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  1. Article ; Online: Role of acemannan and pectic polysaccharides in saline-water stress tolerance of Aloe vera (Aloe barbadensis Miller) plant.

    Comas-Serra, Francesca / Miró, José Luis / Umaña, Mónica M / Minjares-Fuentes, Rafael / Femenia, Antoni / Mota-Ituarte, María / Pedroza-Sandoval, Aurelio

    International journal of biological macromolecules

    2024  Volume 268, Issue Pt 1, Page(s) 131601

    Abstract: This study investigates the impact of water and salinity stress on Aloe vera, focusing on the role of Aloe vera polysaccharides in mitigating these stresses. Pectins and acemannan were the most affected polymers. Low soil moisture and high salinity (NaCl ...

    Abstract This study investigates the impact of water and salinity stress on Aloe vera, focusing on the role of Aloe vera polysaccharides in mitigating these stresses. Pectins and acemannan were the most affected polymers. Low soil moisture and high salinity (NaCl 80 mM) increased pectic substances, altering rhamnogalacturonan type I in Aloe vera gel. Aloe vera pectins maintained a consistent 60 % methyl-esterification regardless of conditions. Interestingly, acemannan content rose with salinity, particularly under low moisture, accompanied by 90 to 150 % acetylation increase. These changes improved the functionality of Aloe vera polysaccharides: pectins increased cell wall reinforcement and interactions, while highly acetylated acemannan retained water for sustained plant functions. This study highlights the crucial role of Aloe vera polysaccharides in enhancing plant resilience to water and salinity stress, leading to improved functional properties.
    Language English
    Publishing date 2024-04-16
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2024.131601
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Joint water and salinity stresses increase the bioactive compounds of Aloe vera (Aloe barbadensis Miller) gel enhancing its related functional properties

    González-Delgado, Mayra / Minjares-Fuentes, Rafael / Mota-Ituarte, María / Pedroza Sandoval, Aurelio / Comas-Serra, Francesca / Quezada Rivera, Jesús Josafath / Sáenz-Esqueda, Ángeles / Femenia, Antoni

    Agricultural Water Management. 2023 July, v. 285 p.108374-

    2023  

    Abstract: The Aloe vera plant is an important source of bioactive compounds. Its growing conditions may have a considerable effect on both its physiological and chemical characteristics. Thus, the objective of this study was to evaluate the effect of joint water ... ...

    Abstract The Aloe vera plant is an important source of bioactive compounds. Its growing conditions may have a considerable effect on both its physiological and chemical characteristics. Thus, the objective of this study was to evaluate the effect of joint water and salinity stresses (water + salinity) on the main bioactive compounds of the Aloe vera gel, the colorless inner parenchymatous tissue (also known as inner leaf juice), and their related functional properties. Aloe vera plants were treated with two levels of available soil moisture (high and low) and five levels of salinity (0, 20, 40, 60 and 80 mM NaCl). Plants grown at high available soil moisture without salt concentration were taken as a control (HASM-0). Total phenolic compounds, aloin, cell wall polysaccharides and water-soluble polymers were the bioactive compounds analyzed along with the antioxidant activity, radical scavenging, swelling, water retention and fat adsorption capacities. In general, the water + salinity stress negatively affected the development and growing process of the plants. However, it did cause a considerable increase in the total amount of dry matter, from 1.0 to 2.1 g/100 g of fresh Aloe vera gel. This increase was mainly due to the synthesis of new polysaccharides, and in particular of water-soluble mannose-rich polymers composed of mannose, galactose and glucose which increased from 194.4 to 345.8 mg/g of water-soluble material as water + salinity stress increased. Further, there was a significant increase in the aloin content, from 10.7 to 19.6 mg/g of total solid contents from Aloe vera gel. These changes in the bioactive compounds were reflected in the functional properties studied. Hydration properties of Aloe vera gel, such as swelling and water retention capacity, exhibited higher values for those plants treated with water deficit and salinity. The antioxidant capacity, determined by FRAP and DPPH methods, was also higher in the gel from stressed plants. Overall, these results show that water + salinity stress could be an agricultural strategy for increasing not only the content of bioactive compounds present in the Aloe vera gel but also for improving their related functional properties.
    Keywords Aloe vera ; adsorption ; antioxidant activity ; cell walls ; galactose ; gels ; glucose ; juices ; leaves ; mannose ; polysaccharides ; salinity ; salt concentration ; salt stress ; soil water ; water holding capacity ; water management ; water solubility ; Aloin ; Functional properties ; Water and salinity stresses
    Language English
    Dates of publication 2023-07
    Publishing place Elsevier B.V.
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 751144-9
    ISSN 1873-2283 ; 0378-3774
    ISSN (online) 1873-2283
    ISSN 0378-3774
    DOI 10.1016/j.agwat.2023.108374
    Database NAL-Catalogue (AGRICOLA)

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