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- Title
REGENERATION RESPONSES IN PEA ROOTS AFTER TIP EXCISION AT DIFFERENT LEVELS.
- Authors
Reihman, Mary Ann; Rost, Thomas L.
- Abstract
Root tips of Pisum sativum cv Alaska were excised at seven excision distances ranging from 250 to 5,000 μm from the root cap/body junction. Three response types resulted: 1) Type A— One to three regenerated apices grew in the same plane as the root axis; 2) Type B—One to three regenerates emerged either longitudinally from a swollen wound site or at angles >90“° from the root longitudinal axis; 3) Type C—One to three lateral roots emerged at 90° from the root axis. The response type was dependent on the excision distance: Type A response resulted after excisions of 250 and 500 μm, Type B after excisions of 1,000 and 1,500 μm, and Type C after excisions of > 1,500 μm. The vascular patterns of the regenerated roots varied with excision distance. Most regenerates resulting after being excised at 250 μm exhibited variations in xylem strand number. Most of those resulting after being excised at 500 μm were ”polystelic“ and few of these showed variation in xylem strand number. With increasing excision distance the number of regenerates with variation in xylem stand number or with a ”polystelic“ condition decreased. Both the type of regeneration response and the vascular patterns within the regenerates correlated with the state of differentiation of cells at each excision distance.
- Publication
American Journal of Botany, 1990, Vol 77, Issue 9, p1159
- ISSN
0002-9122
- Publication type
Article
- DOI
10.1002/j.1537-2197.1990.tb13614.x