Selenium as stressor and antioxidant affects pollen performance in Olea europaea

Tedeschini, Emma; Proietti, Primo; Timorato, Veronica; D’Amato, Roberto; Nasini, Luigi; Buono, Daniele Dei; Businelli, Daniela; Frenguelli, Giuseppe

doi:10.1016/j.flora.2015.05.009

Cited by 34 publications

(22 citation statements)

References 49 publications

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“…In another study with wheat under drought stress, foliar application of Se significantly lowered osmotic potential resulting in increased turgor, enhanced transpiration rate, improved accumulation of total soluble sugars and free amino acids, and increased antioxidant activity which increased the grain yield by 24% [169]. Selenium also induced pollen germination in olive trees under drought stress [170].…”

Section: Reducing Adverse Effects Of Environmental Stressesmentioning

confidence: 95%

Selenium in the Soil-Plant Environment: A Review

Saha¹

2017

IJAAS

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Selenium (Se) exhibits a "double-edged" behavior in animal and human nutrition. It is a micronutrient required in low concentrations by animals and humans, but toxic at high concentrations. Selenium deficiency has been associated with cancer and other health problems. Selenium requirements are commonly met through soils and plants such as wheat, rice, vegetables and maize in many countries. Selenium concentration in the soil generally ranges from 0.01-2.0 mg kg-1 but seleniferous soils usually contain more than 5 mg kg-1. Seleniferous soils have been reported in Ireland, China, India and USA. Weathering of parent rocks and atmospheric deposition of volcanic plumes are natural processes increasing Se levels in the environment. Anthropogenic sources of Se include irrigation, fertilizer use, sewage sludge and farmyard manure applications, coal combustion and crude oil processing, mining, smelting and waste incineration. Mobility of Se in the soil-plant system largely depends on its speciation and bioavailability in soil which is controlled by pH and redox potential. Plant uptake of Se varies with plant species and Se bioavailability in the soil. The uptake, translocation, transformation, metabolism, and functions of Se within the plant are further discussed in the paper. The release of Se in soils and subsequent uptake by plants has implications for meeting Se requirements in animals and humans.

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Section: Reducing Adverse Effects Of Environmental Stressesmentioning

confidence: 95%

Selenium in the Soil-Plant Environment: A Review

Saha¹

2017

IJAAS

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“…All trees reached the first stage of flowering between June 4 and 6, 2018. The phenology assessment of olive initial flowering was established when the pollen was freely released by shaking the anthers of different branches, located at different heights on the tree and with different exposures (see Tedeschini et al, 2015).…”

Section: Plant Material Growing Conditions and Pollen Collectionmentioning

confidence: 99%

“…However, as a food additive, it is used with caution because of its high toxicity. Although so far, it has not been confirmed as an essential micronutrient for trees, there is increasing evidence that it plays a role in abiotic stress, causing an overproduction of reactive oxygen species (ROS) (Lyons et al, 2009;Prins et al, 2011;Proietti et al, 2013;Tedeschini et al, 2015;D'Amato et al, 2017). Although ROS are normally produced by cells at low concentrations and participate in membrane signals and cell events, such as sexual plant reproduction (recognition between pollen and stigma), their accumulation leads to oxidative stress due to the loss of cell scavenging capacity (Hancock et al, 2001;Laloi et al, 2004;Kwak et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Selenium-Enriched Pollen Grains of Olea europaea L.: Ca2+ Signaling and Germination Under Oxidative Stress

et al. 2019

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Selenium (Se) shows antioxidant properties that can be exploited in plants to combat abiotic stresses caused by reactive oxygen species produced in excess (ROS). Here, we show that the Se-fertilization of olive trees with sodium selenate effectively protects the pollen from oxidative stress. Pollen isolated from plants treated with Se or from untreated controls was incubated in vitro with H 2 O 2 to produce an oxidative challenge. Given the impact of ROS on Ca 2+ homeostasis and Ca 2+-dependent signaling, cytosolic Ca 2+ was measured to monitor cellular perturbations. We found that H 2 O 2 interrupted Ca 2+ homeostasis only in untreated pollen, while in samples treated in vitro with sodium selenate or selenium methionine, Ca 2+ homeostasis was preserved. Furthermore, germination rates were considerably better maintained in Se-fertilized pollen compared to non-fertilized pollen (30% vs. 15%, respectively) after exposure to 1 mM H 2 O 2. The same was observed with pollen treated in vitro with Se-methionine, which is the organic form of Se, in which part of the fertigated sodium selenate is converted in the plant. Combined, our results show a close correlation between ROS, Ca 2+ homeostasis, and pollen fertility and provide clear evidence that Se-fertilization is a potential approach to preserve or improve agricultural productivity.

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“…A major biochemical alteration, also induced by other types of stress, is the production of reactive oxygen species (ROS) (Gill and Tuteja, 2010; Boguszewska and Zagdańska, 2012; Ozgur et al, 2013; Bose et al, 2014). An excess of ROS leads to lipid peroxidation, inhibition of enzymes, and modifications of nucleic acids (Proietti et al, 2013; Bose et al, 2014; Tedeschini et al, 2015). Under stress conditions, plants can nonetheless develop tolerance, that is, the ability to adequately survive, and often prosper, under an unfavorable environment, following a robust production of antioxidant enzymes (Ben Ahmed et al, 2009; Bhaduri and Fulekar, 2012; Keunen et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Behavior of Four Olive Cultivars During Salt Stress

et al. 2019

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Olive is considered as a moderately salt tolerant plant, however, tolerance to salt appears to be cultivar-dependent and genotypic responses have not been extensively investigated. In this work, saline stress was induced in four olive cultivars: Arbequina, Koroneiki, Royal de Cazorla and Fadak 86. The plants were grown in 2.5 l pots containing 60% peat and 40% of pumice mixture for 240 days and were irrigated three times a week with half-strength Hoagland solution containing 0, 100 and 200 mM NaCl. The effects of salt stress on growth, physiological and biochemical parameters were determined after 180, 210, and 240 days of treatment. Saline stress response was evaluated in leaves by measuring the activity of GSH and CAT enzymatic activity, as well as proline levels, gas exchanges, leaves relative water content and chlorophyll content, and proline content. All the studied cultivars showed a decrease in Net Photosynthesis, leaves chlorophyll content and plant growth (mainly leaves dry weight) and an increase in the activity of GSH and CAT. In addition, the reduction of proline content in leaf tissues, induced an alteration of osmotic regulation. Among the studied cultivars Royal and Koroneiki better counteracting the effects of saline stress thanks to a higher activity of two antioxidant enzymes.

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Selenium as stressor and antioxidant affects pollen performance in Olea europaea

Cited by 34 publications

References 49 publications

Selenium in the Soil-Plant Environment: A Review

Selenium in the Soil-Plant Environment: A Review

Selenium-Enriched Pollen Grains of Olea europaea L.: Ca2+ Signaling and Germination Under Oxidative Stress

Behavior of Four Olive Cultivars During Salt Stress

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