Plant Growth Regulators and Induction of Leaf Senescence in Nitrogen-Deprived Wheat Plants

Criado, María V.; Roberts, Irma N.; Echeverría, Mariela; Barneix, Atilio J.

doi:10.1007/s00344-007-9016-5

Cited by 36 publications

(27 citation statements)

References 34 publications

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“…Under low N supply, coffee plants exhibited higher MDA and electrolyte leakage values than plants supplied with high concentrations of N, irrespective of the light fl uency (Pompelli et al 2010 ) . Similar responses were recorded for mulberry shrubs ( Morus alba ; Tewari et al 2007 ) and wheat ( Triticum aestivum ;Criado et al 2007 ) under N deprivation, showing increases in MDA and decreases in chlorophyll and protein contents in comparison to well-fed controls.…”

Section: Oxidative Damage In Citrus Under Stresssupporting

confidence: 74%

“…Low nitrogen supply in wheat was associated to an early drop in isopentenyl adenosine (iPA) concentration and a later increase in ABA levels accompanied by a rise in H 2 O 2 and MDA production. While iPA decrease was concomitant with reductions in protein concentration, ABA was correlated with senescence and the accumulation of ROS (Criado et al 2007 ) . Increasing evidence indicates that ROS mediate plant physiological changes to adapt to different environmental conditions (not necessarily stressful).…”

Section: Role Of Ros As Signaling Molecules and Interaction With Planmentioning

confidence: 95%

“…This reduction was not associated to an induction of antioxidant activities but rather to the activation of photoprotective mechanisms contributing to the dissipation of excess irradiative energy and resulting in no measurable effect on CO 2 fi xation. In wheat plants, nitrogen deprivation caused a reduction in chlorophyll and rubisco contents as well as in CAT and APX activities, resulting in a moderate MDA increase (Criado et al 2007 ) . These results indicate that regulation of the photosynthetic system might be a common strategy to cope with oxidative stress associated to low N supply in coffee, wheat, and citrus.…”

Section: Nitrogenmentioning

confidence: 97%

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Antioxidant System in Citrus Under Nutrient Stress Conditions: Latest Developments

Arbona

2012

Advances in Citrus Nutrition

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Natural distribution of mineral nutrients in the earth crust is a crucial factor that determines the distribution of plant species favoring the spreading of species with speci fi c adaptations to nutrient de fi ciency or excess. Throughout years, humans have learned how to provide nutrients to poorly fertilized soils and, to some extent, how to regulate absorption of certain nutrients when these are present in excess in the substrate. However, this has led also to an overfertilization of certain areas therefore contaminating arable soils and aquifers. In plants, both excess and de fi cient fertilization induce alterations in metabolism growth and reproductive development. The extent to which the nutrient imbalance affects plant physiology depends on the speci fi c nutrient and the relative tolerance of the plant species. In addition, nutrients might also interact with each other, depending on their relative concentration, leading to nonexpected alterations in plants. For these reasons, nutrient imbalances are considered a source of abiotic stress in crop plants. As for other abiotic stress conditions such as salinity, soil waterlogging, heat, plants respond by modulating their photosynthetic metabolism and subsequently overproducing highly reactive oxidative subproducts as a secondary source of stress. In this sense, some of the macroscopic effects observed in plants subjected to nutritional imbalances (e.g., necrotic spots, chlorosis) could be a direct (or indirect) result of the production and accumulation of these substances. In this chapter, the effects of nutritional imbalances on oxidative stress are reviewed, focusing on citrus and providing examples on other crops or Arabidopsis thaliana . AbstractNutritional imbalances are important factors that determine the distribution of natural populations of plants. However, in crop plants, alterations in nutrient levels limit vegetative growth, development and ultimately affect yield and production quality. In citrus, this is a relevant aspect due to the economic importance of this fruit tree. As other abiotic stress factors, nutrient imbalances affect the redox state of the cells by altering normal electron fl ow through transport chains (chloroplastic and/or mitochondrial) or impairing reactive oxygen species scavenging ability of plants. In this chapter, the effects of macro-and micronutrient imbalances on citrus cell redox state are reviewed, paying special attention to the defense and detoxi fi cation mechanisms involved. In addition, the role of reactive oxygen species as signaling compounds alone or associated with plant hormones is discussed.

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Section: Oxidative Damage In Citrus Under Stresssupporting

confidence: 74%

Section: Role Of Ros As Signaling Molecules and Interaction With Planmentioning

confidence: 95%

Section: Nitrogenmentioning

confidence: 97%

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Antioxidant System in Citrus Under Nutrient Stress Conditions: Latest Developments

Arbona

2012

Advances in Citrus Nutrition

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“…The degradation of proteins with time is one of the main symptoms of plant senescence (Lohman et al, 1994;Criado et al, 2007;Rolny et al, 2011). Plant senescence is often associated with increased oxidative damage (Procházková and Wilhelmová, 2007).…”

Section: Discussionmentioning

confidence: 99%

Responses in root physiological characteristics ofVallisneria natans(Hydrocharitaceae) to increasing nutrient loadings

