A Petunia Homeodomain-Leucine Zipper Protein, PhHD-Zip, Plays an Important Role in Flower Senescence

作者：Chang, Xiaoxiao; Donnelly, Linda; Sun, Daoyang; Rao, Jingping^*; Reid, Michael S.; Jiang, Cai-Zhong

来源：PLos One, 2014, 9(2): e88320.

DOI：10.1371/journal.pone.0088320

• ABSCISIC-ACID
• ARABIDOPSIS-THALIANA
• WATER-DEFICIT
• ETHYLENE BIOSYNTHESIS
• SENESCING PETALS
• ENDOGENOUS ABA
• SHOOT GROWTH
• DNA-BINDING
• GENES
• TRANSCRIPTION

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.

• 出版日期2014-2-14
• 单位西北农林科技大学