The system modulating ROS content in germinating seeds of two Brazilian savanna tree species exposed to As and Zn

Gomes, Marcelo Pedrosa; Carneiro, Marília Mércia Lima Carvalho; Nogueira, C. O. G.; Soares, Ângela Maria; Garcia, Queila Souza

doi:10.1007/s11738-012-1140-6

Cited by 33 publications

(28 citation statements)

References 44 publications

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“…The importance of the coupled activities of SOD and CAT in maintaining the oxidative status of seeds during germination was suggested by Pergo & Ishii-Iwamoto (2011). We recently confirmed the central role of APX in assuring seed germination when exposed to toxic levels of arsenic (As) and zinc (Zn) (Gomes et al 2012).…”

Section: Ros the Environment And Seed Germinationmentioning

confidence: 65%

Reactive oxygen species and seed germination

2013

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Reactive oxygen species (ROS) are continuously produced by the metabolically active cells of seeds, and apparently play important roles in biological processes such as germination and dormancy. Germination and ROS accumulation appear to be linked, and seed germination success may be closely associated with internal ROS contents and the activities of ROS-scavenging systems. Although ROS were long considered hazardous molecules, their functions as cell signaling compounds are now well established and widely studied in plants. In seeds, ROS have important roles in endosperm weakening, the mobilization of seed reserves, protection against pathogens, and programmed cell death. ROS may also function as messengers or transmitters of environmental cues during seed germination. Little is currently known, however, about ROS biochemistry or their functions or the signaling pathways during these processes, which are to be considered in the present review.

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Section: Ros the Environment And Seed Germinationmentioning

confidence: 65%

Reactive oxygen species and seed germination

2013

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“…Often, the exposition to high trace element amounts or to nonessential trace elements such as arsenic (As), cadmium (Cd), lead (Pb) and mercury (Hg) leads to plant intoxication and then death. However, some plants are able to cope with trace element phytotoxicity and their natural occurrence in contaminated areas has been verified (Gomes et al, 2013a(Gomes et al, , 2013b. This is a strong indicator that some plants show tolerance mechanisms which allow them to survive under the trace element stress.…”

Section: Trace Elements and Plantsmentioning

confidence: 99%

“…Some studies have also shown the stimulator effects of trace elements in seed germination (Li et al, 2007;Kranner and Colville, 2011;Duarte et al, 2012;Gomes et al, 2013a). This could be attributed to an overproduction of ROS and reactive nitrogen species (RNS) such as nitric oxide (NO) in plants challenged by trace elements, resulting in a slightly enhanced level of oxidative stress that stimulates germination À the oxidative window (Bailly et al, 2008;Lefèvre et al, 2009).…”

Section: Trace Elements and Seed Germinationmentioning

confidence: 99%

“…This could be attributed to an overproduction of ROS and reactive nitrogen species (RNS) such as nitric oxide (NO) in plants challenged by trace elements, resulting in a slightly enhanced level of oxidative stress that stimulates germination À the oxidative window (Bailly et al, 2008;Lefèvre et al, 2009). In this context, a strictly regulated concentration of ROS is required for germination (Bailly et al, 2008) and so, the capacity of seeds to control ROS levels during germination could aid in neutralizing oxidative stress generated by the presence of trace elements (Gomes et al, 2013a).…”

Section: Trace Elements and Seed Germinationmentioning

confidence: 99%

“…Although high concentrations of ROS can lead to phytotoxicity, relatively low levels can function as signaling molecules under conditions of abiotic stress (Miller et al, 2008;Gill and Tuteja, 2010;Leymarie et al, 2012). In this context the activities of the systems modulating ROS content are quite important and have been intrinsically related to plant ability to cope with trace element toxicity (Gomes et al, 2013a(Gomes et al, , 2013b. As such, the present chapter evaluates the physiological responses of seeds and plants to trace elements in order to elucidate the underlying physiological mechanisms of their tolerance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Trace Elements Tolerance Modulated by Antioxidant System in Plants

Gomes¹,

Carneiro²,

Garcia³

2014

Oxidative Damage to Plants

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Integrative effects of zinc and temperature on germination in Dimorphandra wilsonii rizz.: Implications of climate changes

Bicalho

Gomes

Rodrigues-Junior

et al. 2017

Enviro Toxic and Chemistry

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The integrative effects of zinc (Zn; 0 mg L , 75 mg L , 150 mg L , and 200 mg L ) and temperature (25 °C, 30 °C, and 35 °C) on seed germination of the threatened Brazilian species Dimorphandra wilsonii were evaluated. Zinc effects on seed germination were only observed at 30 °C and 35 °C. By stimulating respiration rates, rising temperatures accentuate hydrogen peroxide (H O ) formation in germinating seeds in the presence of Zn. Seed Zn tolerance was related to the activation of enzymatic antioxidants, and ascorbate peroxidase (APX) activity had a central role in H O scavenging under the highest temperatures tested. Increased APX activity allowed successful germination, whereas decreasing APX activity was accompanied by decreasing germination rates in Zn-treated seeds at 35 °C. Within a scenario of future climate change, it will be extremely important to avoid increasing Zn concentrations in natural habitats that would threaten conservation efforts directed toward this endangered plant species. Environ Toxicol Chem 2017;36:2036-2042. © 2017 SETAC.

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The system modulating ROS content in germinating seeds of two Brazilian savanna tree species exposed to As and Zn

Cited by 33 publications

References 44 publications

Reactive oxygen species and seed germination

Reactive oxygen species and seed germination

Trace Elements Tolerance Modulated by Antioxidant System in Plants

Integrative effects of zinc and temperature on germination in Dimorphandra wilsonii rizz.: Implications of climate changes

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