Mechanisms of reorganization and cell repopulation in meristems in roots of Vicia faba following irradiation and colchicine

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Chromosoma

DOI:https://doi.org/10.1007/BF00328940· OSTI ID:4802876

Davidson, D.

The treatment of Vicia roots with 600 r, 300 r plus colchicine, or colchicine alone resulted in a complete, though temporary, inhibition of root growth. Mitoses were seen 2 to 10 days after x irradiation or colchicine treatment. This indtcates that cell dtviston does occur in roots whose growth tn length has been temporarily inhibited. It is estimated, from the relative frequencies of cells wlth atypical chromosome complements, that the primordium is composed of 40 to 50 cells. The roots were found to recover from the effects of colchicine in about l0 days. In the first part of the period, polyploid cells were frequent in the meristem but they later decreased in frequency. In lateral roots developing from the C-tumor, polyploid cells were still present in high frequency at a time when they were infrequent in the primary root. It is suggested that the size of the primordium is important for regeneration; the new growth is attributed to the stimulation of elongation in cells basal to the primordium by auxin secreted by the cells of the primordium. It is further suggested that the apical cells of the growing root also synthesize growth simulants. The data support several hypotheses.

• Research Organization: Oak Ridge National Lab., Tenn.
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-007432
• OSTI ID: 4802876
• Journal Information: Chromosoma, Journal Name: Chromosoma Journal Issue: 1 Vol. 12; ISSN 0009-5915
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
ALKALOIDS
AUXINS
CHROMOSOMES
COLCHICINE
CYTOLOGY
DRUGS
HORMONES
MITOSIS
ORGANIC ACIDS
PLANT CELLS
PLANTS
RADIATION DOSES
RADIATION EFFECTS
REGENERATION
ROOTS
X RADIATION