Adriana Maria Griebeler, Maristela Machado Araujo, Felipe Turchetto, Ezequiel Gasparin, Claudia Costella, Berta Maria Heinzmann, Bibiana Fontana Batista, Fábio André da Encarnação, Osmarino Pires dos Santos, Nathália Pimentel, Júlia Luiza Stahl
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In this context, the present study aimed to evaluate the effect of applying different concentrations of the pyroligneous acid (PA) of <i>Acacia mearnsii</i> De Wild, through foliar spraying, on mini-cuttings of <i>E. benthamii</i>, <i>E. dunnii,</i> and the hybrid, <i>E. urophylla</i> × <i>E. dunnii</i>, during the summer and winter periods in southern Brazil. The experiments were carried out in a greenhouse in a factorial scheme, testing four PA concentrations (0 [control], 2%, 4%, and 6%) and five clones, <i>E. benthamii</i> (B1 and B2), <i>E. dunnii</i> (D1 and D2), and <i>E. urophylla</i> × <i>E. dunnii</i> (UD). Thirty days after staking, the percentage survival of the mini-cuttings was evaluated, and at 50 days, adventitious rooting and callogenesis, as well as the morphological attributes of the mini-cuttings were evaluated. Chemical analysis of the PA revealed the presence of phenolic compounds, primarily syringol, pyrocatechol, and guaiacol derivatives. The PA of <i>A. mearnsii</i> was shown to be a potential alternative input for maximizing the rooting percentages of subtropical <i>Eucalyptus</i> clones that are difficult to propagate. PA contributed to greater allocation of dry matter and quality (Dickson Quality Index) of clonal seedlings, except for clone D2. Spraying concentrations between 2 and 4% PA, applied twice a week, optimized the subtropical eucalyptus mini-cuttings, with the dose of maximum technical efficiency being (DMTE) estimated between 3.5 and 4.5% PA. 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引用次数: 0
摘要
摘要 制定旨在优化桉树物种（尤其是那些难以生根的物种）克隆繁殖的策略具有重要意义。在这种情况下，本研究旨在评估在巴西南部的夏季和冬季，通过叶面喷洒不同浓度的 Acacia mearnsii De Wild 的焦木质酸（PA）对 E. benthamii、E. dunnii 和杂交种 E. urophylla × E. dunnii 的小型插条的影响。实验在温室中以因子方案进行，测试了四种 PA 浓度（0 [对照]、2%、4% 和 6%）和五种克隆：E. benthamii（B1 和 B2）、E. dunnii（D1 和 D2）以及 E. urophylla × E. dunnii（UD）。插条插植 30 天后，对微型插条的存活率进行评估；插植 50 天后，对微型插条的不定根和胼胝发生以及形态特征进行评估。PA的化学分析显示存在酚类化合物，主要是丁香酚、焦儿茶酚和愈创木酚衍生物。研究表明，A. mearnsii的PA是一种潜在的替代投入，可最大限度地提高难以繁殖的亚热带桉树克隆的生根率。除克隆 D2 外，PA 有助于提高克隆幼苗的干物质分配率和质量（迪克森质量指数）。喷洒浓度在 2% 到 4% 之间的 PA（每周喷洒两次）优化了亚热带桉树的小型扦插，最大技术效率（DMTE）剂量估计在 3.5% 到 4.5% PA 之间。PA 是生产 E. benthamii、E. dunnii 和杂交种 E. urophylla × E. dunnii 的新型天然投入品。
Acacia mearnsii pyroligneous acid as a promoter of rooting and quality of rooted cuttings of subtropical Eucalyptus
Key message
The pyroligneous acid of Acacia mearnsii enhanced the rooting, promoted higher carbon allocation and quality of rooted cuttings representing a novel, natural input for subtropical Eucalyptus clone production.
Abstract
The development of strategies aimed at optimizing the clonal propagation of Eucalyptus species, especially those that are difficult to root, is of great importance. In this context, the present study aimed to evaluate the effect of applying different concentrations of the pyroligneous acid (PA) of Acacia mearnsii De Wild, through foliar spraying, on mini-cuttings of E. benthamii, E. dunnii, and the hybrid, E. urophylla × E. dunnii, during the summer and winter periods in southern Brazil. The experiments were carried out in a greenhouse in a factorial scheme, testing four PA concentrations (0 [control], 2%, 4%, and 6%) and five clones, E. benthamii (B1 and B2), E. dunnii (D1 and D2), and E. urophylla × E. dunnii (UD). Thirty days after staking, the percentage survival of the mini-cuttings was evaluated, and at 50 days, adventitious rooting and callogenesis, as well as the morphological attributes of the mini-cuttings were evaluated. Chemical analysis of the PA revealed the presence of phenolic compounds, primarily syringol, pyrocatechol, and guaiacol derivatives. The PA of A. mearnsii was shown to be a potential alternative input for maximizing the rooting percentages of subtropical Eucalyptus clones that are difficult to propagate. PA contributed to greater allocation of dry matter and quality (Dickson Quality Index) of clonal seedlings, except for clone D2. Spraying concentrations between 2 and 4% PA, applied twice a week, optimized the subtropical eucalyptus mini-cuttings, with the dose of maximum technical efficiency being (DMTE) estimated between 3.5 and 4.5% PA. PA represents a novel, natural input for the production of clones of E. benthamii, E. dunnii, and the hybrid, E. urophylla × E. dunnii.
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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