A Comparative Study of Vegetative Shoot Apices in the Rosaceae

Rouffa, Albert S.; Gunckel, James E.

doi:10.1002/j.1537-2197.1951.tb14825.x

Cited by 22 publications

(8 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Plujsocarpus, however, only the two layers of the tunica extend above the point of attachment of the youngest leaf primordium, and in Poteniilla the tip of the apical meristem and the point at which the youngest leaf is attached are at the same level. A similar condition has been described by Rouffa and Gunckel (1951a) in the members of the Rosaceae which they studied and also in other dicotyledons by Reeve (1948). Therefore, in such cases, the apical meristem has to be delimited on the basis of the alignment and cytohistologic characteristics of its cells.…”

supporting

confidence: 63%

Development and Morphology of Stelar Components in the Stems of Some Members of the Leguminosae and Rosaceae

Devadas

Beck

1971

American J of Botany

View full text Add to dashboard Cite

Two species of Leguminosae and five species of Rosaceae have been studied in an attempt to determine the relationship between the development of primary vascular bundles and their morphology, and the variation in morphology among vascular bundles of different types in the stem. A residual meristem occurs in all species. The direction of differentiation of provascular tissue and primary phloem is acropetal and continuous, but differentiation of primary xylem is usually basipetal in the stem. Rare acropetal differentiation of primary xylem was observed in two species only, and in these it is restricted to axial bundles. In order to identify the different types of vascular bundles and to understand their relationship to each other and to the organs they supply, the architecture of the primary vascular system was determined. The several types of vascular bundles are highly variable in size and tracheary cell content. Of all the vascular bundles, the leaf traces are the largest and contain the greatest number of files of tracheary elements. Whereas leaf traces gradually increase in size from the levels of their divergence from axial bundles to the levels at which they enter leaf bases, axial bundles maintain a size in approximate proportion to the diameter of the vascular cylinder. Branch traces decrease in size acropetally. In axial bundles there are usually only one or two files of tracheary elements in contrast to as many as nine files in the median leaf traces of some species. In apical regions where the axial bundles are the sole means of continuous longitudinal transport in the stem, effective water and mineral conduction occur through a relatively small number of tracheary elements. In leaf traces, the much larger number of tracheary elements may have, among other functions, adaptive value in compartmentalization of transport.

show abstract

supporting

confidence: 63%

Development and Morphology of Stelar Components in the Stems of Some Members of the Leguminosae and Rosaceae

Devadas

Beck

1971

American J of Botany

View full text Add to dashboard Cite

show abstract

“…Thus, in the first part of this paper (Rouffa and Gunckel, 1951) seasonal changes were noted in the configuration of the pith rib meristem, Further, there are differences in the length of time during which the shoot apices of different species of the Rosaceae are active, and this activity is paralleled by developmental changes taking place in the apical derivatives, changes which can be correlated with growth habit. Thus, in the first part of this paper (Rouffa and Gunckel, 1951) seasonal changes were noted in the configuration of the pith rib meristem, Further, there are differences in the length of time during which the shoot apices of different species of the Rosaceae are active, and this activity is paralleled by developmental changes taking place in the apical derivatives, changes which can be correlated with growth habit.…”

mentioning

confidence: 80%

“…The pattern of development of the pith rib meristem and its derivatives is important since it may be correlated with growth and development. Thus, in the first part of this paper (Rouffa and Gunckel, 1951) seasonal changes were noted in the configuration of the pith rib meristem, Further, there are differences in the length of time during which the shoot apices of different species of the Rosaceae are active, and this activity is paralleled by developmental changes taking place in the apical derivatives, changes which can be correlated with growth habit. Therefore, the pith rib meristem is considered under pith development as well as in the discussion of the apical meristem since the behavior of the rib meristem and its derivatives and the relation of their activity to the pattern of growth and seasonal change in the pith can then logically be considered as a continuous process rather than as two distinct developmental processes.…”

mentioning

confidence: 80%

Leaf Initiation, Origin, and Pattern of Pith Development in the Rosaceae

Rouffa

Gunckel

1951

American J of Botany

Self Cite

View full text Add to dashboard Cite

“…Furthermore, as Gifford (1954) emphasized in his critical review of the shoot apex in angiosperms, there is need for more extensive studies in large groups of related plants. Reeve (1948) studied several representatives of the Amentiferae; Gifford (1950) dealt with certain members of the Ranales; Rouffa and Gunckel (1951) investigated 54 species in the Rosaceae; and Hara (l958) reported on the family Ericaceae and some related genera. Smith (1963) reported on 42 species of the family Moraceae, all but two of which were tree species.…”

mentioning

confidence: 99%

“…Smith (1963) reported on 42 species of the family Moraceae, all but two of which were tree species. The Rosaceae (Rouffa and Gunckel, 1951) includes trees, shrubs, and herbs. Likewise, the family Malvaceae includes trees, shrubs, and herbs, with each growth habit represented in this survey.…”

mentioning

confidence: 99%

A Survey of the Vegetative Shoot Apices in the Family Malvaceae

Tolbert

Johnson

1966

American J of Botany

View full text Add to dashboard Cite

The present study compares the structure of the vegetative shoot apex in 40 species of the Malvaceae. There is a wide range of size, shape, and zonation within the apices of the family. Although many of the apices are domed, some are flat‐topped and do not extend above the axil of the youngest leaf primordium. Also, most of the species investigated are recorded as having a more or less marked cytohistological zonation superimposed on the tunica‐corpus configuration. The tunica is single‐layered in a majority of species, but stratification of the upper corpus is common. In an effort to give a more accurate concept of apical structure and activity, the apex is described as the metrameristem and its derivatives: the flanking meristem, and the pith rib meristem or pith mother cells. The metrameristem, consisting of the tunica initials and the co pus initials, is the focal point of the study of the zoned apices. Data are presented for the measurements of the metrameristem, measurements of the apical dome, type of flanking meristem, origin of the pith, and growth habit of the plant. There appears to be a correlation between growth habit and the distinctness with which the metrameristem is marked off from the surrounding tissue. Most of the herbaceous species have an indistinctly marked metrameristem, whereas the shrubby trees and trees have a distinctly marked metrameristem. Zonation in shrubs and suffrutescent plants may be of either type.

show abstract

A Comparative Study of Vegetative Shoot Apices in the Rosaceae

Cited by 22 publications

References 34 publications

Development and Morphology of Stelar Components in the Stems of Some Members of the Leguminosae and Rosaceae

Development and Morphology of Stelar Components in the Stems of Some Members of the Leguminosae and Rosaceae

Leaf Initiation, Origin, and Pattern of Pith Development in the Rosaceae

A Survey of the Vegetative Shoot Apices in the Family Malvaceae

Contact Info

Product

Resources

About