Abstract：
The present study was designed to assess the allelopathic potential of invasive weed Ageratina adenophora leaf extracts on seed germination and seedling development efficiency of native tree [viz. Quercus leucotrichophora A. Camus (Oak) and Pinus roxburghii Sarg. (Pine)] and crop [(Triticum aestivum L. (Wheat) and Lens culinaris Medik. (Lentil)] species of Kumaun Himalaya. Pot experiments were conducted in the glasshouse of the Botany Department, D.S.B. Campus, Kumaun University Nainital, following a Completely Randomized Block Design (CRBD) with three treatments (C1-25%, C2-50%, and C3-100% of aqueous leaf extract) and one control, each with five replicates. The experiment lasted one year for tree species and continued until the seed maturation phase for crop species. Parameters such as seed germination proportion, root and shoot measurements, biomass, and crop productivity traits were recorded accordingly. Our bioassay results indicated that the inhibitory effect of leaf extracts on the measured traits of the selected native species was proportional to the applied extract concentrations of A. adenophora. Overall, lentil among crops and oak among tree species exhibited more inhibition compared to wheat and pine, respectively. At the highest concentration, reductions of 44%, 34%, 36%, and 24% in biomass production capacity were recorded for wheat, lentil, pine, and oak, respectively, while wheat and lentil productivity decreased by up to 33% and 45%, respectively. These results suggest that water-soluble allelochemicals produced by A. adenophora may impede the establishment of selected crop and tree species in agroecosystems and forest ecosystems invaded by this weed species. However, further studies on the characterization of phytochemicals and their specific role in seed germination and growth are warranted. Furthermore, the allelopathic potential of A. adenophora can be explored for the preparation of biopesticides and nature-friendly option to improve soil health, crop productivity, and reduce environmental pollution and management of this invasive weed.
摘要：
本研究旨在评估入侵杂草Ageratina腺样体叶提取物对本地树种子萌发和幼苗发育效率的化感潜力[即。白三叶树（橡树）和刺山松。（松树）]和作物[（小麦（小麦）和柳叶刀。（扁豆）]Kumaun喜马拉雅的物种。盆栽实验是在植物学部的温室里进行的,D.S.B.校园，KumaunUniversityNainital,采用三种治疗的完全随机区组设计(CRBD)(C1-25%，C2-50%,和C3-100%的含水叶提取物)和一个对照，每个有五个重复。对于树种，该实验持续了一年，并持续到农作物的种子成熟期。种子发芽率等参数，根和芽测量，生物量，并相应记录了作物生产力性状。我们的生物测定结果表明，叶提取物对所选天然物种的测量性状的抑制作用与所应用的A.adenophora提取物浓度成正比。总的来说,与小麦和松树相比，作物中的小扁豆和树种中的橡树表现出更大的抑制作用，分别。在最高浓度下，减少44%,34%,36%,小麦的生物量生产能力为24%，扁豆,松树，橡木,分别,而小麦和小扁豆的生产率下降了33%和45%，分别。这些结果表明，紫草产生的水溶性化感物质可能会阻碍该杂草入侵的农业生态系统和森林生态系统中选定的作物和树种的建立。然而,需要进一步研究植物化学物质的特性及其在种子萌发和生长中的特定作用。此外，可以探索A的化感潜力，用于制备生物农药和自然友好的选择，以改善土壤健康，作物生产力，并减少环境污染和这种入侵杂草的管理。
