Roads, railways, water and gas mains, sewage pipes and electricity cables all move things around. So do the blood vessels of animals and the sap-carrying xylem and phloem of plants.
The results also indicated that omethoate was transported to the xylem along with SAP flows went upward and then transferred to the phloem as taking a pest-controlled effect.
检测还表明：氧化乐果由木质部随树液向上输导后再转移到韧皮部而起杀虫作用。
3
The fall of phloem exudation rate concurred with a decrease of potassium concentration and an increase of sucrose concentration of sap.