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Contribution to the Anatomy of the Fruit of Peach. II. Crax and Wax Formation in Cell Walls of Epicarps
D. Miličić
; Hrvatska
Sažetak
The outer epidermis of epicarp of Nectarine (Prunus per cica var. nucipersica C. K. Schneider) in the outer cell-walls below the cuticle contains cuticular laiyers of considerable thickness, and in the lateral walls well developed cuticular ribs (fig. 1). Because of considerable tension in epicarp of developed fruits the cutinised parts of the epidermal walls break up on many places. Two main forms of cracks are produced: the outer cracks (fig. 2f. and 3a) are produced because of the break of cuticle and cuticular layers and that is why they are open and ithe other, inner cracks (fig. lg, 2 d and 5c), are caused only by the break of cuticular ribs, and that is why they are closed in the inner of cell-walls.
When the cracks are produced, they do not extend to a greater degree on the neighbouring uncut inised membrane parts which are characterised by considerable extensibility, so that protoplast of the epidermic cells remain everywhere wrapped by membrane and preserve, at least in most cases, their ability of fulfilling their vital functions.
The inner and outer cracks can be filled up with wax. Wax inclusions are frequent especially in inner crack, which are caused by transversal rupture of cuticular rihs (fig. lg, 2e and 5c). Those inclusions have a characteristic structure. It seems that they are built by rod-shaped elements, which are mostly laid paralelly with the surface of fruit and paralelly with the direction in which the cuticular ribs are settled (fig. 1, 4b and 5c).
Wax inclusions are optically anisotropic (Tab. I, fig. 3 and 4) and shine in polarised light between the crossed Nicols in many positions. The birefringence of the inclusions is negative. This negative birefringence disappear with rise of temperature, but it reappers on cooling.
Ključne riječi
Hrčak ID:
152644
URI
Datum izdavanja:
31.12.1956.
Posjeta: 1.050 *