Anatomical modifications of Butia capitata propagated under colored shade nets

Abstract The jelly palm plant [Butia capitata (Martius) Beccari] is a native palm of the Cerrado biome used for many purposes in northern Minas Gerais State, Brazil. Dormancy is common in palm seeds, resulting in slow and uneven germination that may take years to complete. Modification in the growth pattern, anatomical parameters, physiological and biochemical characteristics of the plant can be verified due to changes in the light spectrum transmitted through colored shade nets used. Therefore, the objective of this study is to evaluate the effect of colored shade nets on the leaf and root anatomy of the jelly palm plant. The experiment was performed in a completely randomized design, with five treatments, ten replicates and eight plants per replicate, totaling 400 plants. Four colored photo-converter nets with 50% shading and different radiation proportions were employed: white (985 μmol.m-2.s-1), red (327 μmol.m-2.s-1), black (433 μmol.m-2.s-1) and silver (405 μmol.m-2.s-1). The plants cultivated under direct sunlight (1000 μmol.m-2.s-1) were considered as the control group. Leaf and root anatomical analysis was performed on 10 plants per treatment. It is possible to conclude that the colored shade nets caused changes in leaf and root anatomy of the jelly palm plant (Butia capitata).

摘要 果冻棕榈（Butia capitata (Martius) Beccari）是巴西塞拉多生物群系的本土棕榈物种，在米纳斯吉拉斯州北部被广泛应用于多种用途。棕榈种子普遍存在休眠现象，导致萌发进程缓慢且不齐，完整萌发周期可长达数年。通过有色遮阳网过滤得到的光谱变化，可用于验证植株生长模式、解剖参数、生理及生化特性的改变。因此，本研究旨在探究有色遮阳网对果冻棕榈叶片与根系解剖结构的影响。本实验采用完全随机设计，设置5个处理组，每组设10次重复，每次重复种植8株植株，总计400株供试材料。实验选用4种遮光率为50%且辐射比例各异的有色光转换遮阳网：白色（985 μmol·m⁻²·s⁻¹）、红色（327 μmol·m⁻²·s⁻¹）、黑色（433 μmol·m⁻²·s⁻¹）及银色（405 μmol·m⁻²·s⁻¹）；以自然光下栽培（1000 μmol·m⁻²·s⁻¹）的植株作为对照组。每个处理组选取10株植株开展叶片与根系解剖结构分析。综上可得出结论：有色遮阳网可改变果冻棕榈（Butia capitata）的叶片与根系解剖结构。