Ecophysiological responses to excess iron in lowland and upland rice cultivars

Müller, Caroline; Silveira, Solange Ferreira da Silveira; Daloso, Danilo de Menezes; Mendes, Giselle Camargo; Merchant, Andrew; Kuki, Kacilda Naomi; Oliva, Marco Antônio; Loureiro, Marcelo Ehlers; Almeida, Aparecida Marques de

doi:10.1016/j.chemosphere.2017.09.033

Cited by 37 publications

(25 citation statements)

References 75 publications

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“…In major detail, alternation from anaerobic to aerobic soil conditions would determine: i) shifts of Cu 2+ , Ni 2+ , and Cd 2+ from their insoluble sulfide salts to the soluble sulfate ones [43][44][45]; ii) shifts of the As(III) water-soluble, mobile species to As(V), strongly adsorbed on soil (hydr)oxides and poorly mobile [46] and iii) changes in the balance between soluble Mn 2+ salts and insoluble Mn oxides [47]. The dynamics of Fe and Zn species as a function of the soil redox conditions and the interaction of these elements with the root system are quite complex and can alter their bioavailability [47,48], explaining the null or weak effect of the aerobic periods on their accumulation in the grain.…”

Section: Discussionmentioning

confidence: 99%

Continuous Flooding or Alternate Wetting and Drying Differently Affect the Accumulation of Health-Promoting Phytochemicals and Minerals in Rice Brown Grain

et al. 2019

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Climate changes impose adoption of water-saving techniques to improve the sustainability of irrigated rice systems. This study was aimed, by a two-years side-by-side comparison, at verifying the hypothesis whether “Alternate Wetting and Drying” (AWD) affects the concentrations of health-related compounds and minerals in brown grains of three japonica rice (Oryza sativa L.) cvs (‘Baldo’, ‘Gladio’, and ‘Loto’) usually grown in temperate areas in continuous flooding (CF). Due to the rotational turns in water distribution imposed by local authorities and to the weather behavior, different AWD timing and severity occurred in the two years of the study. AWD induced in both seasons yield losses in ‘Baldo’ and ‘Gladio’ but not in ‘Loto’. In the brown grains of ‘Loto’, AWD increased the concentrations of total tocols, γ-oryzanol, flavonoids, and the antioxidant activity. AWD affected the concentrations of minerals, particularly increasing copper, cadmium and nickel, and decreasing manganese, arsenic and zinc. In the sensitive cultivars, ‘Baldo’ and ‘Gladio’, AWD seems to affect plant yield, rather than for severity of the dry period, for prolonged absence of ponded water that exposes plants to cooler temperatures. The selection of suitable cultivars, like ‘Loto’, tolerant to AWD-related stresses, could combine environmental, yield-related, and nutritional benefits improving the product quality.

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Section: Discussionmentioning

confidence: 99%

Continuous Flooding or Alternate Wetting and Drying Differently Affect the Accumulation of Health-Promoting Phytochemicals and Minerals in Rice Brown Grain

et al. 2019

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“…Leaf tissues were then exposed to actinic light and a saturating pulse to obtain the steady-state fluorescence (F) and the maximum fluorescence in a lightadapted state (Fm′), respectively. This allowed determination the minimum fluorescence of the illuminated plant tissue (F0′), the coefficient photochemical quenching (qL), the effective quantum yield of photochemical energy conversion in PSII (YII), the quantum yield of non-regulated energy (YNPQ) and the apparent electron transport rate (ETR), as detailed by Müller et al (2017).…”

Section: Chlorophyll a Fluorescencementioning

confidence: 99%

A physiological approach for pre-selection of Eucalyptus clones resistant to drought

