A Petunia homeodomain-leucine zipper protein, PhHD-Zip, plays an important role in flower senescence

Flower senescence is initiated by developmental and environmental signals, and regulated by gene transcription. A homeodomain-leucine zipper transcription factor, PhHD-Zip, is up-regulated during petunia flower senescence. Virus-induced gene silencing of PhHD-Zip extended flower life by 20% both in...

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Veröffentlicht in:	PloS one 2014-02, Vol.9 (2), p.e88320
Hauptverfasser:	Chang, Xiaoxiao, Donnelly, Linda, Sun, Daoyang, Rao, Jingping, Reid, Michael S, Jiang, Cai-Zhong
Format:	Artikel
Sprache:	eng
Schlagworte:	Abscisic acid Abscisic Acid - pharmacology Abundance Agriculture Amino acids Arabidopsis Biology Biosynthesis Dehydration Dianthus caryophyllus DNA binding proteins Droughts Ethylene Ethylenes - pharmacology Flowers Flowers & plants Flowers - drug effects Flowers - genetics Flowers - growth & development Gene expression Gene Expression Profiling Gene Expression Regulation, Plant - drug effects Gene silencing Gene Silencing - drug effects Genes Genes, Plant - genetics Genetic aspects Genetic engineering Genetic research Homeobox Homeodomain Proteins - genetics Homeodomain Proteins - metabolism Hormones Horticulture Leucine Leucine zipper proteins Leucine Zippers Models, Biological Molecular Sequence Data Overexpression Petunia Petunia - drug effects Petunia - genetics Petunia - growth & development Plant Proteins - genetics Plant Proteins - metabolism Plant sciences Plants, Genetically Modified Pollination - drug effects Proteins RNA, Messenger - genetics RNA, Messenger - metabolism Seeds Senescence Sequence Homology, Amino Acid Sodium chloride Stress, Physiological - drug effects Stress, Physiological - genetics Studies Transcription (Genetics) Transcription factors Viruses
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Zusammenfassung:	Flower senescence is initiated by developmental and environmental signals, and regulated by gene transcription. A homeodomain-leucine zipper transcription factor, PhHD-Zip, is up-regulated during petunia flower senescence. Virus-induced gene silencing of PhHD-Zip extended flower life by 20% both in unpollinated and pollinated flowers. Silencing PhHD-Zip also dramatically reduced ethylene production and the abundance of transcripts of genes involved in ethylene (ACS, ACO), and ABA (NCED) biosynthesis. Abundance of transcripts of senescence-related genes (SAG12, SAG29) was also dramatically reduced in the silenced flowers. Over-expression of PhHD-Zip accelerated petunia flower senescence. Furthermore, PhHD-Zip transcript abundance in petunia flowers was increased by application of hormones (ethylene, ABA) and abiotic stresses (dehydration, NaCl and cold). Our results suggest that PhHD-Zip plays an important role in regulating petunia flower senescence.
ISSN:	1932-6203 1932-6203
DOI:	10.1371/journal.pone.0088320