primary phloem

(3)初生韧皮部(primary phloem)：其主要功能是输导有机物质。初生韧皮部形成若干束分布于初生木质部辐射角之间，与初生木 …

丝锁气压... ... "第一次寄生性昆虫"," Primary parasite" "原始靭皮部"," Primary phloem" "初生纹孔位置"," Primary pit field" ...

...分别称为主木质部 (primary xylem)与主韧皮部(primary phloem)。