adj.[植]向顶的

Acropetal differentiation of the cambium layer continues as the primary root elongates. 形成层的向顶分化像初生根伸长一样在继续进行。

In the early December, the first bract primordium was formed in the axil scale at the cone base, then bract initiation had occurred in acropetal direction. 12月初，最初的苞片原基在雌球果原基的鳞片的叶腋处产生，之后其由基部向顶部连续发生。

Usually, two pairs of the fertile bracts in the middle of the cone subtend six ovules, which initiate in an acropetal manner. 在北京 ,雌球果原基 7月分化。 通常一个球果有 4对苞片 ,中部两对可育 ,靠球果顶端一对各产生一枚胚珠 ,其下一对各两枚。

Compare acropetal. 比较acropetal。

Acropetal Describing a process(such as growth or development) that progresses from the base or boint of attachment, so that the oldest parts are at the base and the youngest are at the tip. 向顶：描述植物器官生长或者发育的一个过程，这个过程是自下而上的，因此较年老的部分在底端，而幼小的部分在顶端。