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StMYB44 negatively regulates phosphate transport by suppressing expression of PHOSPHATE1 in potato.

Abstract：

:Phosphorus is an important macronutrient for plant growth, but often deficient in soil. To understand the molecular basis of the complex responses of potato (Solanum tuberosum L.) to phosphate (Pi) deficiency stress, the RNA-Seq approach was taken to identify genes responding to Pi starvation in potato roots. A total of 359 differentially expressed genes were identified, among which the Solanum tuberosum transcription factor gene MYB44 (StMYB44) was found to be down-regulated by Pi starvation. StMYB44 was ubiquitously expressed in potato tissues and organs, and StMYB44 protein was exclusively localized in the nucleus. Overexpression of StMYB44 in potato resulted in lower accumulation of Pi in shoots. Transcriptomic analysis indicated that the abundance of S. tuberosum PHOSPHATE1 (StPHO1), a Pi transport-related gene, was reduced in StMYB44 overexpression lines. In contrast, knock-out of StMYB44 by a CRISPR/Cas9 system failed to increase transcription of StPHO1. Moreover, StMYB44 was found to interact in the nucleus with AtWRKY6, a known Arabidopsis transcription factor directly regulating PHO1 expression, and StWRKY6, indicating that StMYB44 could be a member of the regulatory complex controlling transcription of StPHO1. Taken together, our study demonstrates that StMYB44 negatively regulates Pi transport in potato by suppressing StPHO1 expression.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Zhou X,Zha M,Huang J,Li L,Imran M,Zhang C

doi

10.1093/jxb/erx026

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

1265-1281

issue

5

eissn

0022-0957

issn

1460-2431

pii

3058836

journal_volume

68

pub_type

杂志文章

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