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Responses Of Sexual Reproduction Pattern And Leaf Traits Of Arabidopsis Thaliana To Elevated CO2

Posted on:2007-09-29Degree:DoctorType:Dissertation
Country:ChinaCandidate:N J TengFull Text:PDF
Abstract/Summary:PDF Full Text Request
Atmospheric CO2 concentration is expected to rise from current levels of about 370ppm to between 540 and 970ppm by the end of this century and the effects of rising atmospheric CO2 concentrations on the global climate have attracted considerable attention. Because CO2 is one of raw materials of plant photosynthesis, thus plant growth responds both physiologically and anatomically to elevated CO2. So far, a great number of studies have investigated plant responses to elevated CO2 at different scales ranging from ecosystem, community, population, plant, organ, tissue, physiological, biochemical to molecular levels, nevertheless few studies have focused on the effects of elevated CO2 on plant reproductive characteristics and nearly no studies have reported the effects of long-term CO2 on plant reproductive characteristics. It has been accepted that plant reproductive characteristics are key traits for predicting the response of communities and ecosystems to global change and are also closely related to its ecological fitness and production of crops. Furthermore, investigation on the long-term response of plant to elevated CO2 under a completely man-controlled environment can increase our capacity to predict the properties of populations adapted to rising atmospheric CO2 in the near future. Therefore, it is essential to carry out CO2 selection experiments to investigate effects of long-term CO2 on plant reproduction and adaptation of plant reproduction to elevated CO2.In the present study, Arabidopsis thaliana, a model plant widely used in molecular, genetic, and developmental biology, was continously grown under both elevated (700ppm) and ambient (370ppm) CO2 for eight generations. The changes in various reproductive characteristics of an individual generation were determined and their overall changes in eight generations were further invstigated. In addition, the changes in physiological, biochemical, and cytological traits of leaves of Arabidopsis grown udner both elevated and ambient CO2 condition were compared. The main results and conclusions in this paper are listed as follows:Within an individual generation, elevated CO2 advanced the flowering time of Arabidopsis through increasing relative growth rate and accelerating developmental process, and resulted in more flowers, more fruits, more seeds, more mass allocated...
Keywords/Search Tags:Arabidopsis thaliana, elevated CO2, leaf ultrastructure, mineral nutrition, plant adaptation, plant hormones, sexual reproduction, transpiration rate
PDF Full Text Request
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