|MA, CHAO - US Department Of Agriculture (USDA)|
|MEIR, SHIMON - Volcani Center (ARO)|
|XIAO, LANGTAO - Hunan Agricultural University|
|TONG, JIANHUA - Hunan Agricultural University|
|LIU, QING - Hunan Agricultural University|
|REID, MICHAEL - University Of California|
Submitted to: Plant Physiology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/30/2014
Publication Date: 1/5/2015
Publication URL: http://www.plantphysiology.org/content/167/3/844.full
Citation: Ma, C., Meir, S., Xiao, L., Tong, J., Liu, Q., Reid, M.S., Jiang, C. 2015. A knotted1-like homeobox protein regulates abscission in tomato by modulating the auxin pathway. Plant Physiology. 167(3):844-853.
Technical Abstract: KD1, a gene encoding a KNOTTED1-LIKE HOMEOBOX transcription factor is known to be involved, in tomato, in ontogeny of the compound leaf. KD1 is also highly expressed in both leaf and flower abscission zones. Reducing abundance of transcripts of this gene in tomato, using both virus induced gene silencing and stable transformation with a silencing construct driven under an abscission-specific promoter, resulted in a striking retardation of pedicel and petiole abscission. In addition, Pts, a semi-dominant KD1 mutant showed earlier pedicel and petiole abscission. cDNA microarray and RT-PCR analysis indicated that regulation of abscission by KD1 was based on the responses of auxin signaling and transport genes. Auxin content and a DR5::GUS auxin reporter assay confirmed that KD1 modulated the auxin level and response in the abscission zone.