adj.[植]向頂?shù)?/p>

Acropetal differentiation of the cambium layer continues as the primary root elongates. 形成層的向頂分化像初生根伸長一樣在繼續(xù)進行。

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鱗片的葉腋處產(chǎn)生，之后其由基部向頂部連續(xù)發(fā)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。 通常一個球果有 4對苞片 ,中部兩對可育 ,靠球果頂端一對各產(chǎn)生一枚胚珠 ,其下一對各兩枚。

Compare acropetal. 比較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. 向頂：描述植物器官生長或者發(fā)育的一個過程，這個過程是自下而上的，因此較年老的部分在底端，而幼小的部分在頂端。

adj.[植]向頂?shù)?/p>