Download Sieve Elements: Comparative Structure, Induction and by Klaus Schmitz (auth.), Professor Dr. H.-D. Behnke, Professor PDF

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By Klaus Schmitz (auth.), Professor Dr. H.-D. Behnke, Professor Dr. R. D. Sjolund (eds.)

This designated evaluation of the constitution of the sieve components of the key plant teams, from algae to flowering vegetation, contains extant and extinct teams, revealing either universal and divergent suggestions to the matter of long-distance assimilate shipping.

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Fig. 7. Platycerium bifurcatum. Crystalloid-containing nucleus beginning to degenerate. Arrows point to discontinuities in nuclear envelope. x 6400; Bar line= 111m. 8. P. bifurcatum. Crystalloid free in lumen of nearly mature sieve element. x 5000; Bar line= 1 11m (Fig. 3 from Dute and Evert 1978; Fig. 4 from Burr and Evert 1973; Figs. 6 from Kruatrachue and Evert 1974; Figs. 8 from Evert and Eichhorn 1974a) 40 Ray F. 2 Endoplasmic Reticulum During early stages of sieve-element development in seedless vascular plants, the ER is rough-surfaced, mostly cisternal, and fairly uniformly distributed throughout the cytoplasm.

Polytrichum commune leaf. Inner wall layer (/W) of leaf sieve element is invaginated forming wall ingrowths (WI). Outer wall layer (OW) is seen as a distinct, dense layer. x 116900. 6. Polytrichum commune stem. Highly developed stacks of ER in fully mature sieve element. The stacks also show connections with the parietal system of sheets and tubules appressed to the plasmalemma. x 34000 (Fig. 6 from Hebant 1976 a) Mosses 29 also seen on the lateral walls of sieve elements during this stage of differentiation, especially in the leaf (Scheirer 1983).

Late stage of nuclear degeneration in protophloem element. Portions of chromatin (unlabeled arrows) have separated from the main nuclear mass. Remnant of the nuclear envelope (NE) surrounds the major mass of chromatin. A refractive spherule borders the chromatin mass below and to the left. x 11900; Bar line= 111m.. Fig. 4. Selaginella kraussiana. Portion of nucleus with tubulate structure in mature cell. 5Ilm. 5. Isoetes muricata. Nucleus in very young sieve element. x 3850; Bar line= 211m. Fig.

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