Overexpression of a Kunitz-type trypsin inhibitor (AtKTI1) causes early flowering in Arabidopsis |
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Authors: | Jeong-gu Kim Seung-A Baek Kyung-Hoan Im |
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Institution: | (1) Department of Biology, University of Incheon, Incheon, 402-749, Korea |
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Abstract: | An early flowering mutant of Arabidopsis, elf32-D was isolated from activation tagging screening. The mutant flowered earlier than wild type under both long day and short
day conditions. The mutant phenotype was caused by overexpression of a Kunitz-type trypsin inhibitor gene (AtKTI1). The expression of AtKTI1 was detected in leaves, flowers, siliques and roots. In the vegetative state, no change of flowering integrator gene expression
was observed for AtKTI1 overexpressing plants. In contrast, at the reproductive stage, its overexpression resulted in the
down-regulation of FLC, a strong floral repressor which integrates the autonomous and vernalization pathways and also the up-regulation of FT and AP1, which are downstream floral integrator genes. It is probable that the AtKTI1 overexpression inhibits components of the flowering
signaling pathway upstream of FLC, eventually regulating expression of FLC, or causing perturbations in plant metabolism and thus indirectly affecting flowering. |
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Keywords: | Arabidopsis Early flowering FLOWERING LOCUS C (FLC) Kunitz-type trypsin inhibitor |
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