Histopathology of Seed-Borne Infections - Applied Research Center ...

Reproductive Structures and Seed Formation 39per epo mlentperAintepp hs izscBscepo oml pent entkepphsizkCperfvbscEendFvbwGDHFIGURE 2.17 Development of seed coat and pericarp in Lactuca scariola. A, B, Ls part ofovary wall and integument at megaspore mother cell and four-nucleate embryo sac stages,respectively. C, Ls part of integument at organized embryo sac stage showing periendothelium.D, Ts mature cypsil having fibrovascular bundles in ridges. E, F, Ts and Ls portions of pericarpand seed coat, respectively. G, H, Epidermal cells and sclereid fiber from maceration. Notethe proportion of the body and spine portions in epidermal cells. (Abbreviations: cot, cotyledon;end, endosperm; ent, endothelium; epo, outer epidermis of integument; epp, epidermisof pericarp; fvb, fibrovascular bundle; hs, hypodermis; int, integument; iz, inner zone of thinwalledcells; k, crystals; ml, middle layers; oml, outer middle layers; pent, periendothelium;per, pericarp; sc, seed coat; vb, vascular bundle; w, wing.) (From Kaul, V. and Singh, D. 1982.Acta Biologica Cracoviensia 24: 19–30.)2.9.7 TRITICUMThe caryopsis development in Poaceae has been studied for most of the importantgenera. The ovule is bitegmic, the outer multilayered integument disintegrates, andthe inner integument, which is usually two-layered, is either completely lost or the