Sensing and signalling during plant flooding

Dat, James F.; Capelli, Nicolas; Folzer, Hélène; Bourgeade, Pascale; Badot, Pierre‐Marie

doi:10.1016/j.plaphy.2004.02.003

Cited by 216 publications

(140 citation statements)

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“…According to Abreu et al (2007), in soils with deficient drainage, compacted soils and those with pH values less than 5.5, Mn contents in the soil may reach levels which are toxic to plants. Studies show a close relationship between the Eh changes of flooded soils and plant metabolism, due to the increase in availability of ions such as Mn, Fe and Cu (Hauck et al, 2003;Dat et al, 2004;Shenker et al, 2004). Under conditions of excess Mn, there may be a decrease in uptake of other cations (Ca, Fe and Mg) and in the photosynthetic rate, and an increase in the activity of antioxidant enzymes, among them, superoxide dismutase (SOD), catalase and peroxidases (Wang et al, 2009;Mou et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Manganese accumulation and its relation to "eucalyptus shoot blight in the Vale do Rio Doce"

Leite¹,

Novais

Silva

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYEucalyptus Shoot Blight in the Vale do Rio Doce (ESBVRD) is an anomaly that leads to reduced growth and, in more extreme cases, to death of eucalyptus plants. Initially diagnosed in plantations in the region of the Vale do Rio Doce, in the State of Minas Gerais, Brazil, this problem has also been found in plantations in other regions of the country and even in other countries. Although the symptoms of this anomaly are well-known, its causes are not yet understood. The aim of this study was to evaluate the cause-effect relationship between accumulation of manganese (Mn) in eucalyptus clones and ESBVRD. Characterization of the environment in areas of greater occurrence of this problem in regard to soil, climate and fluctuation of the water table was undertaken in eucalyptus plantations of the Celulose Nipobrasileira S.A. (Cenibra) company in the region of the Vale do Rio Doce. Plant tissues were sampled in two situations. In the first situation, diagnosis occurred in the initial phase of the anomaly in clones with differentiated tolerance to the problem; in the second situation, diagnosis was made in a single clone, considered to be sensitive, in two time periods -in the phase with the strong presence of symptoms and in the recovery phase, in areas of occurrence and in areas of escape from the problem. The most ESBVRD-sensitive clone showed much higher (4.8 times higher) leaf Mn contents than more tolerant clones. In plants with the anomaly, Mn leaf contents were greater than 3,070 mg kg -1 , much greater than the quantity found in those without the anomaly (734 mg kg -1 ). In the period in which the symptoms began to wane, there was a sharp decline in leaf Mn contents, from 2,194 to 847 mg kg -1 .(1) Received for publication on February 27, 2013 and approved on October 25, 2013.(2) Researcher, Coordenação de Pesquisa e Desenvolvimento Florestal (GGF-P), Celulose Nipo-Brasileira S.A. -CENIBRA.Regional Manganese content in the above ground part and plant litter (44.4 g ha -1 ) in the area of occurrence of the anomaly was three times greater than that found in these same components (14.1 g ha -1 ) in the area of absence of the symptom. Based on the evidence found, such as the existence of environmental conditions favorable to high Mn availability to the plants in the areas of greatest incidence of ESBVRD, greater uptake of Mn in sensitive clones and in plants with symptoms, and a synchronism between the intensity of symptoms of ESBVRD and leaf Mn contents, it may be inferred that temporary excess of Mn in eucalyptus plants is closely related to ESBVRD.Index terms: hypoxia, groundwater, redox potential. RESUMO: ACÚMULO DE MANGANÊS EM PLANTIOS DE EUCALIPTO E SUA RELAÇÃO COM A "SECA DE PONTEIROS DO EUCALIPTO DO VALE DO RIO DOCE"A Seca de Ponteiros do Eucalipto do Vale do Rio Doce (SPEVRD) é uma anomalia que leva à redução do crescimento e, em casos mais extremos, à morte dessa cultura. Inicialmente diagnosticada em plantios localizados na região do Vale do Rio Doce, no Estado de Minas Gerais, Brasil, esse proble...

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Section: Introductionmentioning

confidence: 99%

Manganese accumulation and its relation to "eucalyptus shoot blight in the Vale do Rio Doce"

Leite¹,

Novais

Silva

et al. 2014

Rev. Bras. Ciênc. Solo

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“…Since gases diffuse 10,000 times faster in the air than in the water, an impoverishment of oxygen availability (hypoxia) results both in the soil and in the plant parts (Dat et al, 2004). Under oxygen restriction, the tricarboxylic acid cycle is interrupted due to the absence of reducing power, and the anaerobic metabolism is activated (Sairam et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding

Souza

Magalhães

Pereira

et al. 2010

Pesq. agropec. bras.

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-The objective of this work was to assess the effect of successive selection cycles on leaf plasticity of 'Saracura' maize BRS-4154 under periodical flooding in field conditions. Soil flooding started at the six-leaf stage with the application of a 20-cm depth water layer three times a week. At flowering, samples of leaves were collected and fixed. Paradermic and transverse sections were observed under photonic microscope. Several changes were observed throughout the selection cycles, such as modifications in the number and size of the stomata, higher amount of vascular bundles and the resulting decrease of the distance between them, smaller diameter of the metaxylem, decrease of cuticle and epidermis thickness, decrease of number and size of bulliform cells, increase of phloem thickness, smaller sclerenchyma area. Therefore, the successive selection cycles of 'Saracura' maize resulted in changes in the leaf anatomy, which might be favorable to the plant's tolerance to the intermittent flooding of the soil.Index terms: Zea mays, hypoxia, leaf anatomy, tolerance to flooding. Plasticidade foliar nos sucessivos ciclos de seleção do milho'Saracura' em resposta ao alagamento intermitente do soloResumo -O objetivo deste trabalho foi avaliar o efeito de sucessivos ciclos de seleção na plasticidade foliar do milho 'Saracura' BRS-4154 sob alagamento intermitente do solo em condições de campo. O alagamento do solo iniciou-se no estádio de seis folhas com a aplicação de uma lâmina de 20 cm de água três vezes por semana. No florescimento, foram coletadas e fixadas amostras das folhas. Secções paradérmicas e transversais de amostras foram observadas em microscópio fotônico. Várias modificações foram observadas durante os ciclos de seleção, como o número e o tamanho dos estômatos, a maior quantidade de feixes vasculares e a consequente diminuição da distância entre eles, o metaxilema com diâmetros menores, a diminuição da espessura da cutícula e da epiderme, a diminuição no número e tamanho das células buliformes, o aumento da espessura do floema e a menor área de esclerênquima. Os sucessivos ciclos de seleção do milho 'Saracura', portanto, levaram a mudanças na anatomia foliar, as quais podem ser favoráveis à tolerância da planta ao alagamento intermitente do solo.Termos para indexação: Zea mays, hipoxia, anatomia foliar, tolerância ao alagamento.

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“…Therefore, there is an increase in reactive oxygen species (ROS) as by-product of respiratory metabolism (DAT et al, 2004), which was increased with temperature stress, resulting in rapid degradation of seed reserves and more vigorous seedlings as well as low activities of SOD, CAT and APX, as a survival strategy to the stress imposed. The lower activity of the SOD in the seedlings obtained from seeds subjected to extreme temperatures (15 and 40°C), may be related to the increased levels of H 2 O 2 because it is capable of inactivating enzymes by oxidizing thiol groups (BOWLER et al, 1994).…”

Section: Resultsmentioning

confidence: 99%