caa a22 4500 477110614 CHVBK 20180405111607.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00011597 doi (NATIONALLICENCE)springer-10.1007/BF00011597 Inter-varietal differences in xylem exudate composition and growth under contrasting forms of N supply in cucumber [Elektronische Daten] [P. Zornoza, M. Gonzalez, S. Serrano, O. Carpena] Variations in the inorganic and organic composition of xylem exudate, growth and N content under contrasting forms of N supply in three cucumber cultivars (Hyclos, Medusa and Victory) were studied in glasshouse conditions. The plants were grown hydroponically with two NO3 -:NH4 + ratios (100:0 and 60:40). The xylem sap of Medusa grown with both N sources displayed an increase of organic N and carboxylate concentrations and a decrease of cations, inorganic anions and carbohydrates compared with that of those grown with NO3 - alone, showing a higher growth and N content in tissues and thus better utilization of N supplied as NO3 - and NH4 +. Mixed N nutrition in Hyclos caused the greatest amounts of NO3 - and NH4 + in xylem sap, lower root weight and N levels in the leaves, while its root was unable to generate an adequate supply of organic N compounds. Despite the levels of cations, inorganic and organic anions were reduced by the NH4 + supplied to Victory, the ionic balance in the xylem sap, growth and N content remained similar to that of those supplied with NO3 - alone. Finally, the cucumber cultivars studied here, responded differently to the form of N supplied, it may partly be due to their ability of assimilating N in the roots and partly to the form in which the N is translocated to the shoot. Kluwer Academic Publishers, 1996 ammonium nationallicence carbohydrates nationallicence carboxylates nationallicence cultivar nationallicence growth nationallicence nitrate nationallicence xylem exudate nationallicence Zornoza P. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut Gonzalez M. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut Serrano S. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut Carpena O. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 178/2(1996-01-01), 311-317 0032-079X 178:2<311 1996 178 11104 https://doi.org/10.1007/BF00011597 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011597 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zornoza P. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut NATIONALLICENCE 700 1- Gonzalez M. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut NATIONALLICENCE 700 1- Serrano S. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut NATIONALLICENCE 700 1- Carpena O. Departamento de Química Agrícola, Facultad de Ciencias, Universidad Autónoma, 28049, Madrid, Spain aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl// 178/2(1996-01-01), 311-317 0032-079X 178:2<311 1996 178 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer