Cell‐lineage Studies in Root Meristems by Means of Chromosome Rearrangements Induced by X‐rays

Brumfield, Robert T.

doi:10.1002/j.1537-2197.1943.tb14737.x

Cited by 40 publications

(5 citation statements)

References 17 publications

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“…Esau (1943) described the roots of Pyrus as being similar in this respect, but interpreted this as meaning that the root-cap was derived from the cortex. This view was once held to be generally true, though it is contrary to Hanstein's histogen theory, and it is supported by Brumfield's (1943) explanation of his X-ray-induced sectorial chimaeras in Vicia and Crepis roots. But the analysis of cell complexes in Fagus roots gives no support to the view whatsoever, for even where the Korper-Kappe boundary is in the middle cortex the outer periblem complex is independent of the epidermis-root-cap complex in ontogeny.…”

Section: Discussionmentioning

confidence: 68%

ROOT APICAL MERISTEMS OF FAGUS SYLVATICA

Clowes

1950

New Phytologist

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Section: Discussionmentioning

confidence: 68%

ROOT APICAL MERISTEMS OF FAGUS SYLVATICA

Clowes

1950

New Phytologist

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“…and in many other species from a range of families where the initials change from the tiered to the untiered state in older roots (von Guttenberg, 1947(von Guttenberg, , 1964Armstrong and Heimsch, 1976). Since it has not been possible to obtain stable periclinal chimeras in roots because lateral roots are generally derived from one tissue layer (pericycle) and not all three (L1, L2 and L3) as in shoots, there has been no illustration of the functional tiered organisation of the root meristem by clonal analysis, as there has been in the shoot meristem (Satina et al, 1940;Brumfield, 1943).…”

Section: Introductionmentioning

confidence: 99%

Cellular organisation of the Arabidopsis thaliana root

et al. 1993

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The anatomy of the developing root of Arabidopsis is described using conventional histological techniques, scanning and transmission electron microscopy. The root meristem is derived from cells of the hypophysis and adjacent cells of the embryo proper. The postembryonic organization of the root is apparent in the mature embryo and is maintained in the growing primary root after germination. Cell number and location is relatively invariant in the primary root, with 8 cortical and endodermal cell files but more variable numbers of pericycle and epidermal cells. The organisation of cells in lateral roots is similar to that of the primary root but with more variability in the numbers of cell files in each layer. [3H]thymidine labeling of actively growing roots indicates that a quiescent centre of four central cells (derived from the hypophysis) is located between the root cap columella and the stele. This plate of four cells is surrounded by three groups of cells in, proximal, distal and lateral positions. The labeling patterns of these cells suggest that they are the initials for the files of cells that comprise the root. They give rise to four sets of cell files: the stele, the cortex and endodermis, the epidermis and lateral root-cap and the columella. A model of meristem activity is proposed based on these data. This description of Arabidopsis root structure underpins future work on the developmental genetics of root morphogenesis.

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“…Cytological methods have been used by a few workers (e .g. BRUMFIELD (1943) in Crepis, CALDECOTT and SMITH (1952) in barley, PRASAD and GODWARD (1969) in Phalaris) . ANDERSON et al .…”

Section: Methodsmentioning

confidence: 99%

“…1949, BLIXT et al . 1960, BRUMFIELD 1943, CALDECOTT and SMITH 1952, GAUL 1959, PRASAD and GODWARD 1969 . These studies reveal that the species differ in the number of initial cells present in the shoot meristem .…”

Section: Introductionmentioning

confidence: 99%

Radiation and genetical studies to estimate the number of embryonic initials taking part in the formation of the shoot meristem of Vicia ervilia and Lathyrus sativus

Shaikh

Godward

1971

Euphytica

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Dry seeds of V. ervilia and L . sativus were irradiated with 60Co gamma rays . The M, plants were grown to maturity . During harvest, ten randomly selected plants were arbitrarily numbered (symbols P 1 to P 10) and the branches and the pod positions along each branch of each plant were numbered (symbols for branches, B 1 to B 4 and pod positions, pl to p 1 ) from the lowest to the topmost one . The seeds of each pod position were collected, threshed, counted and, the next year, sown separately . Mutants were isolated from among the M 2 population and each mutant could be traced back to the particular topography of the M 1 plant . The seeds from the M 2 plants originating from different sectors of the M 1 plants were grown to M 3 generation to study the pattern of inheritance . The segregation data of Ls sativus show that in some cases at least one and in other cases at least two embryonic initials were involved in the formation of the shoot meristem whereas in V, ervilia the number of embryonic initials involved was at least two or three .

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Cell‐lineage Studies in Root Meristems by Means of Chromosome Rearrangements Induced by X‐rays

Cited by 40 publications

References 17 publications

ROOT APICAL MERISTEMS OF FAGUS SYLVATICA

ROOT APICAL MERISTEMS OF FAGUS SYLVATICA

Cellular organisation of the Arabidopsis thaliana root

Radiation and genetical studies to estimate the number of embryonic initials taking part in the formation of the shoot meristem of Vicia ervilia and Lathyrus sativus

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