Fig. 6

Differential distribution of key enzyme activities in larch leaf metabolites between different light environments (n = 3). (a) sucrose synthase (SS); (b) sucrose phosphate synthase (SPS); (c) sucrose invertase (INV); (d) phosphoenolpyruvate carboxylase (PEPC); (d) citrate synthase (CS); (f) L-phenylalanine ammonia-lyase (PAL). *: p < 0.05; **: p < 0.01; ***: p < 0.001; ****: p < 0.0001.