Effect of water deficit on the cell wall of the date palm (<i><scp>P</scp>hoenix dactylifera</i> ‘<scp>D</scp>eglet nour’, <scp>A</scp>recales) fruit during development

Gribaa, Ali; Dardelle, Flavien; Lehner, Arnaud; Rihouey, Christophe; Burel, Carole; Ferchichi, Ali; Driouich, Azeddine; Mollet, Jean‐Claude

doi:10.1111/pce.12042

Cited by 42 publications

(30 citation statements)

References 101 publications

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“…Pectin content and its degradation affect cell wall integrity, which is closely linked with abiotic stress sensitivity38. It was reported that polysaccharide remodeling is an important process that controls the mechanical properties of the cell wall and the water status of plant cells under water deficit39. Here, we showed that CH 4 pretreatment can slightly increase the pectin contents in ZD958 under PEG stress (Supplementary Fig.…”

Section: Discussionmentioning

confidence: 55%

Methane protects against polyethylene glycol-induced osmotic stress in maize by improving sugar and ascorbic acid metabolism

Han

Duan

Wang

et al. 2017

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Although aerobic methane (CH 4 ) release from plants leads to an intense scientific and public controversy in the recent years, the potential functions of endogenous CH 4 production in plants are still largely unknown. Here, we reported that polyethylene glycol (PEG)-induced osmotic stress significantly increased CH 4 production and soluble sugar contents in maize (Zea mays L.) root tissues. These enhancements were more pronounced in the drought stress-tolerant cultivar Zhengdan 958 (ZD958) than in the drought stress-sensitive cultivar Zhongjiangyu No.1 (ZJY1). Exogenously applied 0.65 mM CH 4 not only increased endogenous CH 4 production, but also decreased the contents of thiobarbituric acid reactive substances. PEG-induced water deficit symptoms, such as decreased biomass and relative water contents in both root and shoot tissues, were also alleviated. These beneficial responses paralleled the increases in the contents of soluble sugar and the reduced ascorbic acid (AsA), and the ratio of AsA/dehydroascorbate (DHA). Further comparison of transcript profiles of some key enzymes in sugar and AsA metabolism suggested that CH 4 might participate in sugar signaling, which in turn increased AsA production and recycling. Together, these results suggested that CH 4 might function as a gaseous molecule that enhances osmotic stress tolerance in maize by modulating sugar and AsA metabolism.Methane (CH 4 ) is the most abundant reduced organic compound in the atmosphere, and also the second important greenhouse gas after carbon dioxide 1,2 . It was previously considered as a degradation product of organic substance by microbes under anoxic conditions 3 . Keppler et al. 4 further reported a surprising discovery that terrestrial plants can produce CH 4 under aerobic conditions. Although much controversy and debate followed this original work, a number of researchers have attempted to provide alternate explanations of the aerobic CH 4 formation from plants using different scales of measurement 5 . In fact, the non-microbial CH 4 production from plants constitutes a significant fraction of the global CH 4 sources 2,6 . A comprehensive understanding of CH 4 in plants is that the living plants and fungi can not only emit CH 4 to the atmosphere 7 , but also produce CH 4 in plants in vivo 8 . Interestingly, this phenomenon was observed in the researches of nitric oxide 9 , carbon monoxide 10 , as well as hydrogen gas 11 . In some plant species, several chemical compounds, such as lignin, cellulose, leaf surface wax, ascorbic acid (AsA), the methyl groups of sulphur-containing amino acid methionine (Met), were suggested to be the potential precursors of CH 4 2,5,12,13 .

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Section: Discussionmentioning

confidence: 55%

Methane protects against polyethylene glycol-induced osmotic stress in maize by improving sugar and ascorbic acid metabolism

Han

Duan

Wang

et al. 2017

Sci Rep

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“…These enzymes are regulated by specific inhibitors (PMEIs). Group 2 PMEs contain, in addition to the catalytic domain, an N-terminal extension domain, PRO, which has some similarity to known PMEI domains such as PME2 (Gribaa et al, 2013). The clearly higher transcript abundance of two PMEI family genes and two genes coding for PMEI domaincontaining proteins in the roots of the arf10/16 double mutant exposed to Al (Figure 8; Supplemental Data Set 4) may reflect a higher degree of pectin methylation and, thus, a reduced rate of Al accumulation ( Figure 7D) compared with wild-type roots.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, once the cell wall structure proteins have been deposited, the expression of genes involved in wall polysaccharide remodeling (such as those encoding glycosyl hydrolases and polysaccharide lyases) can be expected to be promoted, as was indeed the case ( Figure 8B; Supplemental Data Set 4). An outcome of this burst of gene expression is to facilitate cell wall enlargement (Gribaa et al, 2013). The upregulation of CELLULOSE SYNTHASE-LIKE PRO-TEIN B2, coding for a protein involved in cellulose synthesis, may have led to the reduced inhibition of growth in the double mutant roots, while the repression of XTH31 and XTH7, genes that encode xyloglucan endotransglucosylase/hydrolases, may have alleviated Al toxicity by reducing the xyloglucan content of the cell wall, thereby lowering its Al binding capacity (Zhu et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

