细胞学观察发现，直接发生的营养芽和花芽起源于薄层组织的亚表皮细胞层。
Cytological study shows that the vegetative and floral buds originated directly from the subepidermal layers.
芽管直接由表皮侵入。
沙棘表皮毛的主要功能是保护冬芽越冬。
The main function of the downiness of Hippophae mainly is to protect the buds overwintering.
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