Results 221 to 230 of about 99,408 (270)

CALLOSE SUBSTANCE IN SIEVE ELEMENTS

American Journal of Botany, 1964
The secondary phloem of 6 species of woody dicotyledons was examined for the occurrence of callose on the sieve plates of active sieve elements. Fluorescence and bright‐field staining methods were used to detect callose. Tissue from the 6 species was killed and fixed in each of 5 solutions.
Ray F. Evert, William F. Derr
openaire   +1 more source

PHLOEM UNLOADING: Sieve Element Unloading and Post-Sieve Element Transport

Annual Review of Plant Physiology and Plant Molecular Biology, 1997
▪ Abstract  The transport events from the sieve elements to the sites of utilization within the recipient sink cells contribute to phloem unloading. The phenomenon links sink metabolism and/or compartmentation with phloem transport to, and partitioning between, sinks.
openaire   +2 more sources

Sieve–element characters

Nordic Journal of Botany, 1981
Of all the ultrastructural features recognized within sieve elements their specific plastids provide the most successful characters in seed plant systematics. Sieve–element plastids are classified into subtypes and forms according to their protein and starch contents. Presently 26 different forms grouped into six subtypes within the two basic types (S–
openaire   +1 more source

Sieve element pores in Nicotiana pith culture

Journal of Ultrastructure Research, 1970
Sieve elements were induced to form in cultured pith cylinders of Nicotiana tabacum L. (var. Wisconsin 38). Both xylem and phloem differentiate in isolated nodules at the periphery of the cylinders. The mature sieve elements closely resemble sieve elements in intact plants but are more irregular in shape and usually not highly elongated.
R, Anderson, J, Cronshaw
openaire   +2 more sources

Lignified sieve elements in the wheat leaf

Planta, 1974
Sieve elements with thick, lignified walls are identified in the longitudinal bundles of the wheat leaf and appear to be functional. They are also present in several festucoid grasses but appear to be absent from the panicoid grasses examined.
J, Kuo, T P, O'Brien
openaire   +2 more sources

Removing the nucleus in sieve elements

Science, 2014
Cellular remodeling to develop phloem cells orchestrates degradation of the cell’s nucleus.
openaire   +1 more source

Sieve Elements of Graft Unions

1990
In grafted plants the various relations between scion and stock are based on exchange of heterogeneous substances between the partners; many of them being organic compounds which are translocated in the symplast (see reviews by Brabec 1965 and Carr 1976).
Rainer Kollmann, Christl Glockmann
openaire   +1 more source

Endoplasmic reticulum in the sieve element of Cucurbita

Journal of Ultrastructure Research, 1968
The endoplasmic reticulum (ER) in immature sieve elements of Cucurbita maxima Duchesne resembles that of other types of nucleate cells in morphology and distribution. In mature sieve elements the ER assumes two forms. One of these is represented by a network closely applied to the plasma membrane lining the cell wall.
K, Esau, J, Cronshaw
openaire   +2 more sources

Sieve element plastids in bamboo

Experientia, 1978
The fine structure of the sieve element plastids ofBambusa vulgaris andSchizostachyum lumampao revealed the typical monocotyledonous type (P-type) with the cuneate proteinaceous bodies and lattice-like crystalloids; in addition, characteristically formed vesicles and tubulae could be observed. The diagnostic value of these plastids is also discussed.
openaire   +1 more source

A reevaluation of extruded nucleoli in sieve elements

Journal of Ultrastructure Research, 1970
Immature and mature sieve elements of Populus deltoides, Quercus alba, Salix nigra, Tilia americana, and Rhus glabra were examined with light and electron microscopes. Sieve elements of the first four species contain persistent spherical inclusions similar to those heretofore interpreted as extruded nucleoli.
B P, Deshpande, R F, Evert
openaire   +2 more sources