Changes in crassulacean acid metabolism expression, chloroplast ultrastructure, photochemical and antioxidant activity in the Aloe vera during acclimation to combined drought and salt stress

2021 ◽  
Author(s):  
Ghader Habibi
Keyword(s):  
Antioxidant Activity ◽  
Salt Stress ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Aloe Vera ◽  
Chloroplast Ultrastructure ◽  
Drought And Salt Stress

Carbon isotope composition and water-use efficiency in plants with crassulacean acid metabolism

2005 ◽  
Vol 32 (5) ◽  
pp. 381 ◽  
Author(s):  
Klaus Winter ◽  
Jorge Aranda ◽  
Joseph A. M. Holtum
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Aloe Vera ◽  
Dry Mass ◽  
Tropical Conditions ◽  
Δ13c Value ◽  
Use Efficiency ◽  
Cam Species

The relationship between water-use efficiency, measured as the transpiration ratio (g H2O transpired g–1 above- plus below-ground dry mass accumulated), and 13C / 12C ratio (expressed as δ13C value) of bulk biomass carbon was compared in 15 plant species growing under tropical conditions at two field sites in the Republic of Panama. The species included five constitutive crassulacean acid metabolism (CAM) species [Aloe vera (L.) Webb & Berth., Ananas comosus (L.) Merr., Euphorbia tirucalli L., Kalanchoë daigremontiana Hamet et Perr., Kalanchoë pinnata (Lam.) Pers.], two species of tropical C3 trees (Tectona grandis Linn. f. and Swietenia macrophylla King), one C4 species (Zea mays L.), and seven arborescent species of the neotropical genus Clusia, of which two exhibited pronounced CAM. The transpiration ratios of the C3 and CAM species, which ranged between 496 g H2O g–1 dry mass in the C3–CAM species Clusia pratensis Seeman to 54 g H2O g–1 dry mass in the constitutive CAM species Aloe vera, correlated strongly with δ13C values and nocturnal CO2 gain suggesting that δ13C value can be used to estimate both water-use efficiency and the proportion of CO2 gained by CAM species during the light and the dark integrated over the lifetime of the tissues.

scholarly journals Developmental Control of Crassulacean Acid Metabolism Inducibility by Salt Stress in the Common Ice Plant

1990 ◽  
Vol 94 (3) ◽  
pp. 1137-1142 ◽  
Author(s):  
John C. Cushman ◽  
Christine B. Michalowski ◽  
Hans J. Bohnert
Keyword(s):  
Salt Stress ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Ice Plant ◽  
Developmental Control ◽  
The Common

scholarly journals Malate Accumulation in Different Organs of Mesembryanthemum crystallinum L. Following Age-dependent or Salinity-triggered CAM Metabolism

2004 ◽  
Vol 59 (3-4) ◽  
pp. 223-228 ◽  
Author(s):  
Marta Libik ◽  
Beata Pater ◽  
Stewart Elliot ◽  
Ireneusz Ślesak ◽  
Zbigniew Miszalski
Keyword(s):  
Salt Stress ◽  
Catalase Activity ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Mesembryanthemum Crystallinum ◽  
Mature Leaves ◽  
Cam Metabolism ◽  
Age Dependent ◽  
Young Leaves ◽  
High Concentrations

Different organs of Mesembryanthemum crystallinum exhibit differing levels of CAM (Crassulacean acid metabolism), identifiable by quantification of nocturnal malate accumulation. Shoots and also basal parts of young leaves were observed to accumulate high concentrations of malate. It was typically found in mature leaves and especially prominent in plants subjected to salt stress. Small amount of nocturnal malate accumulation was found in roots of M. crystallinum plants following age-dependent or salinity-triggered CAM. This is an indication that malate can be also stored in non-photosynthetic tissue. Measurements of catalase activity did not produce evidence of the correlation between activity of this enzyme and the level of malate accumulation in different organs of M. crystallinum although catalase activity also appeared to be dependent on the photoperiod. In all material collected at dusk catalase activity was greater than it was observed in the organs harvested at dawn.

scholarly journals Expression of a glucomannan mannosyltransferase gene (GMMT) from Aloe vera is induced by water deficit and abscisic acid

2018 ◽  
Author(s):  
Pamela Salinas ◽  
Carlos Salinas ◽  
Rodrigo A. Contreras ◽  
Gustavo E. Zuñiga ◽  
Paul Dupree ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Gel Electrophoresis ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Plant Stress ◽  
Aloe Vera ◽  
Stress Hormone ◽  
Aloe Barbadensis ◽  
Exogenous Aba

HighlightGMMT (a possible CSLA9) from Aloe vera is upregulated during water stress. Aloe vera GMMT expression is also induced by exogenous application of the plant stress hormone abscisic acid (ABA) in non-water-stressed plants.SummaryIn Aloe barbadensis Miller (Aloe vera), a xerophytic crassulacean acid metabolism (CAM) plant, the main polysaccharide of the gel present in the leaves is an acetylated glucomannan named acemannan. This polysaccharide is responsible for the plant succulence, helping it to retain water. In this study we determined using polysaccharide analysis by carbohydrate gel electrophoresis (PACE) that the acemannan is a glucomannan without galactose side branches. We also investigated the expression of the gene responsible for acemannan backbone synthesis, encoding a glucomannan mannosyltransferase (GMMT). It was found by in silico analyses that the GMMT gene belongs to the cellulose synthase like A type-9 (CSLA9) subfamily. Using RT-qPCR it was found that the expression of GMMT increased in Aloe vera plants subjected to water stress. This expression correlates with an increase of endogenous ABA levels, suggesting that the gene expression could be regulated by ABA. To corroborate this hypothesis, exogenous ABA was applied to non-water-stressed plants, increasing the expression of GMMT significantly 48 h after ABA treatment.

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