Role of plant dehydrins in antioxidation mechanisms

Sun, Xin; Lin, Honghui

doi:10.2478/s11756-010-0090-y

Cited by 36 publications

(23 citation statements)

References 39 publications

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“…However, plants employ multiple mechanisms to strengthen their protective system, such as the accumulation of soluble sugars, proline, hormones, and antioxidative genes (Koster and Lynch, 1992;Tao et al, 1998). Dehydrins belong to the family of antioxidant genes, which protect the plant against the damaging effects of certain environmental stresses (Close, 1996;Sun and Lin, 2010). To find out whether dehydrin genes are involved in antioxidative mechanisms and thus reinforce the antioxidant enzyme activity of plants, three dehydrin genes and four antioxidant enzymes were analyzed in the present study.…”

Section: Discussionmentioning

confidence: 99%

Study on the expression of dehydrin genes and activities of antioxidativeenzymes in floral buds of two sand pear (Pyrus pyrifolia Nakai) cultivarsrequiring different chilling hours for bud break

Hussain¹,

Liu²,

Liu³

et al. 2015

Turk J Agric For

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Seasonal expression pattern of antioxidative genes (dehydrins), activities of antioxidant enzymes and H 2 O 2 contents, and their relations to dormancy phases in floral buds of sand pear (Pyrus pyrifolia Nakai 'Cuiguan' and 'Wonhwang') were documented in the present study. The results showed that the expression patterns of PpDHN1, PpDHN2, and PpDHN3 in the two cultivars were similar, but the expression peak time and quantity were different. In the floral buds of Cuiguan, expression of all three dehydrin genes (PpDHN1, PpDHN2, and PpDHN3) was detected during endodormancy, reached the highest levels in ecodormancy, and then declined during the bud break stage. In the floral buds of Wonhwang, the expression of all the dehydrin genes (PpDHN1, PpDHN2, and PpDHN3) were at their highest in endodormancy and declined in ecodormancy. High activities of superoxide dismutase (SOD) were detected in endodormancy and decreased during ecodormancy, then increased again during bud break stage. Peroxidase (POD) quantities were different between the two cultivars, but followed similar activity patterns: POD activities were low during endodormancy, reached their lowest point during ecodormancy, and then increased again at the bud break stage. Catalase (CAT) activities were increased during endodormancy and reached their peak level in ecodormancy before decreasing in the bud break stage in both cultivars on different sampling dates. Ascorbate peroxidase (APX) activities were decreased in endodormancy, increased in ecodormancy, and at their peak in the bud break stage, with different amounts of ascorbate in both cultivars. The highest level of H 2 O 2 content was detected during endodormancy release in floral buds of Cuiguan, while it was decreased during endodormancy in Wonhwang; their content decreased in bud break stage. During dormancy, the activities of SOD, POD, and APX decreased while CAT activity increased with the expression of dehydrin genes and H 2 O 2 content. Therefore, the changes in gene expression, enzyme activities, and H 2 O 2 content may be involved in the antioxidant defense mechanisms in floral buds of pear cultivars during dormancy.

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Section: Discussionmentioning

confidence: 99%

Study on the expression of dehydrin genes and activities of antioxidativeenzymes in floral buds of two sand pear (Pyrus pyrifolia Nakai) cultivarsrequiring different chilling hours for bud break

Hussain¹,

Liu²,

Liu³

et al. 2015

Turk J Agric For

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“…Plants also weave antioxidant enzymes to detoxify metal-stress induced damage (Sun & Lin 2010). Through our studies we uncovered a phenomenon in which different rice cultivars adopt different biochemical strategies against Cd stress, some of which being really important for the adaptation of rice plants to metal stress.…”

Section: Introductionmentioning

confidence: 95%

Comparative study of four rice cultivars with different levels of cadmium tolerance

Xiao

Zhang

et al. 2012

Biologia

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Cadmium (Cd) has been identified as a significant pollutant due to its high solubility in water and soil and high toxicity to plants and animals. Rice, as one of the most important food crops, is grown in soils with variable levels of Cd and therefore, is important to discriminate the Cd tolerance of different rice cultivars to determine their suitability for cultivation in Cd-contaminated soils. This study investigates the primary mechanisms employed by four rice cultivars in attaining Cd tolerance. HA63 cultivar reduces Cd uptake by increasing Fe absorption through activation of phytosiderophores. T3028 cultivar accumulates the highest level of Cd in leaves while also activating its reactive oxygen species (ROS) scavenging system, including antioxidant enzymes and phytochelatins. In some rice cultivars (such as HA63), a cyanide-resistant respiration mechanism, important in Cd detoxification, was also promoted under the Cd stress. In conclusion, different rice cultivars may adopt different biochemical strategies and respond with different efficiency to Cd stress.

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“…In addition, the S-fragment of several DHNs contains a phosphorylation site; for example, a differential phosphorylation pattern was observed in DHN-5 during wheat response to drought and salt stress (Brini et al, 2007b). Improved responses to abiotic stress and resulting plant adaptation are therefore largely the result of DHNs, which help protect cells from dehydration, stabilize the cell membrane, eliminate free radicals, bind metal ions, and act as a molecular chaperone (Sun and Lin, 2010; Graether and Boddington, 2014). …”

Section: Introductionmentioning

confidence: 99%

Effect of HbDHN1 and HbDHN2 Genes on Abiotic Stress Responses in Arabidopsis

et al. 2017

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Dehydrin is a type of late embryogenesis abundant (LEA) protein. The dehydrin genes, HbDHN1 and HbDHN2, in Hevea brasiliensis were previously found to be induced at the wounding site of epicormic shoots, with local tissue dehydration identified as the key signal for laticifer differentiation. However, the exact role of the HbDHNs remains unknown. In this study, HbDHN1 and HbDHN2 expression was examined under multiple abiotic stresses; namely, cold, salt, drought, wounding, abscisic acid (ABA), ethylene (ET), and jasmonic acid (JA) treatment. Although, both HbDHNs were defined as SK2-type dehydrin, they showed different cellular localizations. Overexpression of the HbDHNs in Arabidopsis thaliana further revealed a significant increase in tolerance to salt, drought and osmotic stresses. Increased accumulation of proline and a reduction in electrolyte leakage were also observed under salt and drought stress, and a higher water content was indicated under osmotic stress. The transgenic plants also showed higher activity levels of ascorbate peroxidase (APX), superoxide dismutase (SOD) and catalase, and accumulated less hydrogen peroxide (H2O2) and superoxide (O2−). Given that reactive oxygen species (ROS) are thought to be a key signal for laticifer differentiation, these findings suggest that HbDHNs act as ROS scavengers, directly or indirectly affecting laticifer differentiation. Both HbDHNs therefore influence physiological processes, improving plant tolerance to multiple abiotic stresses.

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Role of plant dehydrins in antioxidation mechanisms

Cited by 36 publications

References 39 publications

Study on the expression of dehydrin genes and activities of antioxidativeenzymes in floral buds of two sand pear (Pyrus pyrifolia Nakai) cultivarsrequiring different chilling hours for bud break

Study on the expression of dehydrin genes and activities of antioxidativeenzymes in floral buds of two sand pear (Pyrus pyrifolia Nakai) cultivarsrequiring different chilling hours for bud break

Comparative study of four rice cultivars with different levels of cadmium tolerance

Effect of HbDHN1 and HbDHN2 Genes on Abiotic Stress Responses in Arabidopsis

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