Abstract
Bunias orientalis is a highly vigorous weed and the powerful taproot makes control difficult. Taking action against unwanted plant species at the development stage where they have a minimum of energy stored in their below ground plant parts has been efficient. Both young and older plants of B. orientalis were studied in order to identify this stage. Root dry-weight as a measurement of stored energy and the sprouting ability from root sections were studied as well as the transport direction of carbohydrates within the plants by using the isotop 14C.
No dry-weight minimum of the roots was found. However, from the isotope experiment with 14C, changes in the transport direction of carbohydrate reserves were detected. The smallest proportion of 14C was located in the roots at the stage where the source/sink dynamic of carbohydrate reserves shifted from the below-ground plant parts being the source to being the sink. This was considered a weak point in the seasonal life cycle of the species.
Young plants did not at any development stage show a defined drop in their regenerative capacity from root sections. Older plants had a minimum of regenerative capacity from root sections at the stage where the plants had started to elongate and had an average height of 26 cm and visible inflorescence. This corresponds well with the development stage found in the isotope experiment in which an indication of a weak point was identified.
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Oliver, B.W., Brandsæter, L.O., Govasmark, E. et al. Sprouting Dynamics of Bunias orientalis. J Plant Dis Prot 122, 141–149 (2015). https://doi.org/10.1007/BF03356543
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DOI: https://doi.org/10.1007/BF03356543