2026-10-12T14:02:07Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33722809 2026-09-14T08:41:39Z category_23848 item_type_3 month_year_09_2026

Supplementary Data – Alpinia chinensis essential oils Thi Ho (19141987) Agricultural biotechnology not elsewhere classified Alpinia chinensis bioherbicide Echinochloa spp. essential oil herbicide resistance Leptochloa chinensis <p dir="ltr">Herbicide resistance is eroding the reliability of conventional grass-weed control in direct-seeded rice and increases the need for chemically diverse, biorational leads. We evaluated essential oils (EOs) obtained separately from the rhizome, leaf, fruit, stem and flower of Alpinia chinensis (Retz.) Roscoe. GC–MS identified 74 volatile constituents representing 96.07–97.63% of each oil and revealed pronounced organ-specific chemical differentiation. Phytotoxicity was quantified at 0–1.60 µL mL⁻¹ against two cultivated rice genotypes (OM18 and RVT), weedy rice, Echinochloa crus-galli, E. colona and Leptochloa chinensis. Factorial inference based on raw dish-mean seedling lengths showed highly significant effects of dose, EO source organ and their interaction for every weed response (all P < 0.001; partial η² = 0.812–1.000). L. chinensis was exceptionally sensitive: leaf EO caused 100% shoot and root inhibition at 1.60 µL mL⁻¹, while ED₅₀ estimates within the tested range were 0.189–0.412 µL mL⁻¹ for shoots and 0.094–0.433 µL mL⁻¹ for roots. Echinochloa responses were strong but oil- and species-dependent, whereas weedy-rice shoots showed organ-specific hormesis. Across the full dose range, leaf EO maximized weed bioactivity, but flower EO produced the widest weed–rice selectivity gap (18.46 percentage points; 95% bootstrap CI 17.91–19.00) and the highest weed/rice ratio (1.96; 95% CI 1.91–2.02). These results provide organ-resolved evidence that A. chinensis contains chemically distinct phytotoxic mixtures with contrasting potency and crop selectivity, prioritizing flower EO for selective formulation and leaf EO for bioactivity-guided fractionation.</p> 2026-09-14T08:41:39Z Dataset Dataset 10.6084/m9.figshare.33722809.v1 https://figshare.com/articles/dataset/Supplementary_Data_Alpinia_chinensis_essential_oils/33722809 CC BY 4.0