scholarly journals Silicon: A Benefic Element to Improve Tolerance in Plants Exposed to Water Deficiency

10.5772/53765 ◽  
2013 ◽  
Author(s):  
Allan Klynger da Silva Lobato ◽  
Elaine Maria Silva Guedes ◽  
Douglas Jose ◽  
Candido Ferreira de Oliveira Neto
Keyword(s):  
Water Deficiency

Single nucleotide polymorphisms of CBF4 locus region of Arabidopsis thaliana correspond to drought tolerance

2004 ◽  
Vol 1 (3) ◽  
pp. 181-190 ◽  
Author(s):  
Hao Gang-Ping ◽  
Wu Zhong-Yi ◽  
Chen Mao-Sheng ◽  
Cao Ming-Qing ◽  
Dominique Brunel ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Drought Tolerance ◽  
World Wide ◽  
Nucleotide Variation ◽  
Nucleotide Polymorphisms ◽  
Water Deficiency ◽  
Coding Region ◽  
Nucleotide Polymorphism ◽  
Single Nucleotide ◽  
Adaptation To Drought

AbstractThe levels of drought tolerance and nucleotide polymorphism at the CBF4 locus were examined in a world-wide sample of 17 core accessions of Arabidopsis thaliana. The results showed that different accessions exhibited considerable differences in adaptation to drought stress. Compared with Columbia accession, the frequency of nucleotide polymorphism at the CBF4 locus of 25av, 203av and 244av accessions, including single nucleotide polymorphism (SNP) and insertion/deletion (Indel), was high, on average 1 SNP per 35.8 bp and 1 Indel per 143 bp. No significance in all regions of Tajima's D test indicated that the neutral mutation hypothesis could explain the nucleotide polymorphism in this CBF4 gene region. The higher polymorphism was the result of purification selection. Nucleotide polymorphism in the non-coding region was three times higher than in the coding region. This might indicate a recent relaxation of selection pressures on the non-coding region of CBF4 gene. In the coding region of CBF4, SNP frequency was 1 SNP per 96.4 bp and one non-synonymous mutation was detected from 25av, 203av and 244av accessions: the amino acid variation gly↔val at position 205, caused by the nucleotide variation G↔T at position 1034 (corresponding to the nucleotide at position 19 696 of GenBank accession no. AB015478 as 1). Furthermore, four differential SNPs were discovered in haplotype 6 constituted by 203av, one of them located in the 3′ non-coding region (A↔C at position 1106) and the others in the 5′ non-coding region (A↔G, A↔C and G↔A at positions 27, 129 and 171, respectively). The drought tolerance assay indicated that accession 203av was the best at tolerating water deficiency. We propose that haplotype 6 is consistent with its drought tolerance.

scholarly journals Mineral nutrition of mycorrhized tropical gum tree A. senegal (L.) under water deficiency conditions

2013 ◽  
Vol 8 (17) ◽  
pp. 1743-1747
Author(s):  
Malick Ndiaye ◽  
Eric Cavalli ◽  
El Hadji Malick Leye ◽  
Tahir Abdoulaye Diop
Keyword(s):  
Mineral Nutrition ◽  
Water Deficiency

scholarly journals Photosynthetic pigments and carbohydrates in young Brazil nut (Bertholletia excelsa H.B.K.) plants exposed to moderate and severe water deficiency

2016 ◽  
Vol 10 (07) ◽  
pp. 920-925 ◽  
Author(s):  
Paula Francyneth Nascimento Silva ◽  
◽  
Carla Leticia Figueredo de Carvalho Souza ◽  
Jose Rodrigo Mendes e Chagas ◽  
Gabriel Mascarenhas Maciel ◽  
...  
Keyword(s):  
Photosynthetic Pigments ◽  
Water Deficiency ◽  
Brazil Nut ◽  
Bertholletia Excelsa

Egypt Faces Water Deficiency, and Food Insufficiency

2020 ◽  
pp. 29-58
Author(s):  
Abd El-Hafeez Zohry ◽  
Samiha Ouda
Keyword(s):  
Water Deficiency ◽  
Food Insufficiency

scholarly journals Drought Adaptation in Fuchsia magellanica and Its Effect on Freezing Tolerance

2008 ◽  
Vol 133 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Majken Pagter ◽  
Karen K. Petersen ◽  
Fulai Liu ◽  
Christian R. Jensen
Keyword(s):  
Water Potential ◽  
Water Deficit ◽  
Freezing Tolerance ◽  
Woody Plants ◽  
Xylem Sap ◽  
Water Deficiency ◽  
Frost Injury ◽  
Different Types ◽  
Curvilinear Relation ◽  
Reduced Water

