title: Mineral content and biochemical variables of Aloe vera L. under salt stress.
abstract: Despite the proven economic importance of Aloe vera, studies of saline stress and its effects on the biochemistry and mineral content in tissues of this plant are scarce. The objective of this study was to grow Aloe under NaCl stress of 0, 30, 60, 90 and 120 mM and compare: (1) proline, total protein, and enzyme phosphoenolpyruvate carboxylase (PEP-case) in chlorenchyma and parenchyma tissues, and (2) ion content (Na, K, Ca, Mg, Cl, Fe, P. N, Zn, B, Mn, and Cu) in roots, stems, leaves and sprouts. Proline and PEP-case increased as salinity increased in both parenchyma and chlorenchyma, while total protein increased in parenchyma and decreased in chlorenchyma, although at similar salt concentrations total protein was always higher in chlorenchyma. As salinity increased Na and Cl ions increased in roots, stems, leaves, while K decreased only significantly in sprouts. Salinity increases typically caused mineral content in tissue to decrease, or not change significantly. In roots, as salinity increased Mg decreased, while all other minerals failed to show a specific trend. In stems, the mineral concentrations that changed were Fe and P which increased with salinity while Cu decreased. In leaves, Mg, Mn, N, and B decreased with salinity, while Cu increased. In sprouts, the minerals that decreased with increasing salinity were Mg, Mn, and Cu. Zinc did not exhibit a trend in any of the tissues. The increase in protein, proline and PEP-case activity, as well as the absorption and accumulation of cations under moderate NaCl stress caused osmotic adjustment which kept the plant healthy. These results suggest that Aloe may be a viable crop for soil irrigated with hard water or affected by salinity at least at concentrations used in the present study.
authors.affiliation: Centro de Investigaciones Biológicas del Noroeste, S.C. La Paz, Baja California Sur, México.
authors.forename: Bernardo
authors.initials: B
authors.lastname: Murillo-Amador
authors.affiliation: Centro de Investigaciones Biológicas del Noroeste, S.C. La Paz, Baja California Sur, México.
authors.forename: Miguel Víctor
authors.initials: MV
authors.lastname: Córdoba-Matson
authors.affiliation: Universidad Autónoma de Baja California Sur, La Paz, Baja California Sur, México.
authors.forename: Jorge Arnoldo
authors.initials: JA
authors.lastname: Villegas-Espinoza
authors.affiliation: Centro de Investigaciones Biológicas del Noroeste, S.C. La Paz, Baja California Sur, México.
authors.forename: Luis Guillermo
authors.initials: LG
authors.lastname: Hernández-Montiel
authors.affiliation: Centro de Investigaciones Biológicas del Noroeste, S.C. La Paz, Baja California Sur, México.
authors.forename: Enrique
authors.initials: E
authors.lastname: Troyo-Diéguez
authors.affiliation: Universidad Juárez del Estado de Durango, Durango, Durango, México.
authors.forename: José Luis
authors.initials: JL
authors.lastname: García-Hernández
mesh_terms: D000504:Aloe / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D008903:Minerals / Q000378:metabolism*; D010730:Phosphoenolpyruvate Carboxylase / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D011392:Proline / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology*; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D008903:Minerals; D010940:Plant Proteins; D012965:Sodium Chloride; D011392:Proline; D010730:Phosphoenolpyruvate Carboxylase
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