Seasonal Patterns of Glutathione and Ascorbate Metabolism in Field-Grown Cotton under Water Stress

Mahan, J. R.; Wanjura, D. F.

doi:10.2135/cropsci2005.0193

Cited by 17 publications

(14 citation statements)

References 36 publications

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“…Cellular damage, membrane damage, enhanced levels of reactive oxygen and nitrogen species, and reduced stomatal conductance were key features of that stress, and rewatering resulted in partial or complete alleviation of the stress-induced damage [203]. H 2 O 2 was also found to increase in Prunus hybrids (70 days of water stress in 1-year-old plants) [206], P. przewalskii (water stress at 2 months aged plants) [207], Oryza sativa (3 weeks of water stress in 2.5 months aged seedling) [208], Poa pratensis (water stress for 5 days) [209], T. durum (35 days of water stress on 30-day-old seedlings) [210], and T. aestivum (197 days of water stress in 3-month-old plants) the decrease of H 2 O 2 and increase of lipid peroxidation [211] with increasing water stress. Uzilday et al [103] compared the effects of drought among two C 3 and C 4 plants.…”

Section: Drought and Oxidative Stressmentioning

confidence: 95%

Drought Stress Responses in Plants, Oxidative Stress, and Antioxidant Defense

Hasanuzzaman

Nahar

Gill

et al. 2013

Climate Change and Plant Abiotic Stress Tolerance

128

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Global climate change is currently viewed as the most devastating threat to the environment, and is now gaining considerable attention from farmers, researchers, and policy makers because of its major influence on agriculture. The situation is becoming more serious due to gradual increases in the complex nature of the environment, and due to the unpredictability of environmental conditions and global climate change. One of the most acute environmental stresses presently affecting agriculture is drought, which has pronounced adverse effects on the growth and development of crop plants. The effects of drought stress are expected to increase further with increases in climate change and a growing water crisis. Drought stress usually leads to reductions in crop yield, which can result from many drought-induced morphological, physiological, and metabolic changes that occur in plants. A key sign of drought stress at the molecular level is the accelerated production of reactive oxygen species (ROS) such as singlet oxygen ( 1 O 2 ), superoxide (O 2 À ), hydrogen peroxide (H 2 O 2 ), and hydroxyl radicals (OH ). The excess production of ROS is common in many abiotic stresses, including drought stress, and results from impaired electron transport processes in the chloroplasts and mitochondria. One of the major causes of ROS production under drought stress is photorespiration, which accounts for more than 70% of the total H 2 O 2 produced. Plants have endogenous mechanisms for adapting to ROS production and are thought to respond to drought stress by strengthening these defense mechanisms. Therefore, enhancement of the functions of the naturally occurring antioxidant components (enzymatic and non-enzymatic) may be one strategy for reducing or preventing oxidative damage and improving the drought resistance of plants. In this chapter, we review the most recent reports on drought-induced responses in plants, focusing on the role of oxidative stress as well as on other possible mechanisms and examining how different components of the antioxidant defense system may confer tolerance to drought-induced oxidative stress.

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Section: Drought and Oxidative Stressmentioning

confidence: 95%

Drought Stress Responses in Plants, Oxidative Stress, and Antioxidant Defense

Hasanuzzaman

Nahar

Gill

et al. 2013

Climate Change and Plant Abiotic Stress Tolerance

128

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“…To identify the changes in antioxidant system Mahan and Wanjura (2005) conducted experiments on field grown cotton under season long drought stress and observed slight change in glutathione metabolism in response to water deficit conditions and no major change in the levels of malondialdehyde (MDA). While activity of ascorbate peroxidase was less in control treatments as compared to drought affected plants.…”

Section: Anti Oxidant Defense Systemmentioning

confidence: 99%

Understanding and Mitigating the Impacts of Drought Stress in Cotton- A Review

Saleem¹,

Aown²,

Raza³

et al. 2016

PAKJAS

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Water scarcity is the most serious abiotic stress restricting plant productivity throughout the world. Losses in crop yield due to drought exceed from losses caused by other environmental factors. In this review article different morphological, physiological and yield attributes of cotton under drought stress, mechanism of drought induced losses and various management strategies to mitigate drought stress have been discussed. Drought stress reduces growth of leaf, stem and root, interferes with leaf water relations, photosynthesis, respiration, reduces water-use efficiency and ultimately yield of cotton. Under water deficit conditions cotton shows various responses to cope with drought stress. The major mechanisms include accumulation of osmoregulators, plant growth regulators and production of heat shock proteins. Different management strategies to alleviate water deficit stress like foliar application of osmolytes, potassium and growth regulators (hormones), various drought responsive genes, proteins at molecular level, screening and breeding programs against drought tolerance and mulching are also discussed in this paper.

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“…Mahan and Wanjura (2005) performed field studies to identify changes in antioxidant metabolism in cotton subjected to season‐long water deficits in the field. The results of that study indicated that glutathione metabolism changed significantly over the growing season but not in response to water deficits.…”

mentioning

confidence: 99%

Antioxidant Metabolism in Cotton Seedlings Exposed to Temperature Stress in the Field

Mahan¹,

Mauget²

2005

Crop Science

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malondialdehyde (MDA), a compound correlated with oxidative damage in plants, did not increase in response Early season temperature stress adversely affects the growth and to water deficits and it was proposed that oxidative development of cotton (Gossypium hirsutum L.) seedlings. Oxidative damage was substantially mitigated in the plants under damage resulting from temperature extremes is thought to be a cause of diminished seedling performance. Cotton (cv Fibermax 958) was water stress without large changes in antioxidant metabplanted at Lubbock, TX, in 2003 and 2004 to investigate the effect of olism. The absence of a water deficit response was attriblow and high temperatures on oxidative stress and antioxidant metabouted to the sufficiency of antioxidant protection in cotlism in seedlings exposed to normal thermal variation. Early and late ton under water stress in the field, particularly in light plantings in 2003 provided seedlings of different ages for comparisons. of the gradual nature of the development and alleviation Malondialdehyde was slightly increased in response to low temperaof water deficits under field conditions. Simply stated, tures indicating some oxidative damage in the seedlings. The activities the plant had adequate time and resources to respond of ascorbate peroxidase and glutathione reductase were not altered in to changing water deficits. response to low or high temperatures. The glutathione pool was pre-Unlike water deficits, temperature stresses in the field dominately reduced in all plantings in both years indicating sufficient can develop and be alleviated within hours, providing reduced glutathione. It is concluded that the indicators of antioxidant the plant less time to respond adaptively. Perhaps this metabolism varied in the seedlings but not in response to temperature variation. It is proposed that antioxidant metabolism in the seedlings Plant Materials (jmahan@lbk.ars.usda.gov).Cotton (G. hirsutum cv. Fibermax 958) was planted on

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Seasonal Patterns of Glutathione and Ascorbate Metabolism in Field-Grown Cotton under Water Stress

Cited by 17 publications

References 36 publications

Drought Stress Responses in Plants, Oxidative Stress, and Antioxidant Defense

Drought Stress Responses in Plants, Oxidative Stress, and Antioxidant Defense

Understanding and Mitigating the Impacts of Drought Stress in Cotton- A Review

Antioxidant Metabolism in Cotton Seedlings Exposed to Temperature Stress in the Field

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