Barley plants over-expressing the NAC transcription factor gene HvNAC005 show stunting and delay in development combined with early senescence.

Abstract:

:The plant-specific NAC transcription factors have attracted particular attention because of their involvement in stress responses, senescence, and nutrient remobilization. The HvNAC005 gene of barley encodes a protein belonging to subgroup NAC-a6 of the NAC family. This study shows that HvNAC005 is associated with developmental senescence. It was significantly up-regulated following ABA treatment, supported by ABA-responsive elements in its promoter, but it was not up-regulated during dark-induced senescence. The C-termini of proteins closely related to HvNAC005 showed overall high divergence but also contained conserved short motifs. A serine- and leucine-containing central motif was essential for transcriptional activity of the HvNAC005 C-terminus in yeast. Over-expression of HvNAC005 in barley resulted in a strong phenotype with delayed development combined with precocious senescence. The over-expressing plants showed up-regulation of genes involved with secondary metabolism, hormone metabolism, stress, signalling, development, and transport. Up-regulation of senescence markers and hormone metabolism and signalling genes supports a role of HvNAC005 in the cross field of different hormone and signalling pathways. Binding of HvNAC005 to promoter sequences of putative target genes containing the T[G/A]CGT core motif was shown by direct protein-DNA interactions of HvNAC005 with promoters for two of the up-regulated genes. In conclusion, HvNAC005 was shown to be a strong positive regulator of senescence and so is an obvious target for the fine-tuning of gene expression in future attempts to improve nutrient remobilization related to the senescence process in barley.

journal_name

J Exp Bot

authors

Christiansen MW,Matthewman C,Podzimska-Sroka D,O'Shea C,Lindemose S,Møllegaard NE,Holme IB,Hebelstrup K,Skriver K,Gregersen PL

doi

10.1093/jxb/erw286

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

5259-73

issue

17

eissn

0022-0957

issn

1460-2431

pii

erw286

journal_volume

67

pub_type

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