Structure of the Apical Meristem and Development of the Foliage Leaves of Cunninghamia Lanceolata

Cross, G. L.

doi:10.1002/j.1537-2197.1942.tb14009.x

Cited by 45 publications

(19 citation statements)

References 7 publications

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“…5 and 6). This is comparable to the condition reported in Taxodiaceae (Cross, 1939(Cross, , 1941(Cross, , 1942 and Araucaria (Griffith, 1952;Pillai, 1963^1), and is in contrast to the condition reported in Abies, Picea and Pinus (Korody, 1937) and Podocarpus (Pillai, 1963a), where perichnal divisions may occur in any cell of the surface layer. Hence, this layer can be considered as a protoderm ' ... since the surface layer augments itself by anticlinal divisions only and produces epidermal tissues of the shoot, it may be regarded as a protoderm' (Al Sheriff, 1952).…”

Section: Zonation Of the Apexsupporting

confidence: 78%

“…Consequently, highly vacuolated pith cells occur high up in the apical cone. Such an abrupt change of pith mother cells into mature pith cells has been reported in Biota, Chamaecyparis, Juniperis and Cupressus macrocarpa (Al Sherifi, 1952), Taxodiaceae (Cross, 1939(Cross, , 1941 and Libocedrtts (Jackman,i960). Johnson (1951) states that this condition is widespread in Coniferophyta, especially in the Taxodiaceae and Cupressaceae.…”

Section: Zone 4 the Pith Mother Cellsmentioning

confidence: 60%

“…Thus they form the ultimate source of all the cells of the apex. The investigations of Cross (1939Cross ( , 1940Cross ( , 1941Cross ( , 1942 on Taxodiaceae and Al Sherifi (1952) on Cupressaceae lend support to these observations. Here the flanks of the superficial zone can be considered as a discrete 'protoderm', according to Strasburger's (1872) earlier description, though it will be more appropriate to consider it as representing a significant stage in the evolution of a tunica.…”

Section: Discussionmentioning

confidence: 80%

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STRUCTURE AND SEASONAL STUDY OF THE SHOOT APEX OF SOME CUPRESSUS SPECIES

Pillai

1963

New Phytologist

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Summary The shoot apices of three species of Cupressus exhibit four zones; the superficial layer, the sub‐apical initials, pith mother cells, and the flanking zone. The superficial layer can be subdivided into the apical initials which contribute by periclinal divisions to the subapical initials below and by anticlinal ones to the surface layer on the flanks. Thus the apical initials form the ultimate source of all the cells of the shoot apex in these species. The subapical initials are composed of a very limited number of cells, and may even be only one cell deep in some apices. The initials give rise to the flanking zone laterally and pith mother cells proximally. The flanking zone exhibits a stratified pattern and is composed of more or less uniform and densely staining cells. The pith mother cells form a very shallow zone. A pith rib‐meristem is absent and the cells mature abruptly into pith cells. During the less active months the apical initials do not exhibit periclinal divisions and hence appear like a tunica. But there is no period of dormancy in the shoot apex of C. sempervirens, of which a seasonal study was made.

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Section: Zonation Of the Apexsupporting

confidence: 78%

Section: Zone 4 the Pith Mother Cellsmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 80%

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STRUCTURE AND SEASONAL STUDY OF THE SHOOT APEX OF SOME CUPRESSUS SPECIES

Pillai

1963

New Phytologist

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“…In the earlier descriptions (De Bary, 1884;Feustel, 1921;Ziegenspeck, 1929;Cross, 1942;Esau, 1960Esau, , 1965 the transfusion tissue in the leaves of Cunninghamia was described as occurring only lateral to the midrib, in the form of two extended wings. It appears that the occurrence of parenchyma in few layers on the adaxial and abaxial sides of the vascular bundle was not taken into account as a part of the transfusion system, although its position and nature clearly indicate that it is part of the system in question.…”

Section: Discussionmentioning

confidence: 99%

“…The omission of these cells from the earlier descriptions was obviously, as pointed out by Lederer (1955), due rather to the general tendency to ignore such elements than to their absence. In fact, Cross (1942) had observed the occurrence of transfusion tissue at places other than the flanks, at least at locations adaxial to the xylem. But he did not interpret it as such, merely indicating that it formed the outer limit of the xylem.…”

Section: Discussionmentioning

confidence: 99%

Transfusion tissue in the leaves of Cunninghamia lanceolata (Lambert) Hooker (Taxodiaceae)

Ghouse

Yunus

1974

Botanical Journal of the Linnean Society

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The structure and distribution of transfusion tissue in the leaves of Cunninghamia lanceolata has been studied. It is made up of tracheids, albuminous cells and parenchyma. The tracheids occur to the right and left of the vascular bundle, while the albuminous cells are lateral to the phloem and the parenchyma is principally in the adaxial and abaxial positions. The transfusion tissue, therefore, appears to be distributed all round the vascular bundle and not only lateral to it as was reported in the earlier descriptions.

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Structure and Growth of the Vegetative Shoot Apex of Garrya Elliptica Dougl

Reeve

1942

American J of Botany

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Structure of the Apical Meristem and Development of the Foliage Leaves of Cunninghamia Lanceolata

Cited by 45 publications

References 7 publications

STRUCTURE AND SEASONAL STUDY OF THE SHOOT APEX OF SOME CUPRESSUS SPECIES

STRUCTURE AND SEASONAL STUDY OF THE SHOOT APEX OF SOME CUPRESSUS SPECIES

Transfusion tissue in the leaves of Cunninghamia lanceolata (Lambert) Hooker (Taxodiaceae)

Structure and Growth of the Vegetative Shoot Apex of Garrya Elliptica Dougl

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