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Changes in use of both stored and newly synthesized sources of carbon (C) and nitrogen (N) were investigated during rooting of leafy cuttings of  Larix  ×  eurolepis  A. Henry. We used dual  13 C and  15 N long-term labeling of reserves of stock plants and followed isotope dilution of the labels in the cuttings to determine the respective proportions of C and N derived from stock plant reserves ( Q  C,old ,  Q  N,old ) and from newly synthesized sources ( Q  C,new ,  Q  N,new ). We also assessed their partitioning into the growing needles and roots. Because rooting development occurred over several months, destructive harvests were made during three periods ( t  0 : April 9;  t  1 : May 15 to June 5;  t  2 : June 12 to June 26). Total C content ( Q  C ) of cuttings did not change with time, whereas total N content ( Q  N ) decreased significantly between  t  0  and  t  2 . In rooted cuttings, unlike unrooted cuttings, total N concentration decreased less markedly in needles and in the lower stem component between  t  1  and  t  2  than between  t  0  and  t  2 . The lower stem of rooted cuttings contained more  Q  N,old  than that of unrooted cuttings and showed lower C:N and  13 C: 15 N ratios. The increase in  Q  N,new  in the lower stem was positively correlated with rooting status. At  t  1 , new roots appeared and grew mainly at the expense of  Q  C,new  and  Q  N,old . By  t  2 , root growth was mainly dependent on new assimilates. We conclude that in leafy cuttings the initial amount of N reserves, rather than C reserves, may constitute a limiting factor for rooting.

Carbon and nitrogen mobilization in Larix × eurolepis leafy stem cuttings assessed by dual 13 C and 15 N labeling: relationships with rooting