Activities of auxin polar transport in inflorescence axes of flower mutants ofArabidopsis thaliana: Relevance to flower formation and growth |
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Authors: | Mariko Oka Junichi Ueda Kensuke Miyamoto Kiyotaka Okada |
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Institution: | (1) College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, 599-8531 Sakai Osaka, Japan;(2) Faculty of Science, Kyoto University, 606-8502 Kyoto, Japan;(3) Present address: Research Institute for Biological Sciences Okayama, 7549-1 Yoshikawa, Kayo-cho, Joubo-gun, 716-1241 Okayama, Japan |
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Abstract: | Relationships between the activity of auxin polar transport and flower formation were studied using several flower mutants
ofArabidopsis thaliana. The activity of auxin polar transport in the upper portion of inflorescence axis of wildtype plants ofArabidopsis thaliana was significantly lower than that of the basal part. The activities of auxin polar transport in the upper portion of inflorescence
axes ofap1 andclv1 mutants were significantly higher than that of wild-type plant. However, those of other flower mutants tested,ap3-1, ag, pi, Fl-40, Fl-54, Fl-89 andpin-formed, were extremely low as compared with that of wild one. We got some evidence that the reduction of the activity of auxin polar
transport is concerned with the growth and development of plants. We could mimic it by the removal of all flowers and pods
including mature or immature seeds. Moreover, artificial pollination inap3-1 andpi mutants, in which no seeds are found naturally, resulted in the partial recovery of the activity of auxin polar transport
in inflorescence axis. Considering these results in this study together with the fact that inhibitors of auxin polar transport
generated almost same disruptions ofpin-formed orpinoid mutants which normally had no flowers in inflorescence axis (Okadaet al. 1991, Uedaet al. 1992, Bennettet al. 1995), the systern of auxin polar transport and its activity in inflorescence axis seems to be essential for the development
of flower bud in early stage ofArabidopsis thaliana, and the activity of auxin polar transport is also regulated by the formation of flowers and seeds in inflorescence axis. |
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Keywords: | Araldopsis thaliana Auxin polar transport Flower formation Growth Mutant |
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