Müller¹,

Hodecker²,

Barros³

et al. 2020

iForest

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Biogeosciences and Forestry Biogeosciences and Forestry A physiological approach for pre-selection of Eucalyptus clones resistant to drought Caroline Müller (1-2) , Bárbara Elias Reis Hodecker (1-2) , Nairam Félix De Barros (1) , Andrew Merchant (2) Water deficit is one of the abiotic stresses that most affects the growth and survival of Eucalyptus. Mechanisms used to tolerate water-limited environments influence the distribution of Eucalyptus species in their natural environment. Here, we take a physiological approach to pre-screen Eucalyptus plants for tolerance to drought. Ten different clones of E. urophylla and E. grandis × E. urophylla that are known to show contrasting responses to water deficit under field conditions, were grown in Clark's nutrient solution (WW, well-watered) and with polyethylene glycol (-1.0 MPa) to simulate water deficit (WD). Clones responded differently to drought with differentiated photosynthetic limitations in drought-treated clones. Photosynthetic rates, stomatal conductance, transpiration and internal CO2 concentrations were reduced in all genotypes under stress conditions. Clone i144 had a smaller reduction in the evaluated physiological traits, also showing increased root growth in WDtreated plants. Clones 3367 and i224, thought to be moderately tolerant, also followed these patterns. Clones gg157, 1568 and 1641, all of which are moderately sensitive under field conditions, reduced most of the physiological characters evaluated. However, clone gg157 demonstrated increased root system growth, even during short periods of water stress. Clones i042 and i182 were deemed drought-susceptible, with large reductions in photosynthesis and growth, despite showing a high increase in abscisic acid content presumably as a defense mechanism. Interaction between A (photosyntetic rate), E (transpiration rate), ETR/A (electrons transport rate/photosynthetic rate) and SDM/ RDM (shoot dry matter/root dry matter) demonstrated the most significant differences between WD-treated clones and offer great potential for use as selection criterion for water deficit-tolerant genotypes.

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“…O ferro (Fe), quando disponível na água utilizada na irrigação das culturas, precipita-se e acumula-se no solo, compreendendo muitas vezes a área irrigável (rizosfera), levando formação de placas de hidróxidos de Fe (concreções), além de inibir a absorção de outros nutrientes pelo sistema radicular, devido as propriedades físicas e químicas do elemento, que lhe conferem o potencial de 'puxar' os demais nutrientes, tornando-os indisponíveis as plantas e causando distúrbios nutricionais sobre a sua fisiologia (GUERRA et al, 2012;RUIZ, 2015;MÜLLER et al, 2017). Casierra-Posada et al (2017), avaliaram o efeito do excesso de ferro sobre o crescimento das plantas do sisal (Furcraea hexapetala (Jacq.)…”

Section: Genótiposunclassified

“…Plantas expostas a excessos de ferro, tendem a sofrer um tipo de estresse oxidativo, que leva a formação de radicais hidroxilas que originam intermediários reativos de oxigênio, reduzindo a eficiência fotossintética, necessitando que estudos sejam desenvolvidos para identificar genótipos tolerantes ou resistentes as condições adversas inferidas pelo excesso de ferro, devendo-se quantificar o grau de influência sobre o crescimento vegetal, principalmente em fruteiras, onde o caráter perene da cultura induz planejamento a longo prazo (DE OLIVEIRA JUCOSKI et al, 2013). Müller et al (2017), investigaram a tolerância de diferentes cultivares de arroz (Oryza spp.) (Poaceae) ao estresse excesso de Fe, e constataram que as altas concentrações de ferro (Fe) causam um estresse e levam a mudanças substanciais na acumulação de nutrientes nas plantas, limitando bioquimicamente a fotossíntese em arroz, o que varia em função dos diferentes mecanismos de tolerância exibidos pelas cultivares (genótipos), como constatou-se no presente estudo, onde o citrandarin 'San Diego' apresentou maior tolerância que o citrandarin 'Riverside', mesmo considerando que ambos são híbridos pertencentes à mesma família botânica, o que pode ser uma característica agronômica desejável para implantação de pomares em condições parciais, ou regiões, com tendência a exibirem concentrações elevadas de ferro (Fe), e consequentemente, com capacidade de afetar o desenvolvimento vegetal e a produção agrícola.…”

