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

36 Histopathology of Seed-Borne Infectionse e′′e′epsoiAiiBhse′ izCeps sg hs sclaereps sgDhs scl aer chle e′′ e′EGoi ii nuFe′sgHFIGURE 2.15 Development and structure of seed coat in Cucurbita and Sechium. A to C,C. pepo; D, E, C. moschata. A, Ls part of integuments. B, Outer region of outer integumentshowing periclinal divisions in the epidermis to form e, e≤, and e¢ layers. C, D, Ls part ofdeveloping seed coat showing radial elongation of epidermal cells and tangential elongationand initiation of thickenings in e, sclerenchymatous layer. E, Ts part of mature seed coat. Fto H, S. edule. F, Ls part of integuments. G, Outer region of outer integument showingpericlinal divisions in epidermis. H, Ts part of seed coat; cells possess starch grains but lacklignification. (Abbreviations: aer, aerenchyma; chl, chlorenchyma; e, e¢, and e≤, derivativesof ovular epidermis from outside to inside; eps, seed epidermis; hs, seed hypodermis; ii, innerintegument; iz, inner zone of parenchyma cells; nu, nucellus; oi, outer integument; scl,sclerenchymatous layer; sg, starch grains.) (A to E, From Singh, D. and Dathan, A.S.R. 1972.Phytomorphology 46: 277–281; F to H, From Singh, D. 1965. Curr. Sci. 34: 696–697.)