The changing shape of plant cells: transformations during cell proliferation.

摘要: Shapes of ideal cells can be inspected for the dynamic, or gnomonic, feature producing daughter same shape. Such features found ( a ) elongating epidermal cells, b isodiametrically enlarging (c) parenchymatous and (< d in three dimensions. Since each cell passes through series changes to finally assume form parental cell, gnomonic must pass sequence shapes during cycle. A model tissue composed gnomoniccells has complete stability subsequent generations. Each six parameters real order evaluate effects deviations from on pattern. (1) Cell plates do not expand one generation. (2) The angles vertices shift over cycles 170- Io 137-3° 124 0°, values close expected set 163°, 133° 120° (3) are perpendicular longitudinal axis cell. (4) Real divide synchronously as cells. (5) equally half (6) Finally, have duration cycle whereas times inversely related initial size It appears that population meristematic adhere restrictions consequently significant amount variance is added at There two compensating mechanisms, hold variation check keep shape under control. Because probabilistic nature division, increase volume various rates while edges all constant rate, indicating latter primary element growth facet area dimension only accommodation.