Eucalyptus spp. and Populus spp. coping with salinity stress: an approach on growth, physiological and molecular features in the context of short rotation coppice (SRC)

Sixto, Hortensia; González-González, Borja D.; Molina-Rueda, Juan Jesús; Garrido-Aranda, Alicia; Sanchez, Manuel Mario; López, Gustavo; Gallardo, Fernando; Cañellas, Isabel; Mounet, Fabien; Grima‐Pettenati, Jacqueline; Cantón, Francisco R.

doi:10.1007/s00468-016-1420-7

Cited by 20 publications

(8 citation statements)

References 66 publications

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“…Recent transcriptome comparisons of salt treated and non-stressed eucalypt trees uncovered responses of a large number of transcription factors (TFs) including members of the MYB TF family [129] to salt. Upregulation genes encoding transcription factors (EgrMYB20, EgrMYB47 and EgrMYB36) involved as master switches in secondary xylem development were observed in several eucalyptus genotypes tested, in particular under the higher (125 mM) salt treatment [130]. BplMYB46, a MYB gene from Betula platyphylla (birch), has also been reported to be involved in both abiotic stress tolerance and secondary wall biosynthesis [131].…”

Section: Salt Severely Affects Wood Formationmentioning

confidence: 99%

What Makes the Wood? Exploring the Molecular Mechanisms of Xylem Acclimation in Hardwoods to an Ever-Changing Environment

Eckert

Sharmin

Kogel

et al. 2019

Forests

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Wood, also designated as secondary xylem, is the major structure that gives trees and other woody plants stability for upright growth and maintains the water supply from the roots to all other plant tissues. Over recent decades, our understanding of the cellular processes of wood formation (xylogenesis) has substantially increased. Plants as sessile organisms face a multitude of abiotic stresses, e.g., heat, drought, salinity and limiting nutrient availability that require them to adjust their wood structure to maintain stability and water conductivity. Because of global climate change, more drastic and sudden changes in temperature and longer periods without precipitation are expected to impact tree productivity in the near future. Thus, it is essential to understand the process of wood formation in trees under stress. Many traits, such as vessel frequency and size, fiber thickness and density change in response to different environmental stimuli. Here, we provide an overview of our current understanding of how abiotic stress factors affect wood formation on the molecular level focussing on the genes that have been identified in these processes.

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Section: Salt Severely Affects Wood Formationmentioning

confidence: 99%

What Makes the Wood? Exploring the Molecular Mechanisms of Xylem Acclimation in Hardwoods to an Ever-Changing Environment

Eckert

Sharmin

Kogel

et al. 2019

Forests

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“…Reductions in gas exchange, caused by salt stress, contributed to reduction in biomass production, which can be confirmed by the correlations of gs, A and A/Ci with the TDM, in the largest salt concentrations. Indeed, biomass production is reduced as a consequence of less CO 2 assimilation, as has been verified also in Eucalyptus plants (Sixto et al 2016) and in Jatropha curcas L. (Cavalcante et al 2018) under salt stress.…”

Section: Discussionmentioning

confidence: 52%

“…This condition probably indicates the possible acclimatization of I144 to salt stress, since there were more pronounced reductions of gs, E and A, in the other clones, notably in I224, suggesting that this clone is more sensitive to salt stress. Bhargava et al (2014) and Sixto et al (2016), in working with Eucalyptus under salt stress, observed that the salinity promoted the reduction of gas exchange in plants. In a similar way, studies done with Anacardium occidental (Bezerra et al, 2003), Ricinus communis L. (Pinheiro et al, 2008), and Jatropha curcas L. (Cavalcante et al, 2018) cultivated in saline soil have also confirmed that gas exchanges are negatively affected by salinity, as observed among Eucalyptus clones.…”

Section: Discussionmentioning

confidence: 99%

“…In different Eucalyptus genotypes cultivated in saline solutions presenting an electrical conductivity (EC) of 7 dS m -1 to 14 dS m -1 , decrease in photosynthesis, stomatal conductance, and biomass production were found (Sixto et al 2016), while higher salt concentrations (EC 20 dS m -1 to 40 dS m -1 ) were lethal to the plants (Bhargava et al, 2014). Other studies involving different species such as Ricinus communis L. (Pinheiro et al, 2008) and Jatropha curcas L. (Cavalcante et al, 2018) also found reductions due to salinity of stomatal conductance, photosynthesis, photosynthetic pigments, maximum photochemical efficiency of photosystem II, and total dry matter.…”

