Document Detail


Comparison of Leaf Plastochron Index and Allometric Analyses of Tooth Development in Arabidopsis thaliana.
MedLine Citation:
PMID:  11010994     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Groot; Meicenheimer
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Journal of plant growth regulation     Volume:  19     ISSN:  0721-7595     ISO Abbreviation:  J. Plant Growth Regul.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-09-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9880968     Medline TA:  J Plant Growth Regul     Country:  -    
Other Details:
Languages:  ENG     Pagination:  77-89     Citation Subset:  -    
Affiliation:
Department of Botany, Miami University, Oxford, Ohio 45056, USA
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