Antioxidant responses of rice seedlings to salinity stress

Dionisio-Sese, Maribel L.; Tobita, Satoshi

doi:10.1016/s0168-9452(98)00025-9

Cited by 1,594 publications

(601 citation statements)

References 28 publications

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“…A coloração de segmentos radiculares com reagente de Shiff confi rmou este resultado, já que este reagente evidencia aldeídos, os quais são subprodutos da peroxidação de lipídios (Yamamoto et al 2001). Considerando que a concentração de TBARS tem sido usada como indicador de danos oxidativos (Dionisio-Sese & Tobita 1998;Sairam & Srivastava 2002;Bandeoglu et al 2004), é possível que a salinidade não tenha acarretado o estresse oxidativo secun-dário em raízes de feijão caupi. Assim sendo, esta espécie deve apresentar mecanismos efi cientes para a renovação dos lipídios de membrana afetados e/ou para a remoção das EROs produzidas.…”

Section: Discussionunclassified

Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

et al. 2012

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ABSTRACT(Activities of antioxidant enzymes and root growth inhibition in cowpea seedlings exposed to diff erent salt levels). Phenol peroxidase (POX) is a dual enzyme that is involved with hydrogen peroxide scavenging and lignin biosynthesis, contributing to growth inhibition by secondary wall thickening. In order to relate growth inhibition to salt-induced oxidative modulation, the activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and POX were evaluated in cowpea roots under salinity. Four-day-old seedlings of the Pitiúba and Pérola cultivars were exposed to 0, 25, 50, 75 and 100 mM NaCl in germination paper under controlled conditions. Aft er two days of treatment, root length was reduced under 100 mM NaCl by 56 and 26% in Pitiúba and Pérola, respectively, which was associated with enhanced electrolyte leakage and cell death in the root apex. NaCl salinity did not trigger lipid peroxidation, indicating that cell death was probably due to membrane damage instead of oxidative stress. Salt stress reduced the activity of SOD, CAT and APX and increased the POX activity, demonstrating that this enzyme plays a role in oxidative protection in cowpea roots exposed to NaCl salinity. In conclusion, salt-induced growth inhibition in cowpea roots could be attributed, at least in part, to a coordinate action involving an increase in POX activity and a drop in CAT and APX activities. Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

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Section: Discussionunclassified

Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

et al. 2012

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“…Consequently, a degree of cellular oxidative damage in plants resulting from abiotic stress is mediated . It has been reported that salinity tolerance is closely related to antioxidant capacity in many plant species (Gossett et al 1994;Hernandez et al 1995;GuetaDahan et al 1997;Dionisio-Sese and Tobita 1998;Meneguzzo et al 1999;Hernandez et al 2000;Sreenivasulu et al 2000;Shalata et al 2001;Bor et al 2003;Mittova et al 2003;Turkan 2004, 2005;Koca et al 2006Koca et al , 2007Sekmen et al 2007;Yazici et al 2007;). In addition, transgenic plants overexpressing ROS-scavenging enzymes such as SOD (Badawi et al 2004;Tseng et al 2007), CAT (Tseng et al 2007), APX (Wang et al 1999) and GR (Foyer et al 1995) showed enhanced tolerance to the oxidative stresses in plants under adverse conditions.…”

Section: Oxidative Stress Induced By Salt Stressmentioning

confidence: 99%

Physiological adaptive mechanisms of plants grown in saline soil and implications for sustainable saline agriculture in coastal zone

et al. 2013

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There is large area of saline abandoned and lowyielding land distributed in coastal zone in the world. Soil salinity which inhibits plant growth and decreases crop yield is a serious and chronic problem for agricultural production. Improving plant salt tolerance is a feasible way to solve this problem. Plant physiological and biochemical responses under salinity stress become a hot issue at present, because it can provide insights into how plants may be modified to become more tolerant. It is generally known that the negative effects of soil salinity on plants are ascribed to ion toxicity, oxidative stress and osmotic stress, and great progress has been made in the study on molecular and physiological mechanisms of plant salinity tolerance in recent years. However, the present knowledge is not easily applied in the agronomy research under field environment. In this review, we simplified the physiological adaptive mechanisms in plants grown in saline soil and put forward a practical procedure for discerning physiological status and responses. In our opinion, this procedure consists of two steps. First, negative effects of salt stress are evaluated by the changes in biomass, crop yield and photosynthesis. Second, the underlying reasons are analyzed from osmotic regulation, antioxidant response and ion homeostasis. Photosynthesis is a good indicator of the harmful effects of saline soil on plants because of its close relation with crop yield and high sensitivity to environmental stress. Particularly, chlorophyll a fluorescence transient has been accepted as a reliable, sensitive and convenient tool in photosynthesis research in recent years, and it can facilitate and enrich photosynthetic research under field environment.

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“…Electrolyte leakage (EL) was estimated according to the method of Dionisio-Sese and Tobita (1998). Fresh leaf samples (1 g) were washed with triple distilled water, and cut into small pieces (1 cm 2 segments) and suspended in test tubes containing 15 ml of deionized water.…”

Section: Electrolyte Leakagementioning

confidence: 99%

Oxidative stress induced expression of monodehydroascorbate reductase gene in Eleusine coracana

Sudan

Negi

Arora

2015

Physiol Mol Biol Plants

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Abiotic stresses constitute a serious threats to the world food security as they cause significant economic losses in terms of reduction in crop productivity and also greatly limit the geographical locations where crops can be grown. Exposure to abiotic stress causes over-production of reactive oxygen species, leading to oxidative stress in plants. Induction of oxidative stress is primarily responsible for a variety of detrimental changes in the cellular physiology. However, plants have evolved intricate anti-oxidative defence machinery, for their survival under stress. Plant defence strategies for stress tolerance rely on the expression of anti-oxidative genes required for scavenging the toxic reactive oxygen species. Monodehydroascorbate reductase is one of the key anti-oxidant enzyme responsible for scavenging reactive oxygen species. In the present study, efforts have been made to understand the role of monodehydroascorbate reductase in finger millet under different abiotic stresses (drought, salt and UV radiation). The study establishes a differential link between mdar gene expression and enzyme activity under oxidative stress that is validated under different types of imposed stresses. Alteration in correlation between gene expression and enzyme activities under varying magnitude of oxidative stress is elucidated.

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Antioxidant responses of rice seedlings to salinity stress

Cited by 1,594 publications

References 28 publications

Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

Atividade de enzimas antioxidantes e inibição do crescimento radicular de feijão caupi sob diferentes níveis de salinidade

Physiological adaptive mechanisms of plants grown in saline soil and implications for sustainable saline agriculture in coastal zone

Oxidative stress induced expression of monodehydroascorbate reductase gene in Eleusine coracana

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