Mitotic activity and cell elongation in geostimulated roots of Zea mays

Autor: R.-M. Hofer, Peter W. Barlow
Rok vydání: 1982
Předmět:
Zdroj: Physiologia Plantarum. 54:137-141
ISSN: 1399-3054
0031-9317
DOI: 10.1111/j.1399-3054.1982.tb06316.x
Popis: Mitotic activity was investigated in the primary meristem of horizontally oriented excised root tips of Zea mays during the first six hours of their georeaction. The only statistically significant change that could be detected in the meristem was a decrease of the length of its upper half. No significant difference in mitotic activity was found between the upper and lower halves of roots kept continuously horizontal for 6 h. Cell proliferation thus seems relatively insensitive to changes in the redistribution of endogenous growth regulators that are believed to occur within the meristem during the onset of geotropism. In the zone of bending proximal to the meristem cell length was significantly greater in the upper half than in either the lower half or in the equivalent position in vertical control roots. Thus, cell elongation seems to be promoted in the upper half of the horizontal root. Thus, The differences in cell length were not accompanied by any change in the proportion of nuclei synthesising DNA in these elongating, non-meristematic cells.
Databáze: OpenAIRE
Externí odkaz: