EMILIANE DOS SANTOS BELO
Abstract:
Plants responses to deficit are complex, involving adaptive changes and/or deleterious effects. Damage caused by stress to plants can be reversible or irreversible. Aimed to evaluate the tolerance of gabirobeira (Campomanesia spp) to water stress and root hypoxia for 18 days. Fresh, dry matter, water, AST, sucrose, starch, crude, insoluble, soluble protein and amino acids of leaves and roots were evaluated, as well as growth parameters such as TCR, TCA, TAL, neck diameter, length and root area. Water-stressed gabirobe trees have reduced water content, reduced leaf and root biomass production, reduced AST, starch and amino acid content. Under hypoxia, they exhibited damage in the allocation of photoassimilates from the shoot to the roots, and therefore stored large amounts of starch, the largest damage occurred in roots. Water stress survival strategies include the remobilization of soluble carbohydrates and reserve shoots from the roots to the roots, allowing the gabirobe trees to escape drought. Under hypoxia the water potential of the leaves was sustained with soluble carbohydrates from starch remobilization, probably there was also synthesis and degradation of polypeptides and enzyme in roots due to the change from aerobic to anaerobic metabolism.
