Plant and Cell Physiology Supplement
Abstract of the Annual Meeting of JSPP 2011
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Influence of low temperatures upon pollen development in Arabidopsis thaliana
*Nao YagihashiTadashi SakataShusei SatoAtsushi Higashitani
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Pages 0040

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Abstract
Reproductive stage of plant development is much more sensitive to various abiotic stresses than the vegetative stage. For this reason, changes in climate can cause abortion of plant reproductive development. In particular, the phase of pollen development is most susceptible to temperature fluctuation.In this presentation, we introduce the influence of low temperature upon the response to phytohormones and the cell proliferation in the inflorescence of Arabidopsis. In a recombinant line DR5-GUS, the anther signals at stage 10 were obviously repressed by increasing temperature. On the other hand, the signals oppositely increased by mild cold stress at 10-13C for 24h or more. We also analyzed the expression of cell cycle regulators, Cyclin, CycA and CycB genes. The strong expression of early floral buds prior to stage 8 was significantly repressed by the similar cold stress. These results indicate that the temporal and spatial expressions of phytohormone-response genes and cell cycle related genes were dynamically altered in reproductive cells by temperature fluctuation. In addition, we would like to discuss whether these responses are conserved in the low-temperature injury of rice.
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© 2011 by The Japanese Society of Plant Physiologists
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