Phenology and Source-Sink Dynamics of Carbohydrates in Relation to Management of Perennial Weeds: Cirsium arvense (L.) Scop and Tussilago farfara L

摘要: Perennial weed infestations are putting severe constraints on organic and conventional farming. Cirsium arvense (L.) Scop. Tussilago farfara L. have high vegetative regeneration capacity from underground organs. These organs can reach deep soil layers, which prevent them being easily uprooted. In our research, we primarily addressed the importance of source-sink dynamics carbohydrates at different phenological stages related results to eventual management strategies. Experimental work was carried out under greenhouse and/or growth chamber conditions. The first study spanned roots/rhizomes planting shoot establishment. second began after establishment included rosette flowering stages. third about storage in parts. And finally, a fourth aimed unraveling effect drought new shoots these perennials. To determine depletion carbohydrate associated with development, destructively sampled roots C. rhizomes T. nonstructural were measured using HPLC. We found that fructan highest time, but it decreased by releasing fructose as shooting progressed. However, before released depleted, reloaded photo-assimilates. This demonstrated 14C labelling track commencement basipetal translocation conclusion appreciable starts 6 8 fully developed leaves for arvense, respectively. falls between 500 600 degree days or around 21 23 emergence experimental After maximum net photosynthesis disturbed undisturbed clones over period 3 weeks, stage stage. Maximum there no differences clones. Our physiological integration other clonal species seems be absent farfara, suggesting autonomous. To understand storage, juvenile mature plants grown temperatures. showed polymerization fructans low temperatures not farfara. Polymerization significantly plants. Only dry weight reflected content. is continuous propagules facilitates survival two perennials thus complicates their control. Gradient water content during Elytrigia repens E. more tolerant stress than broadleaf arvense. prone compared if consider relationship biomass. susceptibility might give an opportunity window managing perennial weeds.