Peña-Rojas Karen, Donoso Sergio, Badaracco Carolain, Naulin Paulette I, Gotor Bárbara, Riquelme Alejandro
Mediterranean Forests Laboratory, Faculty of Forestry and Nature Conservation, Chile University, Avenida Santa Rosa 11315, La Pintana 8820808, Santiago, Chile.
Plant Biology Laboratory, Faculty of Forestry and Nature Conservation, Chile University, Avenida Santa Rosa 11315, La Pintana 8820808, Santiago, Chile.
Plants (Basel). 2024 Oct 8;13(19):2812. doi: 10.3390/plants13192812.
Quillay ( Molina) and peumo ( [Molina] Looser) are two tree species endemic to Chile that grow in Mediterranean climate zones, characterized by a summer season with high temperatures, high solar radiation, and low soil water availability. A study was conducted with 2-year-old and plants and two substrate water conditions: well-watered and controlled water restriction. At the end of the study, anatomical leaf modifications were analyzed. The tissues were anatomically described in transverse sections of juvenile and adult leaves, measuring leaf thickness, cuticle thickness, and cell density of the mesophyll parenchymal tissues. In the young leaves of plants undergoing water restriction treatment, an increase in cuticle and leaf thickness and a decrease in the density of the palisade and spongy parenchyma were observed. In contrast, a significant reduction in leaf thickness was observed in adult leaves of both species with water restriction treatment. The anatomical changes in the leaves of and suggest an adaptation to adverse environmental conditions, such as water restriction.
皂树（智利刺木）和泡桐（[莫利纳]洛瑟）是智利特有的两种树种，生长在地中海气候区，其特点是夏季气温高、太阳辐射强且土壤水分供应少。对2年生的皂树和泡桐植株以及两种基质水分条件进行了研究：充分浇水和控制水分限制。在研究结束时，分析了叶片的解剖结构变化。在幼叶和成熟叶的横切面上对组织进行了解剖描述，测量了叶片厚度、角质层厚度以及叶肉薄壁组织的细胞密度。在接受水分限制处理的皂树幼叶中，观察到角质层和叶片厚度增加，栅栏薄壁组织和海绵薄壁组织密度降低。相比之下，在接受水分限制处理的两个树种的成熟叶中，叶片厚度均显著降低。皂树和泡桐叶片的解剖结构变化表明它们对诸如水分限制等不利环境条件具有适应性。