TAA1-Regulated Local Auxin Biosynthesis in the Root-Apex Transition Zone Mediates the Aluminum-Induced Inhibition of Root Growth inArabidopsis

et al. 2014

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The transition zone (TZ) of the root apex is the perception site of Al toxicity. Here, we show that exposure of Arabidopsis thaliana roots to Al induces a localized enhancement of auxin signaling in the root-apex TZ that is dependent on TAA1, which encodes a Trp aminotransferase and regulates auxin biosynthesis. TAA1 is specifically upregulated in the root-apex TZ in response to Al treatment, thus mediating local auxin biosynthesis and inhibition of root growth. The TAA1-regulated local auxin biosynthesis in the root-apex TZ in response to Al stress is dependent on ethylene, as revealed by manipulating ethylene homeostasis via the precursor of ethylene biosynthesis 1-aminocyclopropane-1-carboxylic acid, the inhibitor of ethylene biosynthesis aminoethoxyvinylglycine, or mutant analysis. In response to Al stress, ethylene signaling locally upregulates TAA1 expression and thus auxin responses in the TZ and results in auxin-regulated root growth inhibition through a number of auxin response factors (ARFs). In particular, ARF10 and ARF16 are important in the regulation of cell wall modification-related genes. Our study suggests a mechanism underlying how environmental cues affect root growth plasticity through influencing local auxin biosynthesis and signaling.

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“…Dry samples were analyzed with an OMNI-Sampler FT-IR spectroscope (version 5.2a) at 4 cm 21 resolution. The DM was calculated using the absorbance intensities at 1,630 and 1,740 cm 21 assigned to the vibration of carboxyl groups of (1,4)-a-D-GalUA and its methylester form, respectively (Gribaa et al, 2013), using the equation described by Gnanasambandam and Proctor (2000) and Manrique and Lajolo (2002): DM = A 1,740 /(A 1,740 + A 1,630 ). Commercial pectins with determined DM were used as controls.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

PECTIN METHYLESTERASE48 Is Involved in Arabidopsis Pollen Grain Germination

et al. 2014

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Germination of pollen grains is a crucial step in plant reproduction. However, the molecular mechanisms involved remain unclear. We investigated the role of PECTIN METHYLESTERASE48 (PME48), an enzyme implicated in the remodeling of pectins in Arabidopsis (Arabidopsis thaliana) pollen. A combination of functional genomics, gene expression, in vivo and in vitro pollen germination, immunolabeling, and biochemical analyses was used on wild-type and Atpme48 mutant plants. We showed that AtPME48 is specifically expressed in the male gametophyte and is the second most expressed PME in dry and imbibed pollen grains. Pollen grains from homozygous mutant lines displayed a significant delay in imbibition and germination in vitro and in vivo. Moreover, numerous pollen grains showed two tips emerging instead of one in the wild type. Immunolabeling and Fourier transform infrared analyses showed that the degree of methylesterification of the homogalacturonan was higher in pme482/2 pollen grains. In contrast, the PME activity was lower in pme482/2, partly due to a reduction of PME48 activity revealed by zymogram. Interestingly, the wild-type phenotype was restored in pme482/2 with the optimum germination medium supplemented with 2.5 mM calcium chloride, suggesting that in the wild-type pollen, the weakly methylesterified homogalacturonan is a source of Ca 2+ necessary for pollen germination. Although pollen-specific PMEs are traditionally associated with pollen tube elongation, this study provides strong evidence that PME48 impacts the mechanical properties of the intine wall during maturation of the pollen grain, which, in turn, influences pollen grain germination.

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Effect of water deficit on the cell wall of the date palm (Phoenix dactylifera ‘Deglet nour’, Arecales) fruit during development

Cited by 42 publications

References 101 publications

Methane protects against polyethylene glycol-induced osmotic stress in maize by improving sugar and ascorbic acid metabolism

Methane protects against polyethylene glycol-induced osmotic stress in maize by improving sugar and ascorbic acid metabolism

TAA1-Regulated Local Auxin Biosynthesis in the Root-Apex Transition Zone Mediates the Aluminum-Induced Inhibition of Root Growth inArabidopsis

PECTIN METHYLESTERASE48 Is Involved in Arabidopsis Pollen Grain Germination

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