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Anatomical and ultrastructural studies reveal temporal and spatial variation in the oil production in leaves of the diesel tree (Copaifera langsdorffii, Leguminosae)
Protoplasma ( IF 2.9 ) Pub Date : 2020-06-09 , DOI: 10.1007/s00709-020-01519-8
Plácido Fabrício Silva Melo Buarque 1, 2 , Silvia Rodrigues Machado 3 , Tatiane Maria Rodrigues 3
Affiliation  

The oily resin produced by Copaifera langsdorffii, commonly called oil of copaiba, is widely exploited by the drug, cosmetic, and biodiesel industries. The distribution of oily secretory cavities and canals (secretory spaces) over the vegetative body characterizes this species. Oil is stored inside the lumen of the secretory spaces and only reaches the organ surface after injuries. Nonetheless, translucent oily deposits occur on the adaxial surface of intact young leaves. In this study, we searched for further sources of oil production in C. langsdorffii leaves in addition to the well-known secretory cavities and investigated the mechanisms of secretion. Leaves in different developmental stages were collected from adult plants and processed for studies on light and transmission electron microscopies. The primary finding of this study was the involvement of the chlorenchyma cells in lipid biosynthesis, in addition to the secretory cavities. The secretory activity of cavities and chlorenchyma cells overlapped in young leaves. Ultrastructurally, secretory cavity cells exhibited abundant smooth endoplasmic reticulum profiles and oleoplasts, whereas the chlorenchyma cells had large chloroplasts with oil inclusions. Our data suggest that the oily material on the leaf surface arose from the chlorenchyma and was transported via the apoplast. These findings open new avenues for understanding oil biosynthesis regulation in mesophyll cells and planning of future strategies for the biotechnological application of C. langsdorffii leaves.

中文翻译:

解剖学和超微结构研究揭示了柴油树(Copaifera langsdorffii,豆科)叶子中产油量的时间和空间变化

Copaifera langsdorffii 生产的油性树脂,俗称copaiba 油,被制药、化妆品和生物柴油行业广泛利用。油性分泌腔和运河(分泌空间)在营养体上的分布是该物种的特征。油储存在分泌空间的腔内,只有在受伤后才能到达器官表面。尽管如此,半透明的油性沉积物出现在完整幼叶的正面。在这项研究中,除了众所周知的分泌腔外,我们还在 C. langsdorffii 叶子中寻找了更多的产油来源,并研究了分泌机制。从成年植物中收集不同发育阶段的叶子,并对其进行处理,用于光和透射电子显微镜的研究。这项研究的主要发现是除了分泌腔外,绿藻细胞还参与脂质生物合成。空腔和绿藻细胞的分泌活动在幼叶中重叠。在超微结构上,分泌腔细胞表现出丰富的光滑内质网轮廓和油质体,而绿藻细胞具有含有油包裹体的大叶绿体。我们的数据表明叶表面的油性物质来自绿藻并通过质外体运输。这些发现为了解叶肉细胞中油的生物合成调节和规划 C. langsdorffii 叶子的生物技术应用的未来策略开辟了新的途径。空腔和绿藻细胞的分泌活动在幼叶中重叠。在超微结构上,分泌腔细胞表现出丰富的光滑内质网轮廓和油质体,而绿藻细胞具有含有油包裹体的大叶绿体。我们的数据表明叶表面的油性物质来自绿藻并通过质外体运输。这些发现为了解叶肉细胞中油的生物合成调节和规划 C. langsdorffii 叶子的生物技术应用的未来策略开辟了新的途径。空腔和绿藻细胞的分泌活动在幼叶中重叠。在超微结构上,分泌腔细胞表现出丰富的光滑内质网轮廓和油质体,而绿藻细胞具有含有油包裹体的大叶绿体。我们的数据表明叶表面的油性物质来自绿藻并通过质外体运输。这些发现为了解叶肉细胞中油的生物合成调节和规划 C. langsdorffii 叶子的生物技术应用的未来策略开辟了新的途径。我们的数据表明叶表面的油性物质来自绿藻并通过质外体运输。这些发现为了解叶肉细胞中油的生物合成调节和规划 C. langsdorffii 叶子的生物技术应用的未来策略开辟了新的途径。我们的数据表明叶表面的油性物质来自绿藻并通过质外体运输。这些发现为了解叶肉细胞中油的生物合成调节和规划 C. langsdorffii 叶子的生物技术应用的未来策略开辟了新的途径。
更新日期:2020-06-09
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