Role of ASC-GSH Metabolism in Trifolium Repens L

2011 ◽  
Vol 343-344 ◽  
pp. 815-819
Author(s):  
Yong Bao Zhang
Keyword(s):  
Drought Stress ◽  
Water Deficit ◽  
Trifolium Repens ◽  
Monodehydroascorbate Reductase ◽  
Glutathione Disulfide ◽  
Drought Period ◽  
Gsh Metabolism ◽  
Trifolium Repens L ◽  
Positive Effect

In order to elucidate the role of ascorbate-glutathione (ASC-GSH) cycle to drought stress, the activities of antioxidant enzymes and the levels of molecules involved in the ASC-GSH metabolism were studied in Trifolium repens seedlings subjected to polyethylene glycol (PEG)-induced water deficit. Compared to the control, the contents of ascorbate (ASC), dehydroascorbate (DHA) and glutathione disulfide (GSSG) increased in PEG-treated seedlings, whereas the glutathione (GSH) content kept constant during the drought period. Further more, the values of ASC/DHA and GSH/GSSG ratios decreased in the presence of PEG. Except for that of monodehydroascorbate reductase (MDHAR), the activities of ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR) and glutathione reductase (GR) were upregulated during water deficit, and the increases of APX and DHAR activities were much higher than that of GR activity. These data indicated that fluctuations of the ASC-GSH metabolism resulted from PEG may have a positive effect on drought stress mitigation in T. repens, and the antioxidant protection in ASC-GSH cycle can be attributed mainly to ASC, APX and DHAR.

scholarly journals Peroxidases and lignification in relation to the intensity of water-deficit stress in white clover (Trifolium repens L.)

2007 ◽  
Vol 58 (6) ◽  
pp. 1271-1279 ◽  
Author(s):  
B.-R. Lee ◽  
K.-Y. Kim ◽  
W.-J. Jung ◽  
J.-C. Avice ◽  
A. Ourry ◽  
...  
Keyword(s):  
Water Deficit ◽  
White Clover ◽  
Trifolium Repens ◽  
Water Deficit Stress ◽  
Trifolium Repens L

Yield and stolon characteristics of white clover (Trifolium repens L.) cultivars in perennial pasture in Victoria

1997 ◽  
Vol 37 (2) ◽  
pp. 159 ◽  
Author(s):  
S. G. Clark ◽  
M. J. McFadden
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Leaf Size ◽  
Summer Drought ◽  
Sheep Grazing ◽  
Drought Period ◽  
Diverse Range ◽  
Herbage Yield ◽  
Seed Reserves ◽  
Trifolium Repens L

Summary. The herbage yield, stolon characteristics and soil seed reserves of a diverse range of white clover (Trifolium repens L.) cultivars were studied at Hamilton in south-western Victoria. The cultivars were sown with perennial grass (Phalaris aquatica L.) and the pasture was rotationally grazed by sheep. The aim of the study was to identify white clover types which would persist under sheep grazing. The widely used cultivar, Haifa, fails to persist in this environment. Cultivars were divided into 3 groups depending on leaf size (range 2.5–13.0 cm2). Large-leaved cultivars were the most productive in the first year of the experiment but by year 3 some of the intermediate leaf-size cultivars were the most productive. Haifa (large leaved) was particularly unproductive in the third year compared with other large and intermediate leaf-size cultivars. Stolon characteristics were measured in early spring 1987, mid summer 1988 and early autumn 1988. Total stolon yield on each occasion was 0.46–0.99, 0.65–1.68 and 0.05–0.25 t DM/ha respectively. Intermediate leaf- size cultivars tended to have the highest stolon yields on each occasion. Stolon yield declined at the same rate (mean 87%; range 81–92%) in all cultivars between the second and third sampling date indicating that there is no variation in the cultivars’ ability to survive the summer drought period. Although seed reserves for most cultivars were high at the end of the experiment (range 11–130 kg/ha) no seedling recruitment was observed and seed is thought to play no role in sward survival in this environment. Plant breeders developing white clover cultivars for this environment should concentrate on maximising stolon yield at the beginning and end of the summer drought period (January–mid March). Intermediate leaf-size genotypes are likely to provide the best combination of stolon and herbage yield. Grazing management should also aim to maximise stolon yield at these critical times. The use of large-leaved, non-stoloniferous cultivars should be discouraged by advisers as they are not suited to this marginal environment under sheep grazing.

