scholarly journals Exogenous Glycine Betaine Reduces Drought Damage by Mediating Osmotic Adjustment and Enhancing Antioxidant Defense in Phoebe hunanensis

Phyton ◽  
2022 ◽  
Vol 91 (1) ◽  
pp. 129-148
Author(s):  
Yujie Yang ◽  
Chengshi Huang ◽  
Zuguo Ge ◽  
Bengeng Zhou ◽  
Guangju Su ◽  
...  
Keyword(s):  
Osmotic Adjustment ◽  
Glycine Betaine ◽  
Antioxidant Defense ◽  
Drought Damage

scholarly journals Differential Effects of Glycine Betaine and Spermidine on Osmotic Adjustment and Antioxidant Defense Contributing to Improved Drought Tolerance in Creeping Bentgrass

2017 ◽  
Vol 142 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Nanqing Liu ◽  
Shaoyan Lin ◽  
Bingru Huang
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Osmotic Adjustment ◽  
Glycine Betaine ◽  
Antioxidant Defense ◽  
Foliar Application ◽  
Creeping Bentgrass ◽  
Antioxidant Enzyme Activities ◽  
Antioxidant Metabolism ◽  
Exogenous Application

Glycine betaine (GB) and spermidine (Spd) are known to play roles in plant adaptation to stresses that induce dehydration, including drought stress. The objectives of this study were to examine whether improved drought tolerance by exogenous application of GB or Spd is associated with the increases in the endogenous accumulation of those solutes under drought stress in cool-season turfgrass species, and to determine the relative effects of those solutes on osmotic adjustment (OA) and antioxidant metabolism for improving drought tolerance. Creeping bentgrass (Agrostis stolonifera cv. Penncross) plants were treated with 200 mm GB or 0.1 mm Spd for 3 weeks by weekly foliar application before the exposure to drought stress; those plants were subsequently subjected to drought stress by withholding irrigation. The endogenous content of GB and Spd increased significantly through the exogenous application of either compound, to a greater magnitude for GB. The comparison of GB- or Spd-treated plants to untreated plants exposed to drought stress for growth [turf quality (TQ)] and physiological responses (water relations, membrane stability, and antioxidant metabolism) demonstrated that both compounds led to significant improvement in drought tolerance in creeping bentgrass. The improved drought tolerance by exogenous GB could be due to its contribution to OA by significant accumulation of endogenous GB, and activation of antioxidant enzymes with the greatest effects on ascorbate peroxidase (APX). Exogenous Spd did not cause increases in leaf OA despite of the increased endogenous accumulation, but significantly enhanced antioxidant enzyme activities, with the most pronounced effects on catalase (CAT). This study demonstrated that GB and Spd had different effects on OA and activated different antioxidant defense pathways, protecting plants from drought damages in creeping bentgrass.

scholarly journals Effects of Exogenous Application of Osmotic Adjustment Substances on Growth, Pigment Concentration, and Physiological Parameters of Dracaena sanderiana Sander under Different Levels of Salinity

Agronomy ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 125 ◽  
Author(s):  
Pedro García-Caparrós ◽  
Alfonso Llanderal ◽  
Elodie Hegarat ◽  
María Jiménez-Lao ◽  
María Teresa Lao
Keyword(s):  
Osmotic Adjustment ◽  
Glycine Betaine ◽  
Foliar Application ◽  
Stomatal Density ◽  
Soluble Sugars ◽  
Physiological Parameters ◽  
Clear Trend ◽  
Exogenous Application ◽  
Mode Of Application ◽  
Dracaena Sanderiana

We evaluated two osmotic adjustment substances (glycine betaine (GB) and glycine (G) and a combination of both glycine + glycine betaine (G + GB) using two modes of application; irrigation and foliar sprays with Dracaena sanderiana plants. The plants were grown in containers and subjected to two levels of NaCl concentrations (2.0 and 7.5 dS m−1) over 8 weeks. Growth, pigment concentrations, and physiological parameters were assessed at the end of the trial. The foliar application of GB resulted in most optimal plant growth and biomass production in the presence of NaCl. The chlorophyll and carotenoid concentrations showed different trends depending on the osmotic adjustment substance applied and the mode of application. Stomatal density and dimensions varied considerably with respect to the osmotic adjustment substance supplied. The concentration of soluble sugars in leaves did not show a clear trend under the different treatments assessed. The exogenous application of G resulted in the highest concentration of free proline and proteins in leaves. The antioxidant capacity in leaves increased with both osmotic adjustment substances, and both means of application, under low and high saline conditions. We concluded that the foliar application of GB can be recommended in order to achieve cost-effective growth of D. sanderiana under saline conditions.

scholarly journals Exogenous Methyl Jasmonate Improves Heat Tolerance of Perennial Ryegrass Through Alteration of Osmotic Adjustment, Antioxidant Defense, and Expression of Jasmonic Acid-Responsive Genes

2021 ◽  
Vol 12 ◽  
Author(s):  
Yanning Su ◽  
Yizhi Huang ◽  
Xintan Dong ◽  
Ruijia Wang ◽  
Mingyu Tang ◽  
...  
Keyword(s):  
Heat Stress ◽  
Jasmonic Acid ◽  
Heat Tolerance ◽  
Perennial Ryegrass ◽  
Osmotic Adjustment ◽  
Antioxidant Defense ◽  
Grass Species ◽  
Positive Role ◽  
Heat Condition ◽  
Study Results

Perennial ryegrass (Lolium perenne L.) is an important cool-season grass species that is widely cultivated in temperate regions worldwide but usually sensitive to heat stress. Jasmonates (JAs) may have a positive effect on plant tolerance under heat stress. In this study, results showed that exogenous methyl jasmonic acid (MeJA) could significantly improve heat tolerance of perennial ryegrass through alteration of osmotic adjustment, antioxidant defense, and the expression of JA-responsive genes. MeJA-induced heat tolerance was involved in the maintenance of better relative water content (RWC), the decline of chlorophyll (Chl) loss for photosynthetic maintenance, as well as maintained lower electrolyte leakage (EL) and malondialdehyde (MDA) content under heat condition, so as to avoid further damage to plants. Besides, results also indicated that exogenous MeJA treatment could increase the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX), thus enhancing the scavenging ability of reactive oxygen species, alleviating the oxidative damage caused by heat stress. Heat stress and exogenous MeJA upregulated transcript levels of related genes (LpLOX2, LpAOC, LpOPR3, and LpJMT) in JA biosynthetic pathway, which also could enhance the accumulation of JA and MeJA content. Furthermore, some NAC transcription factors and heat shock proteins may play a positive role in enhancing resistance of perennial ryegrass with heat stress.

Glycine betaine application modifies biochemical attributes of osmotic adjustment in drought stressed wheat

2013 ◽  
Vol 72 (3) ◽  
pp. 221-228 ◽  
Author(s):  
Neha Gupta ◽  
Sanjeev Kaur Thind ◽  
Navtej Singh Bains
Keyword(s):  
Osmotic Adjustment ◽  
Glycine Betaine
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