Plant Adaptive Responses to Salinity Stress

Botella, Miguel A.; Rosado, Abel; Bressan, Ray A.; Hasegawa, Paul M.

doi:10.1002/9780470988503.ch3

Cited by 58 publications

(36 citation statements)

References 202 publications

(265 reference statements)

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“…Water deficit caused by drought and high salinity has been a major selective force in plant evolution as well as a constraint to crop productivity, limiting food production (Zhu, 2002). To cope with these environmental stresses, plants respond by initiating a number of physiological and metabolic adaptive processes where abscisic acid (ABA) is a key regulatory determinant (for review, see Hasegawa et al, 2000;Chinnusamy et al, 2004;Botella et al, 2005;Riera et al, 2005;Verslues and Zhu, 2005). In addition to functioning as a mediator of stress responses, ABA regulates other processes, such as seed maturation and germination (Finkelstein et al, 2002), stomatal conductance , plant growth (Sharp and LeNoble, 2002), osmolyte accumulation (Verslues and Bray, 2006), and gene expression (Bray, 2002;Shinozaki et al, 2003).…”

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The Arabidopsis Tetratricopeptide Repeat-Containing Protein TTL1 Is Required for Osmotic Stress Responses and Abscisic Acid Sensitivity

et al. 2006

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Mutations in the Arabidopsis (Arabidopsis thaliana) TETRATRICOPEPTIDE-REPEAT THIOREDOXIN-LIKE 1 (TTL1) cause reduced tolerance to NaCl and osmotic stress that is characterized by reduced root elongation, disorganization of the root meristem, and impaired osmotic responses during germination and seedling development. Expression analyses of genes involved in abscisic acid (ABA) biosynthesis and catabolism suggest that TTL1 is not involved in the regulation of ABA levels but is required for ABA-regulated responses. TTL1 regulates the transcript levels of several dehydration-responsive genes, such as the transcription factor DREB2A, and genes encoding dehydration response proteins, such as ERD1 (early response to dehydration 1), ERD3, and COR15a. The TTL1 gene encodes a novel plant protein with tetratricopeptide repeats and a region with homology to thioredoxin proteins. Based on homology searches, there are four TTL members in the Arabidopsis genome with similar intron-exon structure and conserved amino acid domains. Proteins containing tetratricopeptide repeat motifs act as scaffold-forming multiprotein complexes and are emerging as essential elements for plant hormonal responses (such as gibberellin responses and ethylene biosynthesis). In this report, we identify TTL1 as a positive regulator of ABA signaling during germination and seedling development under stress.

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The Arabidopsis Tetratricopeptide Repeat-Containing Protein TTL1 Is Required for Osmotic Stress Responses and Abscisic Acid Sensitivity

et al. 2006

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“…Very different complementary technologies are used to optimize yield and to develop crops with increased resilience against adverse environmental growth conditions (Botella et al, 2008;Cattivelli et al, 2008;Jhaet al, 2014). Plant breeding programs are a basic component of this improvement process encompassing a wide range of technologies, such as exploration of the genetic potential by intraspecific and interspecific crosses, combination of genetic pools in hybrid breeding, mutational breeding, molecular breeding, and transgene technologies.…”

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Selection for Improved Energy Use Efficiency and Drought Tolerance in Canola Results in Distinct Transcriptome and Epigenome Changes