Section: Genótiposunclassified

Excesso De Ferro Sobre O Desenvolvimento De Porta-Enxertos Cítricos

Sombra

Oliveira

Ferreira

et al. 2019

NAT

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O trabalho objetivou avaliar os efeitos do excesso de ferro sobre a emergência e desenvolvimento inicial de genótipos de porta-enxertos cítricos. Adotou-se delineamento em blocos casualizados (DBC), em fatorial 5x2, com cinco porta-enxertos e dois substratos, repetidos quatro vezes, com parcela útil de 15 recipientes. Os genótipos consistiram do limoeiro ‘Cravo Santa Cruz’; citrandarins ‘Riverside’, ‘San Diego’ e ‘Índio’, além de, tangerineira ‘Sunki Tropical’, cultivados com ou sem óxido de ferro no substrato. Analisaram-se as porcentagens de emergência (PE) e calculou-se o índice de velocidade de emergência (IVE). Realizaram-se biometrias aos 30, 60 e 90 dias após a semeadura (DAS), mensurando-se a altura (H) e diâmetro de caule (D) das plântulas, determinando-se massa fresca (MV) e seca (MS). O excesso de ferro induziu subdesenvolvimento, e até mortalidade de plântulas já emergidas, o que refletiu diretamente nos resultados, porém, todos os genótipos apresentaram emergência superior a 75%, destacando-se o citrandarin ‘San Diego’, com maior altura e caule mais espesso, e o citrandarin ‘Riverside’ com maior sensibilidade ao estresse, registrando os menores valores. O citrandarin ’San Diego’ demonstrou tolerância o estresse e desenvolveu-se satisfatoriamente, necessitando estudos que avaliem a manutenção das características inferidas em combinação com a cultivar copa.Palavras-chave: ambiente protegido, citricultura, enxertia, estresse, mudas. EXCESS OF IRON ON THE DEVELOPMENT OF CITRUS ROOTSTOCKS ABSTRACT: The objective of this work was evaluated the effects of iron excess on the emergence and initial development of citrus rootstock genotypes. A randomized complete block design (DBC), factorial 5x2, with five rootstocks and two substrates, repeated four times, with useful plot of 15 containers was adopted. Genotypes consisted of the 'Santa Cruz' Rangpur lemon; 'Riverside', 'San Diego' and 'Indio' citrandarins, as well as 'Sunki Tropical' tangerine, grown with or without iron excess in substrate. The percentages of emergency (PE) were analyzed and the rate of emergency (IVE) was calculated. Biometry was performed at 30, 60 and 90 days after sowing (DAS), by measuring the height (H) and stem diameter (D) of the seedlings, determining fresh (MV) and dry mass (DM). The excess of iron induced underdevelopment, and even mortality of already emerged seedlings, which reflected directly in the results, however, all genotypes presented an emergency higher to 75%, standing out ’San Diego’ citrandarin, with greater height and more stem thick, and the ‘Riverside’ citrandarin with greater sensitivity to stress, registering the lowest values. 'San Diego’ citrandarin demonstrated stress tolerance and developed satisfactorily, requiring studies that evaluate maintenance of inferred characteristics in combination with cultivar canopy.Keywords: protected environment, citriculture, grafting, stress, seedlings.

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Ecophysiological responses to excess iron in lowland and upland rice cultivars

Cited by 37 publications

References 75 publications

Continuous Flooding or Alternate Wetting and Drying Differently Affect the Accumulation of Health-Promoting Phytochemicals and Minerals in Rice Brown Grain

Continuous Flooding or Alternate Wetting and Drying Differently Affect the Accumulation of Health-Promoting Phytochemicals and Minerals in Rice Brown Grain

A physiological approach for pre-selection of Eucalyptus clones resistant to drought

Excesso De Ferro Sobre O Desenvolvimento De Porta-Enxertos Cítricos

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