(1) The pericycle produces the latent roots and periderm.

(2) The periderm of root replaces epidermis.

(3) The secondary structure of the root consisted of periderm and vascular cylinders.

(4) The phellem of periderm and special morphological structure of sweet potato "Lushu 780" and "Shengli 00" play the role of a barrier to the spread and invasion of nematodes.

(5) Periderm, lenticelle and secondary vascular tissue in the gynophore are produced due to its secondary growth.

(6) The epidermis has been replaced by periderm on the surface of stem.

(7) In damaged stems and roots, and in those undergoing secondary growth, it is replaced by a secondary layer, the periderm.

(8) Results The secondary structure of the roots of Taxus chinensis var. mairei consisted of the periderm and vascular cylinder(stele). Axial and radial systems formed the secondary xylem of the roots.

(9) In variety "Thin Skin"there is secretory structure in parenchyma by inner periderm.

(10) The vascular ray was developed and the development of periderm was obvious.

(11) Several layers of cortex parenchymal cells near the proximal periderm in scale degraded after releasing dormancy of the bulb.

(12) The biennial rhizome of D. zingiberensis is composed of three parts: the periderm, the ground tissue and the vascular bundle.

(13) The results showed that all the cross branch roots of different sizes consisted of periderm, secondary vascular tissue and tetrarch primary xylem.

(14) Results The secondary structure of the roots of Taxus chinensis var. mairei consisted of the periderm and vascular cylinder (stele).

(15) The dorsal epidermis had three layers of cells at the 34th day of incubation. Pigmentation started to appear in the cells of periderm at the 40th day of incubation.

(16) Suberinite occurs commonly in Mesozoic coal measures and terrestrial organic matter source rocks in Northwest China, which is formed from suberized cell walls, particularly in plant periderm.

(17) However treatment with GA by itself promoted callus formation and inhibited new periderm, cambium and vascular tissues differentiation.

(18) It had secondary structure and the secondary protective tissue was periderm.

(19) There was hypha in 1- 10layers cell of surface in young tumour-body base. Grown tumour-body formed periderm, vascular bundle and a lot of pith cells.

(20) The harmful effect of injecting chemical into tree on the xylem, bast, periderm and tree body was studied.