity. We evaluated the differential effects of sodic-alkalinity on two naked oat lines, Caoyou1 and Yanke1. Seedlings of the two lines were exposed to 50 mM alkaline salt mixture of NaHCO3 and Na2CO3 (18:1 molar ratio; pH 8.5) for 2 weeks in a soil environment. Sodic-alkalinity exposure led the assimilation of abundant Na+ at similar concentrations in the organs of both lines. However, Caoyou1 showed much stronger growth than Yanke1, exhibiting a higher dry weight, total leaf area, and shoot height under sodic-alkalinity. Further analysis showed that Caoyou1 was more sodic-alkalinity tolerance than Yanke1. This was firstly because of differences in the oxidative stress defense mechanisms in leaves of the two lines. Antioxidant enzyme activities were either slightly elevated (catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (GP), glutathione reductase (GR)) or unaltered (superoxide dismutase (SOD)) in Caoyou1 leaves, but some enzyme (SOD, GPOX, GR) activities were significantly reduced in Yanke1. AnAPX1 transcript levels significantly increased in Caoyou1 under sodic-alkalinity conditions compared with Yanke1, indicating its better antioxidant capacity. Secondly, the related parameters of Mg2+ concentration, phosphoenolpyruvate carboxylase (PEPC) activity, and AnPEPC transcript levels in the leaves showed significantly higher values in Caoyou1 compared with Yanke1. This demonstrated the effective utilization by Caoyou1 of accumulated HCO3− in the irreversible reaction from phosphoenolpyruvate to oxaloacetate to produce inorganic phosphorus, which was elevated in Caoyou1 leaves under alkalinity stress. Overall, the results demonstrated that the greater sodic-alkalinity tolerance of Caoyou1 is the result of: (1) maintained antioxidant enzyme activities; and (2) a higher capacity for the phosphoenolpyruvate to oxaloacetate reactions, as shown by the higher PEPC activity, Mg2+ concentration, and total phosphorus concentration in its leaves, despite the lower soil pH.

scholarly journals Antioxidant Enzyme Activities and Gene Expression Patterns in Leaves of Kentucky Bluegrass in Response to Drought and Post-drought Recovery

2011 ◽  
Vol 136 (4) ◽  
pp. 247-255 ◽  
Author(s):  
Lixin Xu ◽  
Liebao Han ◽  
Bingru Huang
Keyword(s):  
Gene Expression ◽  
Drought Stress ◽  
Antioxidant Enzyme ◽  
Water Deficit ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Grass Species ◽  
Antioxidant Enzyme Activities ◽  
Guaiacol Peroxidase ◽  
Drought Recovery

The objectives of this study were to examine antioxidant enzyme responses to drought stress and rewatering at both enzymatic activity and transcript levels and to determine the major antioxidant processes associated with drought tolerance and post-drought recovery for a perennial grass species, kentucky bluegrass (Poa pratensis). Antioxidant enzyme responses to drought and rewatering in a drought-tolerant cultivar (Midnight) and a drought-sensitive cultivar (Brilliant) were compared in a growth chamber. Plants were exposed to 22 days of drought stress for ‘Midnight’ and 18 days for ‘Brilliant’ before rewatering to allow the leaf relative water content (RWC) of both cultivars to drop to the same level. ‘Midnight’ exhibited higher photochemical efficiency (Fv/Fm) and lower electrolyte leakage compared with ‘Brilliant’ when at the same water deficit status (26% to 28% RWC). After 6 days of rewatering, all physiological parameters returned to the control level for ‘Midnight’, but only Fv/Fm fully recovered for ‘Brilliant’. The transcript level of cytosolic copper/zinc superoxide dismutase (cyt Cu/Zn SOD) and ascorbate peroxidase (APX) was significantly higher in ‘Midnight’ than in ‘Brilliant’ when exposed to the same level of water deficit (26% to 28% RWC), suggesting that SOD and APX could be involved in scavenging oxidative stress-induced reactive oxygen species in kentucky bluegrass through changes in the level of gene expression. Significantly higher activities of APX, monodehydroascorbate reductase, glutathione reductase, and dehydroascorbate reductase as well as lower lipid peroxidation levels were observed in ‘Midnight’ versus ‘Brilliant’ when exposed to drought. However, the activities of SOD, catalase (CAT), and guaiacol peroxidase (POD) did not differ between the two cultivars. After 6 days of rewatering, ‘Midnight’ displayed significantly higher activity levels of CAT, POD, and APX compared with ‘Brilliant’. The enzyme activity results indicate that enzymes involved in the ascorbate–glutathine cycle may play important roles in antioxidant protection to drought damage, whereas CAT, POD, and APX could be associated with better post-drought recovery in kentucky bluegrass.

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