A Water-Soluble β-Triketone Enriched Extract of Manuka Oil Has Increased Weed Control Efficacy Compared to Vinegar and D-Limonene in a Field and Greenhouse Evaluation

IF 2.3 Q1 AGRICULTURE, MULTIDISCIPLINARY ACS agricultural science & technology Pub Date : 2024-08-13 DOI:10.1021/acsagscitech.4c0022510.1021/acsagscitech.4c00225
T. Casey Barickman*, Charles L. Cantrell and Amber Reichley, 
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Abstract

Weed management strategies for specialty and organic crop production are challenging due to limited chemical weed control products with good efficacy that are cost-effective. The need for new bioherbicide modes of action has become increasingly urgent in modern agriculture, as most bioherbicides have nonspecific modes of action with no systemic activity. Introducing new modes of action is essential to diversifying weed control strategies, minimizing the risk of resistance development, and ensuring sustainable weed management practices. By fostering innovation in bioherbicide development and promoting the use of novel modes of action, we can safeguard our agricultural systems, reduce the environmental impact of weed management, and maintain the ability to feed a growing global population while preserving the long-term health of our ecosystems. Manuka oil is derived from the leaves and branches of the Manuka tree (Leptospermum scoparium) and contains β-triketones. The β-triketone-rich fraction contains leptospermone and inhibits a key enzyme, p-hydroxyphenylpyruvate dioxygenase (HPPD). This process directly inhibits carotenoid biosynthesis, upstream in the biochemical pathway, which causes damage to the photosynthetic apparatus and leads to bleaching of the leaf tissue, which eventually kills the plant. The β-triketone extract at 2% and 4% had up to 97% control against different weed species in field and greenhouse evaluations. The β-triketone extract was significantly more efficacious vs other bioherbicides such as 20% vinegar and 12.5% D-limonene. Additionally, the β-triketone extract was just as effective as a 2% glyphosate treatment in the greenhouse evaluation against Amaranthus palmeri and Digitaria sanguinalis. The β-triketone extract also reduced Cyperus esculentus growth by 70% at 9 days after treatment. Thus, there is significant evidence that commercializing a water-soluble β-triketone-enriched extract of Manuka oil can be an effective weed control strategy in crop production systems, especially in specialty and organic cropping systems where the need for bioherbicides is critically imperative.

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在田间和温室评估中,一种富含水溶性β-三酮的麦卢卡油提取物与醋和 D-柠檬烯相比,具有更强的除草功效
特种作物和有机作物生产中的杂草管理策略极具挑战性,因为具有良好功效且成本效益高的化学除草产品非常有限。在现代农业中,对新型生物除草剂作用模式的需求日益迫切,因为大多数生物除草剂的作用模式都是非特异性的,没有系统活性。引入新的作用模式对于杂草控制策略的多样化、最大限度地降低抗药性产生的风险以及确保可持续的杂草管理实践至关重要。通过促进生物除草剂的创新开发和推广新型作用模式的使用,我们可以保护我们的农业系统,减少杂草管理对环境的影响,保持养活不断增长的全球人口的能力,同时维护生态系统的长期健康。麦卢卡油提取自麦卢卡树(Leptospermum scoparium)的叶子和树枝,含有 β-三酮。富含 β-三酮的部分含有瘦肉精,能抑制一种关键酶--对羟基苯丙酮酸二氧化酶(HPPD)。这一过程会直接抑制生化途径上游的类胡萝卜素生物合成,从而对光合装置造成损害,导致叶片组织白化,最终使植物死亡。在田间和温室评估中,2% 和 4% 的 β-三酮提取物对不同杂草种类的控制率高达 97%。与其他生物除草剂(如 20% 的醋和 12.5% 的 D-柠檬烯)相比,β-三酮提取物的功效明显更高。此外,在温室评估中,β-三酮萃取物对棕榈苋(Amaranthus palmeri)和矢车菊(Digitaria sanguinalis)的效果与 2% 草甘膦处理相同。在处理后 9 天,β-三酮提取物还能使香附的生长量减少 70%。因此,有大量证据表明,将麦卢卡油的水溶性β-三酮富集提取物商业化,可以成为作物生产系统中一种有效的除草策略,尤其是在需要生物除草剂的特殊和有机种植系统中。
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