Cai

Yao

Gao

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

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-We selected the submerged macrophyte Vallisneria natans (Lour.) Hara for investigating the effects of nutrient loadings (nitrogen (N)-phosphorus (P) in mg·L−1 : (1) 0.5, 0.05; (2) 1.0, 0.1; (3) 5.0, 0.5; (4) 10.0, 1.0) on root physiological characteristics using sand culture during the growth season (June to October). Results showed that the best root growth was in macrophytes exposed to moderate nutrient conditions (N-P 2, in 1.0 and 0.10 mg· L −1 ), and high nutrient loadings induced declines in root growth. Analysis of root antioxidant enzyme (superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT)) activities, protein content and cell ultrastructure revealed that the root of V. natans was subject to the stress of senescence during the end of the growth season. Moreover, high nutrient loadings increased oxidative stress in aging roots of V. natans, and made the cell ultrastructure of roots vulnerable to damage during senescence. The results for the changes in CAT activity suggest that CAT can serve as an important component of antioxidant defense mechanism in aging roots of V. natans to protect against nutrient loading induced oxidative injury in the early period. Key-words:Nutrient loading / oxidative stress / physiological response / root / Vallisneria natans Résumé -Réponses dans les caractéristiques physiologiques des racines de Vallisneria natans (Hydrocharitaceae) à l'augmentation des charges en éléments nutritifs. Nous avons choisi le macrophyte submergé Vallisneria natans (Lour.) Hara pour étudier les effets des charges d'éléments nutritifs (azote (N)-phosphore (P) en mg·L −1 : (1) de 0,5, 0,05 ; (2) 1,0 0,1 ; (3) 5.0, 0.5 ; (4) 10.0, 1.0) sur les caractéristiques physiologiques des racines en utilisant une culture sur sable pendant la saison de croissance (juin à octobre). Les résultats ont montré que la croissance des racines était la meilleure pour les macrophytes exposées à des conditions modérées de nutriments (NP (2), 1,0 et 0,10 mg·L −1 ), et que des charges élevées en éléments nutritifs induisaient une baisse de la croissance des racines. L'analyse de l'activité des enzymes antioxydantes des racines (superoxyde dismutase (SOD), peroxydase (POD) et catalase (CAT)), de la teneur en protéines et de l'ultrastructure cellulaire ont révélé que la racine de V. natans était soumise à la contrainte de la sénescence au cours de la fin de la saison de croissance. En outre, des charges élevées en nutriments augmentaient le stress oxydatif dans le vieillissement des racines de V. natans, et rendaient l'ultrastructure cellulaire des racines vulnérable aux dommages pendant la sénescence. Les résultats sur les changements dans l'activité CAT suggéraient que CAT peut servir comme une composante importante du mécanisme de défense antioxydante dans le vieillissement des racines de V. natans pour se protéger contre la charge en nutriments induisant des lésions oxydatives dans la période initiale. Mots-clés :Charge en éléments nutritifs / stress oxydatif / réponse physiologique / racine / Vallisn...

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“…The external cues include stresses such as drought, nutrient deficiency, and shading. Among these stresses, limited N availability is one of the main causes promoting proteolysis and N remobilization and, ultimately, senescence in field-grown wheat plants (Crafts-Brandner et al 1998;Criado et al 2007; Gan and Amasino 1997), while higher N inhibited both the proteolytic activity and N remobilization (Kong et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Signal transduction during wheat grain development

Kong

Guo

Sun

2015

Planta

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This review examines the signaling pathways from the developmental and environmental point of view and the interactions among external conditions, hormonal regulations, and sugarsensing in wheat. Grain development is the key phase of reproductive growth that is closely associated with vegetative organ senescence, initiation of grain filling, pre-stored assimilates remobilization, and maturation. Senescence is characterized by loss of chlorophyll and the degradation of proteins, nucleic acids, lipids as well as nutrient exports to the sink. The initiation and progression of vegetative organ senescence are under the control of an array of environmental signals (such as biotic and abiotic stresses, darkness, and nutrient availability) and endogenous factors (including aging, multiple hormones, and sugar availability). This review will discuss the major breakthroughs in signal transduction for the wheat (Triticum aestivum) grain development achieved in the past several years, with focuses on the regulation of senescence, reserves remobilization and biosynthesis of main components of the grain. Different mechanisms of diverse signals in controlling different phrases of wheat grain development, and cross talks between different signaling pathways will also be discussed. For perspectives, key signaling networks for grain development remain to be elucidated, including cross talks and the interactions between various environmental factors and internal signals.

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Plant Growth Regulators and Induction of Leaf Senescence in Nitrogen-Deprived Wheat Plants

Cited by 36 publications

References 34 publications

Antioxidant System in Citrus Under Nutrient Stress Conditions: Latest Developments

Antioxidant System in Citrus Under Nutrient Stress Conditions: Latest Developments

Responses in root physiological characteristics ofVallisneria natans(Hydrocharitaceae) to increasing nutrient loadings

Signal transduction during wheat grain development

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