| Autor: |
De Prato, Luca, Ansari, Omid, Hardy, Giles E. S. J., Howieson, John, O'Hara, Graham, Ruthrof, Katinka X. |
| Předmět: |
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| Zdroj: |
Functional Plant Biology; 2023, Vol. 50 Issue 5, p378-389, 12p |
| Abstrakt: |
Growing a high-value crop such as industrial hemp (Cannabis sativa L.) in post-mining environments is economically and environmentally attractive but faces a range of biotic and abiotic challenges. An opportunity to investigate the cultivation of C. sativa presented itself as part of post-mining activities on Christmas Island (Australia) to profitably utilise disused phosphate (PS) quarries. Challenges to plant growth and cadmium (Cd) uptake were addressed in this study using potted plants under fully controlled conditions in a growth chamber. A complete nutritional spectrum, slow-release fertiliser was applied to all plants as a control treatment, and two levels of rock PS dust, a waste product of PS mining that contains 35% phosphorus (P) and 40 ppm of naturally occurring Cd, were applied at 54 and 162 g L−1. After 12 weeks, control plants (no PS dust) significantly differed in phenological development, with no flower production, lower aboveground biomass and reduced photosynthesis efficiency than those with P applied as rock dust. Compared with the controls, the 54 g L−1 level of P dust increased shoot biomass by 38%, while 162 g L−1 increased shoot biomass by 85%. The concentration of Δ9-tetrahydrocannabinol also increased with the higher P levels. Cd uptake from PS dust by C. sativa was substantial and warrants further investigation. However, there was no increase in Cd content between the 54 and 162 g L−1 application rates in seed and leaf. Results indicate that hemp could become a high-value crop on Christmas Island, with the readily available rock PS dust providing a source of P. Industrial hemp (Cannabis sativa) is an optimal candidate for growing in post-mining soils. However, contaminated substrates present a series of challenges about the effect on physiology, growth and secondary metabolites production for plants. This study investigated the use of a byproduct from phosphate quarries that naturally contain heavy metals such as cadmium, showing that phosphorus is a vital element for plant development and growth, and hemp can deal with a certain cadmium concentration on the substrate. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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