Yuan Ye, Dickinson Nicholas
Faculty of Agriculture and Life Sciences, Lincoln University, Christchurch 7647, New Zealand.
High Country Salmon, Glenbrook, Twizel 7999, New Zealand.
Plants (Basel). 2024 Aug 8;13(16):2188. doi: 10.3390/plants13162188.
Some biostimulant products provide proven benefits to plant production, potentially offering more environmentally friendly, sustainable, and natural inputs into production systems. However, the transference and predictability of known benefits between different growth environments, application protocols, and management systems are fraught with difficulty. In this study, we carried out carefully controlled glasshouse and in vitro assays with applications of humic acids, protein hydrolysates, and seaweed extract to compare the variability of biostimulant effects and dosage-dependent variations across diverse conditions, encompassing a sufficient range to comprehensively assess their full spectrum of impacts. The results demonstrated a clear trend of dosage-dependent effects with each biostimulant exhibiting a significant growth-promoting effect within a critical concentration range, but detrimental effects when the concentration fell outside this range. While substantial growth-promoting effects were observed under glasshouse conditions, biostimulant applications tended to be more sensitive and generally led to negative impacts in sterilised conditions. The combined use of biostimulants mostly resulted in detrimental and toxicological responses with only two combined treatments showing marginal synergistic effects. The findings demonstrated a complex interplay between biostimulants and the growth conditions of plants. Lack of knowledge of the indirect effects of different growth media may result in negative impacts of biostimulant applications and combinations of products outside narrow critical concentration ranges.
一些生物刺激素产品已被证明对植物生产有益，有可能为生产系统提供更环保、可持续和天然的投入物。然而，在不同的生长环境、施用方案和管理系统之间，已知益处的传递性和可预测性充满困难。在本研究中，我们对腐殖酸、蛋白水解物和海藻提取物进行了精心控制的温室和体外试验，以比较生物刺激素效应的变异性以及在不同条件下剂量依赖性的变化，涵盖了足够广的范围以全面评估其全部影响。结果表明存在明显的剂量依赖性效应趋势，每种生物刺激素在临界浓度范围内均表现出显著的促生长效应，但当浓度超出该范围时则产生有害效应。虽然在温室条件下观察到了显著的促生长效应，但在无菌条件下，生物刺激素的施用往往更敏感，通常会导致负面影响。生物刺激素的联合使用大多产生有害和毒理学反应，只有两种联合处理显示出轻微的协同效应。这些发现表明生物刺激素与植物生长条件之间存在复杂的相互作用。对不同生长介质间接影响的了解不足，可能会导致在狭窄的临界浓度范围之外施用生物刺激素及其产品组合产生负面影响。