scholarly journals Exogenous application of gibberellic acid mitigates drought-induced damage in spring wheat

2019 ◽  
Vol 72 (2) ◽  
Author(s):  
Moumita ◽  
Jubayer Al Mahmud ◽  
Parimal Kanti Biswas ◽  
Kamrun Nahar ◽  
Masayuki Fujita ◽  
...  
Keyword(s):  
Drought Stress ◽  
Gibberellic Acid ◽  
Defense Mechanisms ◽  
Monodehydroascorbate Reductase ◽  
Dependent Manner ◽  
Glyoxalase System ◽  
Wheat Seedlings ◽  
Glyoxalase Ii ◽  
Physiological And Biochemical

Drought stress is a major problem in wheat production but it could be managed by using various exogenous protectants such as gibberellic acid (GA). Although GA is a plant growth hormone, it shows a potential to protect the plant in stress conditions. To investigate the possible role of GA in mitigating drought stress, we treated wheat (<em>Triticum aestivum</em> ‘BARI Gom-21’) seedlings with a GA spray under semihydroponic conditions. In the experiment, the combined effect of GA and drought stress (induced by 12% polyethylene glycol) was studied after 48 h and 72 h. In the absence of exogenous GA, drought-stressed wheat seedlings showed various physiological and biochemical changes in a time-dependent manner. Malondialdehyde (MDA), hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and free proline (Pro) concentrations were increased, whereas catalase (CAT) and ascorbate peroxidase (APX) activities were reduced under drought stress. Gibberellic acid played a role in restoring the ascorbate (AsA) level, decreased the reduced/oxidized glutathione (GSH/GSSG) ratio and reduced monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) activities. Gibberellic acid significantly affected the glyoxalase system. Under drought stress, the methylglyoxal (MG) concentration was increased but GA application stimulated glyoxalase I (Gly I) and glyoxalase II (Gly II) activities to protect the wheat seedlings against stress. The study concluded that the severity of drought stress in wheat depends on the growth stage and it increases with an increase in the duration of stress, whereas exogenous GA helped the seedlings to survive by upregulating antioxidant defense mechanisms and the glyoxalase system.

scholarly journals Leaf senescence and clonal growth of white clover

1996 ◽  
Vol 6 ◽  
pp. 171-173
Author(s):  
S.M. Butcher ◽  
D.W. Fountain ◽  
M.T. Mcmanus
Keyword(s):  
Leaf Senescence ◽  
White Clover ◽  
Trifolium Repens ◽  
Clonal Growth ◽  
Plant Hormone ◽  
Leaf Tissue ◽  
Physiological Changes ◽  
Genes Encoding ◽  
Trifolium Repens L

Leaf senescence is a programmed event where resources are mobilised from older tissues to the meristematic regions of the plant. In white clover (Trifolium repens L.), leaf and stolon senescence have an important impact on the persistence of the legume in pasture. As part of our investigation of leaf senescence, we have evidence for a central role for the plant hormone ethylene and have identified genes encoding ethylene biosynthetic enzymes. In this paper we include data showing some physiological changes as leaf tissue undergoes senescence and present evidence for the role of ethylene in regulating this process. Keywords: chlorophyll, ethylene, senescence, stolon, leaf, Trifolium repens L.

Influence of Light on Assimilate Partitioning in White Clover (Trifolium repens L.)

1993 ◽  
Vol 20 (3) ◽  
pp. 323 ◽  
Author(s):  
SV Pasumarty ◽  
DW Fountain
Keyword(s):  
Distribution Pattern ◽  
White Clover ◽  
Trifolium Repens ◽  
Assimilate Partitioning ◽  
Trifolium Repens L ◽  
The Relationship ◽  
Clover Plant

In order to identify factors which might contribute to the premature abortion of young inflorescences of white clover Trifolium repens L. in low irradiances, a study was made of the possible role of limiting photosynthetic assimilates to the developing inflorescence. The relationship between the irradiance and distribution pattern of assimilates in the clover plant under different irradiances was determined. Besides driving the photosynthetic supply of sucrose, light seems to play an indirect role in controlling partitioning of photoassimilates. Under low irradiance, the growing tip of the shoot and roots were major sinks and negligible amounts of 14C-labelled assimilates were supplied to the inflorescence. In medium and high irradiances, the inflorescence competes for assimilates with stolon apex and roots.

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