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Study On Phenotypic Selection And Adaptive Plasticity Of Arabidopsis Thaliana

Posted on:2005-04-22Degree:DoctorType:Dissertation
Country:ChinaCandidate:T LiuFull Text:PDF
GTID:1100360122996179Subject:Botany
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Phenotypic adaptation and Phenotypic evolution were key foundation to evolutionary botany, which were necessary to combined ecology, evolution with molecular biology. In order to uncover the evolutionary mechanism of plasticity and adaptation of A. thaliana, following research were made.1. Results were found the evidence of divergence differentiation of three populations came from various habitants under drought stress, one material was from American(Col-O) and others were from china where was the origin central of A. thaliana in the world. These further proved natural selection was main impetus to the evolution of A. thaliana. It might relieve the drought stress by the means of mutual interaction among the morphology, physiology and development traits. Methodology emphasized particularly on adaptation of morphology should be reformed.2. System compare combined populations of A. pumila, which is the phylogenetic related species of A. thaliana, discovered that rosette leaf played key role in reproductive success under drought stress and there was a trade-off between rosette leaf and stem leaf. Analysis of phylogenetically corrected correlation confirmed trait mean was different from trait plasticity, which evolved quite rapidly in short time and had different ecological implication.3. The study of phenotypic adaptation in vitro was main direction to reveal the mechanism of plasticity. Results were found that phenotype of A. thaliana might change following different contents and concentration of ions in medium. Phenotypic integration and development of seedling in nature were different from in vitro, which indicated phenotypic integration not only was changed following environment, but also condition of developing seedling. Excessive concentration of 6BA(6 - kinetin) reduced ability of self-regulated and adaptation of seedling. Because plasticity was under the control of independent genetic system and evolved quickly in short time, and developmental traits of seedling in-vitro was influenced by mineral elements, mechanism and methodology of phenotype plasticity of plant micropropagation were discussed. To out surprise, seedling rooting came out prospective when the prediction was tested on micropropagation of pear(Pyrus sinkiangensis Yu), which was famous fruit in north China.This item was established on the base of key problems of phenotypic adaptation and plasticity evolution, assimilating the latest outcome and methodology of related studies, phenotypic evolution of A. thaliana was studied deeply and the relationship of populations from china and American was connected. There were many methodological innovation on study of the evolutionary mechanism of plasticity and applicative study of phenotypic plasticity was submitted primarily. This paper enriched study of phenotypic plasticity in the world.
Keywords/Search Tags:Arabidopsis thaliana, A. pumila, adaptation, natural selection, phenotypic plasticity, micropropagated mechanism
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