The Control of Storage Xyloglucan Mobilization in Cotyledons of <i>Hymenaea courbaril</i>

Santos, Henrique Pessoa dos; Purgatto, Eduardo; Mercier, Helenice; Buckeridge, Marcos Silveira

doi:10.1104/pp.104.040220

Cited by 42 publications

(54 citation statements)

References 52 publications

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“…O transporte das auxinas parece ser realmente crucial para as respostas ao alagamento e isto foi demonstrado por McDonald & Visser (2003), que usaram um inibidor de transporte de auxina (ácido naftilftalâmico -NPA) e verificaram uma diminuição na produção de raízes adventícias. Uma possível explicação é a falta do sinal dado pela auxina para a mobilização de reservas de carbono (ver também Santos et al 2004) nas raízes, reservas estas que serão utilizadas para o desenvolvimento das raízes adventícias.…”

Section: Sinalização Metabólica E Hormonal Durante O Alagamentounclassified

Respostas fisiológicas de plantas amazônicas de regiões alagadas às mudanças climáticas globais

Grandis¹,

Godoi²,

Buckeridge³

2010

Rev. bras. Bot.

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-(Physiological responses of Amazonian flooded plants to the global climate change). According to the last report of IPCC (Intergovernmental Panel of Climatic Change, 2007) an increase in atmospheric CO 2 concentration to ca. 0.072% is predicted to occur until the middle of this century. As a result, a tandem elevation of temperature of ca. +3 °C and a decrease in precipitation are to be expected. It has also been suggested that this scenario may lead to a gradual substitution of the tropical forest for savanna-like vegetation in Eastern parts of the Amazon. Within this perspective, a worth question is how the tree species that make up the Amazonian floodplains will respond to the global climatic change? Although predictions have been quite pessimistic, flooding of part of the Amazon will continue to occur for several years and it is important to understand its synergistic effects within the scenario of climate change. In this work, features related to plant metabolism and hormonal signaling during flooding is revised, and the possible effects that the climatic changes might have on plants from the Amazon are discussed. The information available in the literature suggests that under flooding, plants tend to mobilize storage compounds to supply carbon demand needed for maintenance metabolism under the effect of stress caused by the lack of oxygen. In contrast, under elevated CO 2 concentration, plants tend to increase photosynthesis and biomass. With an increase of about 3 °C these parameters may increase even more. Alternatively, with flooding, there is a general decrease in growth potential and it is possible that while favorable conditions of elevated CO 2 and temperature prevail, the positive effects may be counterbalanced by the negative effects of flooding. Thus, the physiological responses might be imperceptible or promote further growth up to the middle of the 21 st Century for most species that occur in the floodplains. However, if temperature and CO 2 levels surpass the threshold of optimal conditions for most plants, a decrease in physiological activity is to be expected.

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Section: Sinalização Metabólica E Hormonal Durante O Alagamentounclassified

Respostas fisiológicas de plantas amazônicas de regiões alagadas às mudanças climáticas globais

Grandis¹,

Godoi²,

Buckeridge³

2010

Rev. bras. Bot.

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“…Auxin is the principal hormone that controls xyloglucan storage mobilization (Hensel et al, 1991;dos Santos et al, 2004;Brandão et al, 2009). In H. courbaril, when seedlings were subjected to treatment with napthylphthalamic acid (an inhibitor of auxin transport), xyloglucan disassembly was arrested (dos Santos et al, 2004).…”

Section: Xyloglucanmentioning

confidence: 99%

Seed Cell Wall Storage Polysaccharides: Models to Understand Cell Wall Biosynthesis and Degradation

2010

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Cell wall storage polysaccharides (CWSPs) are found as the principal storage compounds in seeds of many taxonomically important groups of plants. These groups developed extremely efficient biochemical mechanisms to disassemble cell walls and use the products of hydrolysis for growth. To accumulate these storage polymers, developing seeds also contain relatively high activities of noncellulosic polysaccharide synthases and thus are interesting models to seek the discovery of genes and enzymes related to polysaccharide biosynthesis. CWSP systems offer opportunities to understand phenomena ranging from polysaccharide deposition during seed maturation to the control of source-sink relationship in developing seedlings. By studying polysaccharide biosynthesis and degradation and the consequences for cell and physiological behavior, we can use these models to develop future biotechnological applications. CWSPs IN ENDOSPERMSGalactomannans and the Mannan Family

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“…ABA and IAA were purified by HPLC and quantified by gas chromatography-tandem mass spectrometry-selected ion monitoring based on Santos et al (2004), with some modifications. For ABA and IAA quantification, frozen leaf samples were ground in liquid nitrogen, extracted in 5 volumes (v/w) of cold 80% (v/v) methanol containing 146 mM butylhydroxytoluene, and stirred for 60 h at 4°C.…”

Section: Hormonal Analysismentioning

confidence: 99%

Nitric Oxide Mediates the Hormonal Control of Crassulacean Acid Metabolism Expression in Young Pineapple Plants

Freschi¹,

Rodrigues²,

Domingues³

et al. 2010

Plant Physiol.

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Genotypic, developmental, and environmental factors converge to determine the degree of Crassulacean acid metabolism (CAM) expression. To characterize the signaling events controlling CAM expression in young pineapple (Ananas comosus) plants, this photosynthetic pathway was modulated through manipulations in water availability. Rapid, intense, and completely reversible up-regulation in CAM expression was triggered by water deficit, as indicated by the rise in nocturnal malate accumulation and in the expression and activity of important CAM enzymes. During both up-and down-regulation of CAM, the degree of CAM expression was positively and negatively correlated with the endogenous levels of abscisic acid (ABA) and cytokinins, respectively. When exogenously applied, ABA stimulated and cytokinins repressed the expression of CAM. However, inhibition of water deficit-induced ABA accumulation did not block the up-regulation of CAM, suggesting that a parallel, non-ABA-dependent signaling route was also operating. Moreover, strong evidence revealed that nitric oxide (NO) may fulfill an important role during CAM signaling. Up-regulation of CAM was clearly observed in NO-treated plants, and a conspicuous temporal and spatial correlation was also evident between NO production and CAM expression. Removal of NO from the tissues either by adding NO scavenger or by inhibiting NO production significantly impaired ABA-induced up-regulation of CAM, indicating that NO likely acts as a key downstream component in the ABA-dependent signaling pathway. Finally, tungstate or glutamine inhibition of the NO-generating enzyme nitrate reductase completely blocked NO production during ABA-induced up-regulation of CAM, characterizing this enzyme as responsible for NO synthesis during CAM signaling in pineapple plants.

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The Control of Storage Xyloglucan Mobilization in Cotyledons of Hymenaea courbaril

Cited by 42 publications

References 52 publications

Respostas fisiológicas de plantas amazônicas de regiões alagadas às mudanças climáticas globais

Respostas fisiológicas de plantas amazônicas de regiões alagadas às mudanças climáticas globais

Seed Cell Wall Storage Polysaccharides: Models to Understand Cell Wall Biosynthesis and Degradation

Nitric Oxide Mediates the Hormonal Control of Crassulacean Acid Metabolism Expression in Young Pineapple Plants

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