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New generic circumscriptions in the tribe Crotalarieae (Fabaceae)

J.S. Boatwright, M. Wink, P.M. Tilney, B.-E. Van Wyk
2009 South African Journal of Botany  
flower drop in response to several concentrations of ethylene (0, 0.1, 0.2, 0.5, 1 and 2 µl l -1 ) over 96 h. High concentrations (0.5-2 µl l -1 ) promoted abscission of open and unopened flowers, while lower concentrations (0.1-0.2 µl l -1 ) induced abscission of unopened buds preferentially. Subsequent experiments examined soluble carbohydrate levels (by gas chromatography) and flower abscission in plants under simulated display (fluorescent lights) or transport (dark) conditions with or
more » ... itions with or without continuous 1-methylcyclopropene (1-MCP, 0.1 µl l -1 ) for 96 h. Under fluorescent lights, glucose and fructose levels declined after 24 h and then remained steady, but abscission was only observed after 72 and 96 h. In contrast, glucose and fructose levels of plants kept in the dark increased after 24 h, but by 96 h had returned to the same level as plants kept under fluorescent lights. Plants treated with 1-MCP were effectively protected from the effects of applied ethylene, exhibiting low levels of abscission. Soluble carbohydrate levels and flower abscission were also investigated in defoliated plants, the results of which will be discussed in the context of potential pathways of carbohydrate-induced abscission.
doi:10.1016/j.sajb.2009.02.029 fatcat:lxgke25nxzcktlpvpwgrq3e7om