Glutamine rapidly induces the expression of key transcription factor genes involved in nitrogen and stress responses in rice roots.

Abstract:

BACKGROUND:Glutamine is a major amino donor for the synthesis of amino acids, nucleotides, and other nitrogen-containing compounds in all organisms. In addition to its role in nutrition and metabolism, glutamine can also function as a signaling molecule in bacteria, yeast, and humans. By contrast, the functions of glutamine in nutrition and as a signaling molecule remain unclear in plants. RESULTS:We demonstrated that glutamine could effectively support the growth of rice seedlings. In glutamine-treated rice roots, the glutamine contents increased dramatically, whereas levels of glutamate remained relatively constant. Transcriptome analysis of rice roots revealed that glutamine induced the expression of at least 35 genes involved in metabolism, transport, signal transduction, and stress responses within 30 min. Interestingly, 10 of the 35 early glutamine responsive genes encode putative transcription factors, including two LBD37-like genes that are involved in the regulation of nitrogen metabolism. Glutamine also rapidly induced the expression of the DREB1A, IRO2, and NAC5 transcription factor genes, which are involved in the regulation of stress responses. CONCLUSIONS:In addition to its role as a metabolic fuel, glutamine may also function as a signaling molecule to regulate gene expression in plants. The rapid induction of transcription factor genes suggests that glutamine may efficiently amplify its signal and interact with the other signal transduction pathways to regulate plant growth and stress responses. Thus, glutamine is a functional amino acid that plays important roles in plant nutrition and signal transduction.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Kan CC,Chung TY,Juo YA,Hsieh MH

doi

10.1186/s12864-015-1892-7

subject

Has Abstract

pub_date

2015-09-25 00:00:00

pages

731

issue

1

issn

1471-2164

pii

10.1186/s12864-015-1892-7

journal_volume

16

pub_type

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