Root growth and lignification of two wheat species differing in their sensitivity to NaCl, in response to salt stress

Jbir, Najoua; Chaïbi, Wided; Ammar, Saı̈da; Jemmali, Ahmed; Ayadi, A.

doi:10.1016/s0764-4469(01)01355-5

Cited by 76 publications

(56 citation statements)

References 21 publications

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“…It could come from cell wall phenolics that might participate in oxidatively mediated cross-links with the formation of condensed bonds in lignins and of diferulic units (Grabber et al, 2000). In agreement with this hypothesis, all peroxidase activities reported so far increased in response to salt stress in wheat root cells (Jbir et al, 2001).…”

Section: Discussionsupporting

confidence: 66%

Water Deficits Affect Caffeate O-Methyltransferase, Lignification, and Related Enzymes in Maize Leaves. A Proteomic Investigation

et al. 2005

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Drought is a major abiotic stress affecting all levels of plant organization and, in particular, leaf elongation. Several experiments were designed to study the effect of water deficits on maize (Zea mays) leaves at the protein level by taking into account the reduction of leaf elongation. Proteomic analyses of growing maize leaves allowed us to show that two isoforms of caffeic acid/ 5-hydroxyferulic 3-O-methyltransferase (COMT) accumulated mostly at 10 to 20 cm from the leaf point of insertion and that drought resulted in a shift of this region of maximal accumulation toward basal regions. We showed that this shift was due to the combined effect of reductions in growth and in total amounts of COMT. Several other enzymes involved in lignin and/or flavonoid synthesis (caffeoyl-CoA 3-O-methyltransferase, phenylalanine ammonia lyase, methylenetetrahydrofolate reductase, and several isoforms of S-adenosyl-L-methionine synthase and methionine synthase) were highly correlated with COMT, reinforcing the hypothesis that the zone of maximal accumulation corresponds to a zone of lignification. According to the accumulation profiles of the enzymes, lignification increases in leaves of control plants when their growth decreases before reaching their final size. Lignin levels analyzed by thioacidolysis confirmed that lignin is synthesized in the region where we observed the maximal accumulation of these enzymes. Consistent with the levels of these enzymes, we found that the lignin level was lower in leaves of plants subjected to water deficit than in those of well-watered plants.Drought is one of the major environmental factors decreasing plant productivity. It affects various metabolic processes but has scarcely been related to lignin biosynthesis. Lignin is a major polymer of plant cell walls that confers hydrophobicity and mechanical strength to the walls of conducting vessels to withstand the negative pressure generated by transpiration. Its variability has been comprehensively reviewed (Boudet et al

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Section: Discussionsupporting

confidence: 66%

Water Deficits Affect Caffeate O-Methyltransferase, Lignification, and Related Enzymes in Maize Leaves. A Proteomic Investigation

et al. 2005

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“…Lignin deposition inhibits cell elongation and eventually the growth of tissue or organ (Neves et al, 2010), indicating that the more reduced root DW in huckleberry compared with eggplant could be due to enhanced lignification in the root. However, under salt stress, this enhanced lignification could potentially contribute to the inhibition of Na influx into cells (Jbir et al 2001). This inhibition of Na + influx has been suggested as an adaptive mechanism to control root-to-shoot Na + delivery under salinity (Karahara et al, 2004;Krishnamurthy et al 2011), implying that the decreased activity of cwPOD in eggplant would correlate with reduced capacity for ROS detoxification as well as uncontrolled radial movement of solutes to the transpiration stream, thus allowing the free flow of Na + to the leaf, where it accumulates and causes oxidative stress damage.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, peroxidases ionically-bound to cell wall are involved in the synthesis of lignin, a constituent of the Casparian strip in the root, which functions in restricting the passage of solutes including Na + to the stele (Lee et al, 2013). Enhanced cwPOD under salinity has been found to protect plants by scavenging ROS (Maia et al, 2013), as well as correlates with enhanced deposition of lignin, which has been suggested to control the transport of Na + to the shoot (Jbir et al, 2001). Thus, cwPOD activity may be an important attribute in salinity stress tolerance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Stress on Na Accumulation, Antioxidant Enzyme Activities and Activity of Cell Wall Peroxidase of Huckleberry (Solanum scabrum) and Eggplant (Solanum melongena)

