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Genotypic Variation for High Temperature Tolerance in Relation to Carbon Partitioning and Grain Sink Activity in Wheat

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American Journal of Plant Sciences 2012年第3期3卷 381-390页

作者： Bavita Asthir puneet kaur rai Navtej S. Bains Virinder S. Sohu Department of Biochemistry Punjab Agricultural University Ludhiana India Department of Plant Breeding and Genetics Punjab Agricultural University Ludhiana India

Effect of high temperature tolerance in relation to carbon partitioning and grain sink activity was studied in ten genotypes of wheat (viz C 306, PBW 343, PBW 502, PBW 509, PBW 521, PBW 522, PBW 550, Inqalab, WL 711 and Sonalika) under normal (November, 25.6°C during grain filling) and late planting conditions (December, 29.4°C). Contents of reducing sugars first increased till actively metabolizing stage i.e. 14 days after anthesis (DAA) in parallel with the activity of acid invertase and thereafter declined. Significant reduction in total free sugars and sucrose content was observed during grain development. Acid invertase activity got induced especially in PBW 343 and C 306 under late sown conditions, whereas sucrose synthase, total amylase activities got repressed. Sucrose synthase was significantly high at all stages and it predominated over invertases. Neutral invertase and total amylase showed peak activity of one week earlier in the late sown crop as compared to normal sown crop. A premature cessation of starch deposition occurred in cvs PBW 521, PBW 522 under late sown conditions due to shortening of grain filling period. Our results suggest that decline in sugar content in spite of high sucrolytic enzymes may be correlated to more utilization of assimilates over production/translocation for grain sink activity under high temperature influences. Knowledge of the mechanisms that underlie carbohydrate partitioning in diverse genotypes could be exploited for generating germplasm that can tolerate high temperature.

关键词： Carbohydrate Metabolism Genotypes Grains Heat Stress Sucrose Starch Triticum aestivum L.

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Buspirone along with melatonin attenuates oxidative damage and anxiety-like behavior in a mouse model of immobilization stress

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Chinese Journal of Natural Medicines 2014年第8期12卷 582-589页

作者： Anil Kumar Gurleen kaur puneet Rinwa Pharmacology Division University Institute of Pharmaceutical Sciences UGC Centre of Advanced Study Panjab University

AIM: Stress is recognized to precipitate anxiety and related psychological problems characterized by a wide range of biochemical and behavioral changes. The present study was carried out to investigate the protective effects of melatonin and buspirone, and their combination, against six hours immobilization stress-induced, anxiety-like behavioral and oxidative damage in mice. METHOD: Male Laca mice were pre-treated with melatonin(2.5, 5 mg·kg–1), buspirone(5, 10 mg·kg–1), and their combination for consecutive five days. On the 6th day, animals were immobilized for six hours, and thereafter various behavioral tests were performed followed by biochemical tests. RESULTS: Immobilization stress significantly impaired body weight, locomotor activity, and caused anxiety-like behavior, along with increased oxidative damage. Pretreatment with melatonin and buspirone significantly improved the loss in body weight and locomotor activity, attenuated anxiety-like behavior(in both the mirror chamber and plus maze performance tasks), further restored the levels of brain total proteins, and caused antioxidant-like effects, as evidenced by reduced lipid peroxidation, nitrite concentration, and restoration of reduced glutathione and catalase activity, as compared to control animals. In addition, combination of melatonin(2.5, 5 mg·kg–1) with buspirone(5 mg·kg–1) significantly potentiated their protective effects, as compared to their effects individually. CONCLUSION: The present study suggests that melatonin potentiates the beneficial effect of buspirone against immobilization stress-induced, anxiety-like behavioral and oxidative damage in mice possibly by involving a serotonergic mechanism.

关键词： Buspirone Melatonin Immobilization Anxiety Oxidative stress

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