Fuchsia (Fuchsia L.) is a popular woody ornamental, but it is very susceptible to frost injury during winter. As drought stress may be used to enhance freezing tolerance in woody plants, the effects of different types of water deficit on growth, selected physiological traits, and freezing tolerance were examined in Fuchsia magellanica Lam. ‘Riccartonii’. Drought responses were investigated after 6 weeks of pretreatment, where individual plants grown in a greenhouse under conditions of unrestricted water supply were compared with plants subjected to cyclic or continuous water deficit. After an additional 4 weeks of treatment at short day (10 h) and low temperature (8 °C day/4 °C night), freezing tolerance was examined. Both continuous and cyclic water deficit plants reduced water loss by reducing aboveground biomass and by efficient stomatal regulation. Continuous water deficit plants tended to adjust osmotically, while cyclic water deficit induced significantly higher xylem sap abscisic acid [(ABA)xylem] and leaf proline concentrations and a lower leaf water potential (ψl) than continuous water deficit, indicating that F. magellanica responds differently to continuous water deficit and to fast drying associated with stress phases of cyclic water deficit. The root water potential (ψr) and (ABA)xylem were negatively linearly correlated, implying that increasing water deficiency stimulated formation of ABA in the roots. An inverse, curvilinear relation between (ABA)xylem and stomatal conductance (g s) indicated that root-originated ABA might control g s during mild water deficits. Neither cold-acclimating conditions alone nor combined with water deficit increased stem freezing tolerance, indicating that F. magellanica lacks cold-acclimation ability under the inductive conditions used in this study.

scholarly journals Gibberellin in tomato: metabolism, signaling and role in drought responses

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Hagai Shohat ◽  
Natanella Illouz Eliaz ◽  
David Weiss
Keyword(s):  
Tomato Plant ◽  
Plant Response ◽  
Water Deficiency ◽  
Drought Avoidance ◽  
Drought Tolerant ◽  
Improved Performance ◽  
Plant Life Cycle ◽  
Response To Water ◽  
Signaling Components

AbstractThe growth-promoting hormone gibberellin (GA) regulates numerous developmental processes throughout the plant life cycle. It also affects plant response to biotic and abiotic stresses. GA metabolism and signaling in tomato (Solanum lycopersicum) have been studied in the last three decades and major components of the pathways were characterized. These include major biosynthesis and catabolism enzymes and signaling components, such as the three GA receptors GIBBERELLIN INSENSITIVE DWARF 1 (GID1) and DELLA protein PROCERA (PRO), the central response suppressor. The role of these components in tomato plant development and response to the environment have been investigated. Cultivated tomato, similar to many other crop plants, are susceptible to water deficiency. Numerous studies on tomato response to drought have been conducted, including the possible role of GA in tomato drought resistance. Most studies showed that reduced levels or activity of GA improves drought tolerance and drought avoidance. This review aims to provide an overview on GA biosynthesis and signaling in tomato, how drought affects these pathways and how changes in GA activity affect tomato plant response to water deficiency. It also presents the potential of using the GA pathway to generate drought-tolerant tomato plants with improved performance under both irrigation and water-limited conditions.

scholarly journals Endoproteinase activities in wheat leaves upon water deficit.

1996 ◽  
Vol 43 (3) ◽  
pp. 515-519 ◽  
Author(s):  
B Zagdańska ◽  
K Wiśniewski
Keyword(s):  
Water Deficit ◽  
Cysteine Proteinase ◽  
Ph Dependence ◽  
Serine Proteinase ◽  
Aspartic Proteinase ◽  
Water Deficiency ◽  
Drought Conditions ◽  
Wheat Leaves

In wheat leaves acclimated and non-acclimated to water deficit the azocaseinolytic activities of endoproteinases were increased about 7-fold under drought conditions. Under such conditions both the pH dependence profile and the endoproteinase pattern were also changed. The predominant contribution of serine proteinase (about 50% of total endoproteinase activity) remains unaltered in the drought stressed leaves. Cysteine proteinase was induced to the same extent in the drought-stressed leaves irrespective of the acclimation pretreatment, while the contribution of aspartic proteinase was reduced upon water deficit but in the acclimated stressed leaves was as high as in the non-stressed leaves. These changes in the pattern of endoproteinases seem to imply that the water deficiency affects endogenous proteolysis.

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