et al. 2015

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To increase both the yield potential and stability of crops, integrated breeding strategies are used that have mostly a direct genetic basis, but the utility of epigenetics to improve complex traits is unclear. A better understanding of the status of the epigenome and its contribution to agronomic performance would help in developing approaches to incorporate the epigenetic component of complex traits into breeding programs. Starting from isogenic canola (Brassica napus) lines, epilines were generated by selecting, repeatedly for three generations, for increased energy use efficiency and drought tolerance. These epilines had an enhanced energy use efficiency, drought tolerance, and nitrogen use efficiency. Transcriptome analysis of the epilines and a line selected for its energy use efficiency solely revealed common differentially expressed genes related to the onset of stress tolerance-regulating signaling events. Genes related to responses to salt, osmotic, abscisic acid, and drought treatments were specifically differentially expressed in the droughttolerant epilines. The status of the epigenome, scored as differential trimethylation of lysine-4 of histone 3, further supported the phenotype by targeting drought-responsive genes and facilitating the transcription of the differentially expressed genes. From these results, we conclude that the canola epigenome can be shaped by selection to increase energy use efficiency and stress tolerance. Hence, these findings warrant the further development of strategies to incorporate epigenetics into breeding.The need to improve crop yield in both quantity (yield potential) and stability (actual yield) to meet the increasing demand for food, feed, and plant-derived materials is a major challenge. Very different complementary technologies are used to optimize yield and to develop crops with increased resilience against adverse environmental growth conditions (Botella et al., 2008;Cattivelli et al., 2008; Jhaet al., 2014). Plant breeding programs are a basic component of this improvement process encompassing a wide range of technologies, such as exploration of the genetic potential by intraspecific and interspecific crosses, combination of genetic pools in hybrid breeding, mutational breeding, molecular breeding, and transgene technologies.Rather recently, epigenetics has been investigated as a potential breeding platform (Springer, 2013). Epigenetic variations or heritable changes in gene expression that are not linked to changes in the DNA sequence, but associated with differences in DNA methylation or histone modifications, provide an alternative source of phenotypic variability. A vast and growing number of studies implicate DNA methylation and histone modification in the modulation of gene expression in general, control of developmental transitions, and plant responses to biotic 1 This work was supported by the Agency for Innovation by Science and Technology (grant no. IWT100268), the Ghent University Special Research Fund (grant no. 01J11311), the European Training and...

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“…In addition, sodium and chloride ions have inhibitory effects on many enzymes and some basic cellular processes, such as RNA processing or protein synthesis (Forment et al, 2002;Niu et al, 1995;Serrano et al, 1999;Zhu et al, 1998). These two primary components of salt stress negatively affect plant survival, growth and development (Botella et al, 2005).…”

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Mitigation of Salt Stress-Induced Inhibition of Plantago crassifolia Reproductive Development by Supplemental Calcium or Magnesium

Grigore

Boscaiu

Lull

et al. 2012

Not Bot Hort Agrobot Cluj

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In Plantago crassifolia, a moderate halophyte characteristic of borders of salt marshes in the Mediterranean region, reproductive development is more sensitive to high soil salinity than vegetative growth. To investigate the possible role of calcium and magnesium salts in the responses of this species to salt stress, adult plants were submitted over a 2-month period to treatments with 300 mM NaCl-a concentration which affects, but does not completely inhibit seed formation in P. crassifolia-either alone or combined with low concentrations of CaCl 2 (10 mM) or MgCl 2 (20 mM). The NaCl treatment did not affect plant vegetative growth and had a stimulating effect on flowering. Yet almost half the spikes produced had aborted seeds, and the effect on seed number and quality-estimated by their mean weight and germination capacity-was obviously deleterious. Addition of calcium or magnesium chloride during the saltstress treatment completely counteracted the negative effect of NaCl on the 'reproductive success' of the plants: the number, weight and germination frequency of the seeds were similar to that in the control, non-stressed plants. These results indicate that both divalent cations can suppress or mitigate the deleterious effects of salt stress. While this protective role is well established in the case of calcium, we provide here the first experimental evidence of a similar function for magnesium.

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Plant Adaptive Responses to Salinity Stress

Cited by 58 publications

References 202 publications

The Arabidopsis Tetratricopeptide Repeat-Containing Protein TTL1 Is Required for Osmotic Stress Responses and Abscisic Acid Sensitivity

The Arabidopsis Tetratricopeptide Repeat-Containing Protein TTL1 Is Required for Osmotic Stress Responses and Abscisic Acid Sensitivity

Selection for Improved Energy Use Efficiency and Drought Tolerance in Canola Results in Distinct Transcriptome and Epigenome Changes

Mitigation of Salt Stress-Induced Inhibition of Plantago crassifolia Reproductive Development by Supplemental Calcium or Magnesium

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