Section: Introductionmentioning

confidence: 99%

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Photosynthetic performance in Eucalyptus clones cultivated in saline soil

et al. 2019

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The aim of this study was to evaluate the photosynthetic performance of Eucalyptus clones with the aim of identifying their tolerance to soil saline stress conditions. The experiment was arranged in a randomized block design with a 3 × 4 factorial arrangement: in five replications, totaling 60 plots, three Eucalyptus clones were used, VC865, I224, and I144, which were exposed to four concentrations of NaCl (0, 1, 2 and 3 g NaCl kg-1 of soil). Clone I144 shows mechanisms of salinity tolerance as smaller reductions in the stomatal conductance, transpiration, photosynthesis, photochemical efficiency of PSII, photosynthetic pigment content and total dry mass. On the other hand, clone I224 presents greater physiological damage, indicating high susceptibility to salt stress, while VC865 shows moderate sensitivity to salinity. Variables related to photosynthetic performance, such as gas exchange, photochemical efficiency of PSII and photosynthetic pigments are potentially reliable physiological indicators for selecting of tolerant Eucalyptus clones to salt stress.

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“…After amplification, a dissociation step was performed to confirm the presence of a simple amplicon. Transcript abundance was calculated using the 2 −ΔΔCt method, with the geometric mean of five validated housekeeping genes to normalize the results [ Ubiquitin ( UBQ ), CDC2 (Legay et al, 2010 ), HK1, HK3 , and HK11 (Sixto et al, 2016 )]. Control samples were used to standardize the results.…”

Section: Methodsmentioning

confidence: 99%

The Woody-Preferential Gene EgMYB88 Regulates the Biosynthesis of Phenylpropanoid-Derived Compounds in Wood

et al. 2016

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Comparative phylogenetic analyses of the R2R3-MYB transcription factor family revealed that five subgroups were preferentially found in woody species and were totally absent from Brassicaceae and monocots (Soler et al., 2015). Here, we analyzed one of these subgroups (WPS-I) for which no gene had been yet characterized. Most Eucalyptus members of WPS-I are preferentially expressed in the vascular cambium, the secondary meristem responsible for tree radial growth. We focused on EgMYB88, which is the most specifically and highly expressed in vascular tissues, and showed that it behaves as a transcriptional activator in yeast. Then, we functionally characterized EgMYB88 in both transgenic Arabidopsis and poplar plants overexpressing either the native or the dominant repression form (fused to the Ethylene-responsive element binding factor-associated Amphiphilic Repression motif, EAR). The transgenic Arabidopsis lines had no phenotype whereas the poplar lines overexpressing EgMYB88 exhibited a substantial increase in the levels of the flavonoid catechin and of some salicinoid phenolic glycosides (salicortin, salireposide, and tremulacin), in agreement with the increase of the transcript levels of landmark biosynthetic genes. A change in the lignin structure (increase in the syringyl vs. guaiacyl, S/G ratio) was also observed. Poplar lines overexpressing the EgMYB88 dominant repression form did not show a strict opposite phenotype. The level of catechin was reduced, but the levels of the salicinoid phenolic glycosides and the S/G ratio remained unchanged. In addition, they showed a reduction in soluble oligolignols containing sinapyl p-hydroxybenzoate accompanied by a mild reduction of the insoluble lignin content. Altogether, these results suggest that EgMYB88, and more largely members of the WPS-I group, could control in cambium and in the first layers of differentiating xylem the biosynthesis of some phenylpropanoid-derived secondary metabolites including lignin.

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Eucalyptus spp. and Populus spp. coping with salinity stress: an approach on growth, physiological and molecular features in the context of short rotation coppice (SRC)

Cited by 20 publications

References 66 publications

What Makes the Wood? Exploring the Molecular Mechanisms of Xylem Acclimation in Hardwoods to an Ever-Changing Environment

What Makes the Wood? Exploring the Molecular Mechanisms of Xylem Acclimation in Hardwoods to an Ever-Changing Environment

Photosynthetic performance in Eucalyptus clones cultivated in saline soil

The Woody-Preferential Gene EgMYB88 Regulates the Biosynthesis of Phenylpropanoid-Derived Compounds in Wood

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