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Root Antioxidant Mechanisms in Relation to Root Thermotolerance in Perennial Grass Species Contrasting in Heat Tolerance


, : Root Antioxidant Mechanisms in Relation to Root Thermotolerance in Perennial Grass Species Contrasting in Heat Tolerance. Plos One 10(9): E0138268-E0138268

Mechanisms of plant root tolerance to high temperatures through antioxidant defense are not well understood. The objective of this study was to investigate whether superior root thermotolerance of heat-tolerant Agrostis scabra relative to its congeneric heat-sensitive Agrostis stolonifera was associated with differential accumulation of reactive oxygen species and antioxidant scavenging systems. A. scabra 'NTAS' and A. stolonifera 'Penncross' plants were exposed to heat stress (35/30°C, day/night) in growth chambers for 24 d. Superoxide (O2(-)) content increased in both A. stolonifera and A. scabra roots under heat stress but to a far lesser extent in A. scabra than in A. stolonifera. Hydrogen peroxide (H2O2) content increased significantly in A. stolonifera roots but not in A. scabra roots responding to heat stress. The content of antioxidant compounds (ascorbate and glutathione) did not differ between A. stolonifera and A. scabra under heat stress. Enzymatic activity of superoxide dismutase was less suppressed in A. scabra than that in A. stolonifera under heat stress, while peroxidase and catalase were more induced in A. scabra than in A. stolonifera. Similarly, their encoded transcript levels were either less suppressed, or more induced in A. scabra roots than those in A. stolonifera during heat stress. Roots of A. scabra exhibited greater alternative respiration rate and lower cytochrome respiration rate under heat stress, which was associated with suppression of O2(-) and H2O2 production as shown by respiration inhibitors. Superior root thermotolerance of A. scabra was related to decreases in H2O2 and O2(-) accumulation facilitated by active enzymatic antioxidant defense systems and the maintenance of alternative respiration, alleviating cellular damages by heat-induced oxidative stress.

US$19.90

PMID: 26382960

DOI: 10.1371/journal.pone.0138268


Other references

Habal, P.; Omran, N.; Chek, J.; Krejsek, J.; Mandak, J., 2015: New biomarkers in the selection of patients for talcage of pleural cavity in the palliative therapy of malign pleural exudate. Chemical pleurodesis using videothoracoscopically applied powdered talc under general anaesthesia and selective pulmonary ventilation is the most effective method of palliative therapy for malign pleural exudate. Talc produces an intense systemic...

Lin, V.; Golub, J.S.; Nguyen, T.Bui.; Hume, C.R.; Oesterle, E.C.; Stone, J.S., 2011: Inhibition of Notch activity promotes nonmitotic regeneration of hair cells in the adult mouse utricles. The capacity of adult mammals to regenerate sensory hair cells is not well defined. To explore early steps in this process, we examined reactivation of a transiently expressed developmental gene, Atoh1, in adult mouse utricles after neomycin-induc...

Cressie N.A.C.; Whitford H.J., 1986: How to use the two sample t test. This work discusses how two sample t-tests behave when applied to data that may violate the classical statistical assumptions of independence, heteroscedasticity and Gaussianity. The usual two sample t-statistic based on a pooled variance estimate...

Mueske, N.M.; Ryan, D.D.; Van Speybroeck, A.L.; Chan, L.S.; Wren, T.A.L., 2015: Fat distribution in children and adolescents with myelomeningocele. To evaluate fat distribution in children and adolescents with myelomeningocele using dual-energy X-ray absorptiometry (DXA). Cross-sectional DXA measurements of the percentage of fat in the trunk, arms, legs, and whole body were compared between 8...

Hukuhara, T.; Neya, T.; Tsuchiya, K., 1969: The effect of the intrinsic mucosal reflex upon the propagation of intestinal contractions. Japanese Journal of Physiology 19(6): 824-833

Kanda K.; Homma S.; Watanabe S., 1973: Vibration reflex in spastic patients. Desmedt, John E (Ed ) New Developments in Electromyography And Clinical Neurophysiology, Vol 3 Human Reflexes, Pathophysiology Of Motor Systems And Methodology Of Human Reflexes Viii+870p Illus S Karger: Basel, Switzerland; New York, N Y , U S A 469-474

Morillo-Garcia, M., 1975: The olive grove. Explotacion agraria: 11 8-9

de Laever, E., 1985: Etude des Caradrina Ochsenheimer. Un Paradrina nouveau: Paradrina douzina. Un nouveau genre, voisin des Eremodrina Boursin: Douzdrina et une espece nouvelle: Douzdrina protector (lepidopteres, Noctuidae Amphipyrinae). Nota Lepidopterologica, 82: 145-151

Feng, W.; Li, L.; Du, X.; Welle, A.; Levkin, P.A., 2016: Single-Step Fabrication of High-Density Microdroplet Arrays of Low-Surface-Tension Liquids. A facile approach for surface patterning that enables single-step fabrication of high-density arrays of low-surface-tension organic-liquid microdroplets is described. This approach enables miniaturized and parallel high-throughput screenings in or...

Wojtal, P.; Sedlackova, L.; Wilczynski, J., 2005: Human activities on the faunal material. Unknown