Menegolla Franciele, Hansel Fabricio Augusto, Degenhardt Juliana, Lazzarotto Marcelo
Universidade Federal do Paraná, Av. Prefeito Lothário Meissner, 623, Curitiba, PR, ZIP 80210-170, Brazil.
EMBRAPA Florestas, Estrada da Ribeira, KM 111, P.O. Box 319, Colombo, PR, ZIP 83411-000, Brazil.
Planta. 2025 Jan 5;261(2):24. doi: 10.1007/s00425-024-04604-x.
The mini-cutting physiological condition is vital for the rooting process. For accurate interpretation, considering all mini-cutting responses in an experiment is necessary to identify significant rooting-biomarkers. The study investigates rooting-biomarkers during vegetative propagation, focusing on Ilex paraguariensis (yerba mate) clones of contrasting mini-cutting rooting performance as a case study (i.e., hard vs. easy). To this end, leaf samples were collected at the time of the rooting experiment and stored in an ultrafreezer. After 120 days, five rooted and five dead cuttings from each clone were selected, and their previously-stored leaves were used for metabolite analysis. Utilizing gas chromatography-mass spectrometry analysis, we identified factors influencing rooting processes, stressing the significance of evaluating both rooted and dead mini-cutting for accurate interpretation. The analysis uncovers 86 compounds, being 47 metabolites identified in the leaves, including vital metabolites such as myo-inositol, sucrose, and 6-kestose, displaying varying concentrations among different clones and their responses. The research underscores the importance of assessing the mini-cutting response to prevent misinterpretations. This was evident in the study, particularly concerning variables like myo-inositol in both clones and chlorogenic acids and 6-kestose in the hard-to-root clone. In summary, the findings highlight the critical role of mini-cutting physiological conditions in the rooting process, providing valuable insights to enhance our understanding of plant propagation techniques.
微型插条的生理状态对生根过程至关重要。为了进行准确的解读，在实验中考虑所有微型插条的反应对于识别重要的生根生物标志物是必要的。本研究调查了营养繁殖过程中的生根生物标志物，以巴拉圭冬青（马黛茶）具有不同微型插条生根表现的克隆（即难生根与易生根）作为案例研究。为此，在生根实验时采集叶片样本并储存在超低温冰箱中。120天后，从每个克隆中挑选出5个已生根和5个死亡的插条，并将其先前储存的叶片用于代谢物分析。利用气相色谱 - 质谱分析，我们确定了影响生根过程的因素，并强调了评估已生根和死亡微型插条对于准确解读的重要性。分析发现了86种化合物，其中47种是在叶片中鉴定出的代谢物，包括肌醇、蔗糖和6 - 酮蔗糖等重要代谢物，它们在不同克隆及其反应中的浓度各不相同。该研究强调了评估微型插条反应以防止误解的重要性。这在研究中很明显，特别是在两个克隆中的肌醇以及难生根克隆中的绿原酸和6 - 酮蔗糖等变量方面。总之，研究结果突出了微型插条生理状态在生根过程中的关键作用，为增进我们对植物繁殖技术的理解提供了有价值的见解。
