caa a22 4500 477109861 CHVBK 20180405111605.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF02257533 doi (NATIONALLICENCE)springer-10.1007/BF02257533 Root growth dynamics of Brussels sprouts ( Brassica olearacea var. gemmifera ) and leeks ( Allium porrum L.) as reflected by root length, root colour and UV fluorescence [Elektronische Daten] [A. Smit, Alessandra Zuin] Minirhizotron observations of roots of leeks and Brussels sprouts grown in the Wageningen Rhizolab were used to study the dynamics of root length. Day of appearance and the time of decay were assessed for individual root segments visible on the minirhizotron surface. A Brussels sprouts crop produced much more root length than leeks, but the average longevity of these roots was about half that of leek roots. To investigate whether root colour or UV fluorescence could be used as a quantitative index of root functionality or root age, changes in root "colour” (on a scale of greys) over time were measured with interactive image analysis. In both crops a gradual change towards black was found with ageing. Measurements of the intensity of the UV fluorescence showed that leek roots fluoresced more than Brussels sprouts roots. Over time, UV fluorescence decreased in Brussels sprouts roots but increased in leek roots. It is concluded that UV fluorescence cannot be used as a universal indicator of root age or root functionality, but in some plant species it may be used to separate (transparent) roots from the background with image analysis techniques. Kluwer Academic Publishers, 1996 Brussels sprouts nationallicence image analysis nationallicence leeks nationallicence minirhizotrons nationallicence root decay nationallicence roots nationallicence turn over nationallicence UV fluorescence nationallicence DAP : Days after planting nationallicence DIFGV : Difference in Grey Value between roots and background (−) nationallicence DIFUV : Difference in Grey Value between roots and background under UV light (−) nationallicence LRL : the standing living root length (cm cm−2) nationallicence t : time (day) nationallicence TDL : Total Dead Root Length (cm cm−2) nationallicence TPL : Total Produced Length of roots (cm cm−2) nationallicence UV : Ultra Violet nationallicence Smit A. DLO Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, NL-6700AA, Wageningen, the Netherlands aut Zuin Alessandra Department of Phytopathology, University of Padova, Via Gradenigo 8, Padova, Italy aut Plant and Soil Kluwer Academic Publishers 185/2(1996-09-01), 271-280 0032-079X 185:2<271 1996 185 11104 https://doi.org/10.1007/BF02257533 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02257533 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Smit A. DLO Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, NL-6700AA, Wageningen, the Netherlands aut NATIONALLICENCE 700 1- Zuin Alessandra Department of Phytopathology, University of Padova, Via Gradenigo 8, Padova, Italy aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers 185/2(1996-09-01), 271-280 0032-079X 185:2<271 1996 185 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer