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
The trans ported solutes Principal constituent: sucrose(80%) Minerals: K
➢ Principal constituent: sucrose (80%) ➢ Minerals: K The transported solutes
Sources and sinks Conce Source: production consumption e. g. mature leaves Sink: net importer or consumer e.g. roots and developing fruits
Sources and Sinks Source: production ＞ consumption e.g. mature leaves Sink: net importer or consumer e.g. roots and developing fruits
Transport direction Direction: source sink U Down. both directions velocity ① different plants ② young>old 100 cmoh-1 ③day> night
Transport direction Direction: source sink Up, Down, both directions velocity: 100 cm•h-1 ① different plants ② young＞old ③ day＞night