Morpho-Physiological and Metal Accumulation Responses of Hemp Plants (<i>Cannabis Sativa</i> L.) Grown on Soil from an Agro-Industrial Contaminated Area
2019
Fabrizio Pietrini | Laura Passatore | Valerio Patti | Fedra Francocci | Alessandro Giovannozzi | Massimo Zacchini
Hemp is a promising plant for phytomanagement. The possibility to couple soil restoration to industrial crop cultivation makes this plant attractive for the management of contaminated sites. In this trial, <i>Cannabis sativa</i> L. plants were grown in a greenhouse on soils from two sites of “Valle del Sacco„ (Lazio Region, Italy), a wide area contaminated by agro-industrial activities. One site was representative of moderate and diffuse metal(loid) multi-contamination, above the Italian concentration limit for agriculture (MC—moderately contaminated). The second site showed a metal(loid) content below the aforementioned limit, as a typical background level of the district (C—control). After 90 days, biometric and physiological parameters revealed satisfactory growth in both soil types. MC-grown plants showed a slight, but significant reduction in leaf area, root, and leaf biomass compared with C-grown plants. Chlorophyll content and chlorophyll fluorescence parameters, namely the quantum yield of primary photochemistry (F<sub>v</sub>/F<sub>m</sub>) and the Performance Index (PI<sub>ABS</sub>), confirmed the good physiological status of plants in both soils. Metal(loid) analyses revealed that As, V, and Pb accumulated only in the roots with significant differences in MC- and C-grown plants, while Zn was found in all organs. Overall, preliminary results showed a satisfactorily growth coupled with the restriction of toxic metal translocation in MC-grown hemp plants, opening perspectives for the phytomanagement of moderately contaminated areas.
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