Comparison of Leaf Plastochron Index and Allometric Analyses of Tooth Development in Arabidopsis thaliana |
| |
Authors: | Edwin P Groot Roger D Meicenheimer |
| |
Institution: | (1) Department of Botany, Miami University, Oxford, Ohio 45056, USA, US |
| |
Abstract: | Abstract
Two methods of analyses were used to investigate tooth development in serrate (se) mutant and wild-type Columbia-1 (Col-1) Arabidopsis thaliana leaves. There were almost twice as many teeth with deeper sinuses and two orders of toothing on the margins of serrate compared with Columbia-1 leaves. The main objective of this study was to test three hypotheses relative to the source of
polymorphism in tooth development: (i) Teeth share similar growth rates and initial sizes, but the deeper teeth are initiated
earlier in leaf development. (ii) Teeth share similar timing of initiation and growth rates, but the deeper teeth have a larger
initial size. (iii) Teeth share similar timing of initiation and initial sizes, but the deeper teeth have a faster growth
rate. Leaf plastochron index (LPI) was used as the time variable for leaf development. Results showed teeth in se were initiated at −27 LPI, 15 plastochrons earlier than those of Col-1. Serrate leaf expansion was biphasic, with the early phase expanding at half the relative plastochron rate of the later phase, which
equaled the constant relative expansion rate of Col-1 leaves. Allometric analyses of tooth development obscured the interactions
between time of tooth and leaf initiation and the early phase of leaf expansion characteristic of serrate leaves and teeth. Timing of developmental events that allometric analysis obscured can be readily detected with the LPI as
a developmental index.
Received 25 January 2000; accepted 17 March 2000 |
| |
Keywords: | : Leaf plastochron index Allometric analysis Tooth development Relative rates of leaf growth Arabidopsis thaliana Serrate Columbia-1 |
本文献已被 PubMed SpringerLink 等数据库收录! |
|