Literature DB >> 25560879

A KNOTTED1-LIKE HOMEOBOX protein regulates abscission in tomato by modulating the auxin pathway.

Chao Ma1, Shimon Meir1, Langtao Xiao1, Jianhua Tong1, Qing Liu1, Michael S Reid2, Cai-Zhong Jiang2.   

Abstract

A gene encoding a KNOTTED1-LIKE HOMEOBOX PROTEIN1 (KD1) is highly expressed in both leaf and flower abscission zones. Reducing the abundance of transcripts of this gene in tomato (Solanum lycopersicum) by both virus-induced gene silencing and stable transformation with a silencing construct driven by an abscission-specific promoter resulted in a striking retardation of pedicel and petiole abscission. In contrast, Petroselinum, a semidominant KD1 mutant, showed accelerated pedicel and petiole abscission. Complementary DNA microarray and quantitative reverse transcription-polymerase chain reaction analysis indicated that regulation of abscission by KD1 was associated with changed abundance of genes related to auxin transporters and signaling components. Measurement of auxin content and activity of a DR5::β-glucuronidase auxin reporter assay showed that changes in KD1 expression modulated the auxin concentration and response gradient in the abscission zone.
© 2015 American Society of Plant Biologists. All Rights Reserved.

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Year:  2015        PMID： 25560879      PMCID： PMC4348773          DOI： 10.1104/pp.114.253815

Source DB:  PubMed          Journal:  Plant Physiol        ISSN： 0032-0889            Impact factor:   8.340


  42 in total

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10.  De novo Transcriptome Sequencing and Development of Abscission Zone-Specific Microarray as a New Molecular Tool for Analysis of Tomato Organ Abscission.

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