Changes in the amide and amino acid composition of xylem exudate from perennial ryegrass (Lolium perenne L.) during regrowth after defoliation |
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Authors: | J Bigot J Lefevre J Boucaud |
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Institution: | (1) Laboratoire de Physiologie et Biochimie végétales, Institut de Recherches en Biologie Appliquée, (I.R.B.A.), Université de Caen, F-14032 Caen Cedex, France |
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Abstract: | The paper presents the results of amino acid analyses in xylem sap during leaf regrowth of ryegrass plants defoliated firstly
at the 8th and secondly at the 12th week of culture. The free amino acid composition of leaves, stubble and roots was also
determined and some of the results are reported. Prior to defoliation, xylem sap contained a high proportion of amides, particularly
glutamine. During regrowth after defoliation, the proportion of asparagine in the xylem sap increased until the third day
when the highest ratios of asparagine/glutamine appeared. The results are compared with relative amounts of free amino acids
in the different plant parts and discussed in relation to source-sink nitrogen transfer. |
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Keywords: | asparagine free-amino acids glutamine Lolium perenne L regrowth xylem sap exudation |
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