上胚轴

The development of xylem is of mesarch.Stomata are monocyclic type.

叶脉、叶柄、上胚维管束均为外韧型。

The regeneration systems of “kuai shi” plum were established, using epicotyl and hypotyl as exophyte.

以快上、下胚为外植体，建立了三华胚再生体系，获得了再生植株。