The composition of phloem exudate tabacco/mmol L-1 soybean /mmol L-1 Sucrose 460.0 490.0 Amino 83.0 115.0 acids 94.0 47.0 Na 5.0 4.4 14.0 Mg 4.3 5.8 Ca 2.1 0.16 Fe 0.17 0.13 Zn 0.24 0.08 PH 7.9 8.0 返回The composition of phloem exudate tabacco ／mmol L-1 soybean ／mmol L-1 Sucrose 460.0 490.0 Amino acids 83.0 115.0 K 94.0 47.0 Na 5.0 4.4 P 14.0 Mg 4.3 5.8 Ca 2.1 0.16 Fe 0.17 0.13 Zn 0.24 0.08 PH 7.9 8.0 返回