Assaha¹,

Liu²,

Mekawy³

et al. 2015

IJAB

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To cite this paper: Assaha, D.V.M., L. Liu, A.M.M. Mekawy, A. Ueda, T. Nagaoka and H. Saneoka, 2015. Effect of salt stress on Na accumulation, antioxidant enzyme activities and activity of cell wall peroxidase of huckleberry (Solanum scabrum) and eggplant (Solanum melongena AbstractUnderstanding the adaptive mechanisms to salinity stress is an important prerequisite for crop improvement and sustainable production. The objective of this study was to compare the adaptation of huckleberry and eggplant to salinity in terms of total dry weight, malondialdehyde (MDA) content, the activities of catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR), soluble peroxidases (sPOD) and peroxidases ionically-bound to cell wall (cwPOD) and Na + and K + concentrations. Growth was found to be more reduced in eggplant (63% reduction) than huckleberry (51% reduction). Na + concentration was 2.5-fold higher in leaf of eggplant than huckleberry. The MDA content significantly increased in root and leaf of eggplant, but remained unchanged in huckleberry. In the leaf of huckleberry, cwPOD alone was significantly enhanced by salt stress, whereas in the root all the enzymes except CAT were significantly elevated. In eggplant on the contrast, cwPOD activity tended to decrease in leaf and root, whereas CAT markedly increased in the leaf, but sharply declined in the root. APX activity in eggplant slightly increased in both root and leaf while sPOD significantly increased in the root but remained unaltered in the leaf. These results suggest that Na + exclusion in the leaf blade and greater antioxidant activity in the root constitute important adaptations to salt stress in huckleberry. Particularly, cwPOD activity in the leaf and root of huckleberry suggest a dual role in the adaptation; mainly reactive oxygen species detoxification in leaf and enhanced lignin deposition in root, which functions in controlling root-to-shoot Na + delivery.

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“…Bar = 0.5 lm in), the extent and pattern of cell wall lignification appear to be variable. Generally, abiotic stresses induce lignification (Jbir et al 2001;Schmitt et al 2006), the best known example being compression wood in conifers (Timell 1986). However, there are also reports of reduced lignification attributed to copper deficiency (Downes et al 1991) and the lignification of cell walls being abnormal apparently caused by recurring drought (Donaldson 2002).…”

Section: Discussionmentioning

confidence: 99%

“…For example, enhanced synthesis and deposition of phenolic substances at sites of fungal invasion is a general plant response against pathogenic fungi. Salt stress is known to induce peroxidase activity (Jbir et al 2001) and lignin synthesis. Ozone exposure also enhances synthesis of lignin, which may be rich in carbon-carbon bonds and in p-hydroxyphenylpropane units.…”

Section: Introductionmentioning

confidence: 99%

Cellular characteristics of a traumatic frost ring in the secondary xylem of Pinus radiata

Singh

Kim

2007

Trees

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The effect of a short-term low temperature on cellular characteristics of a frost ring in radiata pine (Pinus radiata) secondary xylem was investigated using various microscopic techniques. Cell walls in the frost ring, that formed in the earlywood due to an abrupt drop in the temperature one night in the Spring, were poorly developed, lacking in the proper thickness and the proportion of wall constituents. In majority of the cases, the cell walls were highly convoluted and the secondary walls developed poorly and incompletely. Judging by irregular deposition of lignin, it appears that the control mechanism ensuring an orderly deposition of monolignols failed to function properly. The highly porous texture of some secondary walls indicated that cellulosic and hemicellulosic framework was affected, which would explain irregular lignification of cell walls. Thus the frost ring constitutes a serious defect in the timber, being a zone of weakness along which the wood is likely to split during processing, such as drying.

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Root growth and lignification of two wheat species differing in their sensitivity to NaCl, in response to salt stress

Cited by 76 publications

References 21 publications

Water Deficits Affect Caffeate O-Methyltransferase, Lignification, and Related Enzymes in Maize Leaves. A Proteomic Investigation

Water Deficits Affect Caffeate O-Methyltransferase, Lignification, and Related Enzymes in Maize Leaves. A Proteomic Investigation

Effect of Salt Stress on Na Accumulation, Antioxidant Enzyme Activities and Activity of Cell Wall Peroxidase of Huckleberry (Solanum scabrum) and Eggplant (Solanum melongena)

Cellular characteristics of a traumatic frost ring in the secondary xylem of Pinus radiata

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