Drought stress has contrasting effects on antioxidant enzymes activity and phenylpropanoid biosynthesis in Fraxinus ornus leaves: An excess light stress affair?

2012 ◽  
Vol 169 (10) ◽  
pp. 929-939 ◽  
Author(s):  
Alessio Fini ◽  
Lucia Guidi ◽  
Francesco Ferrini ◽  
Cecilia Brunetti ◽  
Martina Di Ferdinando ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Drought Stress ◽  
Light Stress ◽  
Enzymes Activity ◽  
Phenylpropanoid Biosynthesis ◽  
Excess Light

scholarly journals Role of hydrogen peroxide and the redox state of ascorbate in the induction of antioxidant enzymes in pea leaves under excess light stress

2004 ◽  
Vol 31 (4) ◽  
pp. 359 ◽  
Author(s):  
Jose A. Hernández ◽  
Carolina Escobar ◽  
Gary Creissen ◽  
Phil M. Mullineaux
Keyword(s):  
Antioxidant Enzymes ◽  
Redox State ◽  
Light Stress ◽  
Redox Status ◽  
Protein Accumulation ◽  
Photoinhibition Of Photosynthesis ◽  
Transcript Accumulation ◽  
Land Race ◽  
Excess Light

In this work we used two different pea cultivars, JI281 is a semidomesticated land race of pea from Ethiopia whereas JI399 is a typical domesticated pea variety. Exposure of pea leaves to excess light (EL) for 1 h caused a reversible photoinhibition of photosynthesis as showed by changes in Fv / Fm. Although little difference existed between the two pea genotypes with respect to photoinhibition, after 60 min of EL the decline in Fv / Fm was higher in JI281 than in JI399 leaves. As a consequence of EL, H2O2 increased in both pea cultivars, whereas lipid peroxidation and protein oxidation slightly increased, although differences between cultivars were minimal. The redox state of ascorbate shifted towards its oxidized form under EL stress in both cultivars. Transcript levels of genes coding antioxidant enzymes varied with EL in both cultivars, but the response was more pronounced in JI399. The induction observed during EL was maintained or increased after the stress period, as occurred for cytGR and chlMDHAR. GR protein accumulation and activity correlated with the transcript accumulation in JI399, but not in JI288. In this work, a possible role for H2O2 and redox status of ascorbate in the photoxidative stress signalling is discussed.

Effect of drought stress on the morphology and antioxidant enzymes activity of Foeniculum vulgare cultivars in Sistan

2018 ◽  
Vol 23 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Zohreh Poudineh ◽  
Brat Ali Fakheri ◽  
Ali Reza Sirosmehr ◽  
Saeed Shojaei
Keyword(s):  
Antioxidant Enzymes ◽  
Drought Stress ◽  
Foeniculum Vulgare ◽  
Enzymes Activity

scholarly journals Comparative Physiological, Biochemical and Transcript Response to Drought in Sorghum Genotypes

2020 ◽  
pp. 1-14 ◽  
Author(s):  
Joseph Noble Amoah ◽  
Daniel Antwi-Berko
Keyword(s):  
Antioxidant Enzymes ◽  
Drought Stress ◽  
Metabolic Response ◽  
Block Design ◽  
Soluble Sugar ◽  
Yield Reduction ◽  
Specific Response ◽  
Tropical Regions ◽  
Enzymes Activity ◽  
Sorghum Genotypes

Sorghum [Sorghum bicolor (L.) Moench] is considered as an important staple crop in the tropical regions. However, the productivity of this useful crop is hindered by drought which contributes to significant yield reduction. The present study aimed to decipher the effects of drought stress on physiological, biochemical and gene expression changes in sorghum genotypes and to ascertain the differences in their response to drought stress. To achieve these objectives, six sorghum genotypes were grown in pot culture in a greenhouse, in a randomized complete block design and exposed to water stress treatment for 10 days. From the study, drought stress caused a significant (P < .05) reduction in plant height, leaf water and chlorophyll contents while the proline, malondialdehyde (MDA), soluble sugar, electrolyte leakage (EL), hydrogen peroxide (H2O2) and antioxidant enzymes activity increased significantly (P < .05) and differentially in all sorghum genotypes. Among the genotypes investigated, PI 585456 showed enhanced performance and was considered as the most tolerant to drought in relation to plant growth and water relation, membrane status, photosynthetic activity, ROS and osmolytes accumulation and antioxidant enzymes activity. Furthermore, the transcript expression analyses of different categories of drought-responsive genes, viz; antioxidant-related, osmolytes biosynthesis-related, dehydrin-related, photosystem-related and transcription-related were differentially upregulated in sorghum genotypes investigated. The results revealed the differences in metabolic response to drought among the genotypes, which accentuated the physiological, biochemical and molecular mechanism related to a specific response that may play a vital role in drought tolerance in sorghum.

scholarly journals Evaluation of Silicon and Proline Application on the Oxidative Machinery in Drought-Stressed Sugar Beet

Antioxidants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 398
Author(s):  
Muneera D. F. AlKahtani ◽  
Yaser M. Hafez ◽  
Kotb Attia ◽  
Emadeldeen Rashwan ◽  
Latifa Al Husnain ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Drought Stress ◽  
Phenolic Compounds ◽  
Sugar Beet ◽  
Harmful Effect ◽  
Sugar Yield ◽  
Total Phenolic ◽  
Total Phenolic Compounds ◽  
Sod Activity ◽  
Yield Parameters

Drought stress deleteriously affects growth, development and productivity in plants. So, we examined the silicon effect (2 mmol) and proline (10 mmol) individually or the combination (Si + proline) in alleviating the harmful effect of drought on total phenolic compounds, reactive oxygen species (ROS), chlorophyll concentration and antioxidant enzymes as well as yield parameters of drought-stressed sugar beet plants during 2018/2019 and 2019/2020 seasons. Our findings indicated that the root diameter and length (cm), root and shoot fresh weights (g plant−1) as well as root and sugar yield significantly decreased in sugar beet plants under drought. Relative water content (RWC), nitrogen (N), phosphorus (P) and potassium (K) contents and chlorophyll (Chl) concentration considerably reduced in stressed sugar beet plants that compared with control in both seasons. Nonetheless, lipid peroxidation (MDA), electrolyte leakage (EL), hydrogen peroxide (H2O2) and superoxide (O2●−) considerably elevated as signals of drought. Drought-stressed sugar beet plants showed an increase in proline accumulation, total phenolic compounds and up-regulation of antioxidant enzymes catalase (CAT) and superoxide dismutase (SOD) activity to mitigate drought effects. Si and proline individually or the combination Si + proline considerably increased root and sugar yield, sucrose%, Chl concentration and RWC, MDA and EL were remarkably reduced. The treatments led to adjust proline and total phenolic compounds as well as CAT and SOD activity in stressed sugar beet plants. We concluded that application of Si + proline under drought stress led to improve the resistance of sugar beet by regulating of proline, antioxidant enzymes, phenolic compounds and improving RWC, Chl concentration and Nitrogen, Phosphorus and Potassium (NPK) contents as well as yield parameters.

Sign in / Sign up

Export Citation Format

Share Document