Root-applicable coffee silverskin solution acts as a biostimulant in broccoli (Brassica oleracea L. var. italica): enhancing growth, metabolism, and soil microbial activity

IF 4.6 2区农林科学 Q1 HORTICULTURE

Scientia Horticulturae Pub Date : 2026-10-01 Epub Date: 2026-10-03 DOI:10.1016/j.scienta.2026.115212

Giovanna Salbitani, Rosanna Bossa, Federica Carraturo, Michela Salamone, Melania Di Colandrea, Maria Rosaria Chianese, Tammaro Bencivenga, Marco Guida, Francesco Loreto, Simona Carfagna

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引用次数: 0

Abstract

Coffee silverskin (CS), the main by-product of coffee roasting, is generated in large quantities worldwide and represents a promising resource for sustainable agriculture. Here, we evaluated the biostimulant potential of an aqueous coffee silverskin solution (CSS) on the growth, physiology and metabolism of Brassica oleracea L. var. italica, comparing root irrigation and foliar application.

CSS applied via irrigation significantly enhanced plant growth and metabolic performance, whereas foliar application had neutral or negative effects. Irrigation with 4% CSS increased leaf number (+62%), leaf area (+122%) and shoot length (+37%) compared to controls. Leaf fresh biomass increased up to ∼10-fold in irrigated plants. CSS irrigation also promoted higher chlorophyll content, improved photosynthetic performance (higher net photosynthesis and stomatal conductance trends), and reduced non-photochemical quenching, indicating more efficient light use. Biochemically, irrigated plants showed increased protein content (+50%), polyphenol accumulation (+59%), and auxin levels (up to +154%). In parallel, CSS irrigation enhanced soil microbial abundance and diversity, including beneficial fungi such as Trichoderma spp., suggesting a contribution of the rhizosphere microbiome to the observed effects.

Coffee silverskin-derived solutions act as effective biostimulants when applied to the root system, improving plant growth, metabolism and potentially soil microbial interactions. These findings support the valorization of coffee roasting by-products as sustainable inputs in crop production systems.

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根适用的咖啡银皮溶液在西兰花（Brassica oleracea L. ar. italica）中作为生物刺激剂：促进生长，代谢和土壤微生物活性

咖啡银皮（CS）是咖啡烘焙的主要副产品，在世界范围内大量生产，是可持续农业的一种有前途的资源。本研究通过比较根灌和叶面喷施咖啡银皮水溶液（CSS）对甘蓝生长、生理和代谢的生物刺激作用，发现叶面喷施咖啡银皮水溶液（CSS）对甘蓝生长和代谢有显著的促进作用，而叶面喷施咖啡银皮水溶液对甘蓝生长和代谢无显著影响。与对照相比，用4% CSS灌溉的叶片数增加了62%，叶面积增加了122%，茎长增加了37%。在灌溉植株中，叶片新鲜生物量增加了10倍。CSS灌溉还提高了叶绿素含量，改善了光合性能（更高的净光合作用和气孔导度趋势），减少了非光化学猝灭，表明更有效地利用了光。从生化角度看，灌水植株的蛋白质含量（+50%）、多酚积累（+59%）和生长素水平（+ 154%）均有所增加。与此同时，CSS灌溉增加了土壤微生物的丰度和多样性，包括有益真菌，如木霉，这表明根际微生物组对观察到的效果有贡献。当应用于根系时，咖啡银金衍生的溶液作为有效的生物刺激剂，改善植物生长，代谢和潜在的土壤微生物相互作用。这些发现支持咖啡烘焙副产品作为作物生产系统可持续投入的价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scientia Horticulturae 农林科学-园艺

CiteScore

8.60

自引率

4.70%

发文量

796

审稿时长

47 days

期刊介绍： Scientia Horticulturae is an international journal publishing research related to horticultural crops. Articles in the journal deal with open or protected production of vegetables, fruits, edible fungi and ornamentals under temperate, subtropical and tropical conditions. Papers in related areas (biochemistry, micropropagation, soil science, plant breeding, plant physiology, phytopathology, etc.) are considered, if they contain information of direct significance to horticulture. Papers on the technical aspects of horticulture (engineering, crop processing, storage, transport etc.) are accepted for publication only if they relate directly to the living product. In the case of plantation crops, those yielding a product that may be used fresh (e.g. tropical vegetables, citrus, bananas, and other fruits) will be considered, while those papers describing the processing of the product (e.g. rubber, tobacco, and quinine) will not. The scope of the journal includes all horticultural crops but does not include speciality crops such as, medicinal crops or forestry crops, such as bamboo. Basic molecular studies without any direct application in horticulture will not be considered for this journal.