Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Diretoria de Pesquisa Científica, Rua Pacheco Leão 915, Rio de Janeiro, CEP 22460-030, Brazil.
Protoplasma. 2020 May;257(3):863-870. doi: 10.1007/s00709-019-01472-1. Epub 2020 Jan 2.
Salt stress is harmful to plants, especially for those that live under conditions of intense salt aport. For this reason, several species present alternatives to prevent or diminish the damages that high salt concentrations may cause to the cells. Salt glands are one of these alternatives once they are specialized structures that secrete salt. Here, we aimed to investigate if the glandular trichomes in the leaves of Jacquinia armillaris are salt glands. Anatomical and ultrastructural observations showed that the glandular trichomes in J. armillaris resemble the salt glands from other recretohalophytes Primulaceae, such as, their occurrence in sunken regions in the leaf epidermis, the presence of a large basal cell that acts as a collecting cell, the detachment of the cuticle from the outer periclinal walls forming a cuticular chamber, the thickness of the cuticle in the stalk portion of the trichome, and the presence of sodium and chloride ions in the secretion and in the xylem. Altogether, the gathered results support the hypothesis that the glandular trichomes in J. armillaris are adapted to salt secretion, thus characterizing as salt glands.
盐胁迫对植物有害，特别是对那些生活在强烈盐分输出环境中的植物。出于这个原因，一些物种会产生替代物来防止或减少高盐浓度可能对细胞造成的损害。盐腺就是这些替代物之一，因为它们是分泌盐分的特化结构。在这里，我们旨在研究 Jacquinia armillaris 叶片中的腺毛是否为盐腺。解剖学和超微结构观察表明，J. armillaris 的腺毛类似于其他盐生植物报春花科的盐腺，例如，它们出现在叶片表皮的凹陷区域，存在一个大的基细胞作为收集细胞，角质层从外壁的外切向壁分离形成角质室，毛状体柄部的角质层厚度，以及分泌物和木质部中的钠离子和氯离子的存在。总的来说，收集到的结果支持了这样的假设，即 J. armillaris 的腺毛适应于盐的分泌，因此可以被认定为盐腺。
