The nucleic acid content of cells in the meristematic elongating and fully elongated segments of roots of Vicia faba

Holmes, Barbara E.; Mee, Lorna K.; Hornsey, Shirley; Gray, L. H.

doi:10.1016/0014-4827(55)90046-x

Cited by 54 publications

(7 citation statements)

References 5 publications

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“…However, although the rate of cell expansion was probably unaffected by iron deficiency, the maximum volume attained was lower In both treatments there was negligible increase in cell size in tissue more than lo mm from the apex. The location of the region of cell expansion was similar to that found in bean and maize roots (Erickson and Goddard, 1951;Holmes et al, 1955;Woodstock and Skoog, 1962), Brown and Possingham (1957) showed a steady increase in cell volume over the apical 60 mm m pea roots. In addition, these authors found a three-fold increase m the number of cells per 10 mm section in the region 20-60 mm from the root apex.…”

Section: Discussionsupporting

confidence: 74%

Changes in Growth and Metabolism of Excised Pea Roots Associated With Iron Deficiency

Abbott

1968

New Phytologist

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The effects of iron deficiency on the growth and metabolism of isolated pea roots grown in sterile culture have been analysed. Changes were followed in whole routs sampled at intervals and in successive sections of roots sampled at a critical stage of deficiency. Transfer of deficient roots to complete nutrient after varying periods in the absence of iron showed the growth restriction was reversible for at least 6 days. Results suggest that the complete cessation of cell division after 6 days in iron-deficient culture was due primarily to a disturbance localized in the apical meristematic cells. Changes which occurred in the levels of protein nitrogen, ethanol-soluble nitrogen, amino acids, soluble carbohydrates and respiration are mainly attributed to the cessation of cell division rather than the cause of it. The rate of cell expansion w as unaffected by iron deficiency but the final size of mature cells was reduced. Addition of iron to deficient roots stimulated cell division more rapidly than protein synthesis or respiration rate. Insofar as the serial-seetioning technique used enabled separation to be made of cell di\ ision and cell enlargement, the results suggest that the effect of iron deficiency is confined primarily t(j the former. In addition, the final phase of cell maturation may also be affected but the evidence was inconclusive and these effects may not be determined directly by depletion of the iron supply. Evidence is presented showing that the metabolic changes associated with the transition from cell division through cell expansion to cell maturation depend on the source of root inocula used. Seedling roots showed marked changes in metabolism and meristem size when first isolated due to the depletion of metabolites translocated from the germinated seed, and it was necessary to use inocula taken from cultured excised roots to provide valid data on the changes due to increasing cell age.

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Section: Discussionsupporting

confidence: 74%

Changes in Growth and Metabolism of Excised Pea Roots Associated With Iron Deficiency

Abbott

1968

New Phytologist

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“…The first 2 or 3 mm. are customarily assumed (Baldovinos, 1953;Brown et al, 1952;Holmes et al, 1955) to be composed of meristematic cells which in more basal areas elongate and cease dividing. This interpretation was modified by Jensen (1955a) who recognized a stage of radial enlargement between a general meristem and the beginning of elongation.…”

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confidence: 99%

An Analysis of Cell Morphology and the Periodicity of Division in the Root Tip of Allium Cepa

Jensen

Kavaljian

1958

American J of Botany

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“…The levels of TCA-insoluble phosphorus were of the same magnitude, 0.11 mg/gm fresh wt for the 10 to 20 mm root regions, compared to the DNAP plus RNAP of Vicia faba roots, 0.13 mg/gm fresh wt for the 12 to 20 mm root regions (12). These regions in Vicia faba and barley are presumably in the fully elongated cell region and thus presumably comparable with respect to physiological age.…”

mentioning

confidence: 76%

“…These regions in Vicia faba and barley are presumably in the fully elongated cell region and thus presumably comparable with respect to physiological age. The relative proportions of RNAP to DNAP were roughly constant (4 :1) in the various root regions of Vicia faba (12). By analogy in the barley the correlation between respiration rate and TCA-insoluble phosphate may not be influenced by phosphorus in the nuclei.…”

mentioning

confidence: 83%

The Salt Respiration and Phosphate Contents of Barley Roots.

Honda¹

1956

Plant Physiol.

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The nucleic acid content of cells in the meristematic elongating and fully elongated segments of roots of Vicia faba

Cited by 54 publications

References 5 publications

Changes in Growth and Metabolism of Excised Pea Roots Associated With Iron Deficiency

Changes in Growth and Metabolism of Excised Pea Roots Associated With Iron Deficiency

An Analysis of Cell Morphology and the Periodicity of Division in the Root Tip of Allium Cepa

The Salt Respiration and Phosphate Contents of Barley Roots.

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