The Mitochondrial Phosphate Transporters Modulate Plant Responses to Salt Stress via Affecting ATP and Gibberellin Metabolism in Arabidopsis thaliana

We report that the mRNA accumulations of AtMPTs were up-regulated by high salinity stress in A. thaliana seedlings

Wei Zhu; Qing Miao; Dan Sun; Guodong Yang; Changai Wu; Jinguang Huang; Chengchao Zheng

2012

Scholarcy highlights

  • High salinity is an important abiotic stress that is commonly encountered by plants growing in their native environments
  • In this paper we report that the expression level of A. thaliana mitochondrial phosphate transporter genes is significantly induced under high salinity conditions, and the sensitivity of the AtMPT overexpressors to salt stress might be due to an increase in adenosine triphosphate content
  • The Characteristic of AtMPTs To understand the biological functions of MPT in plants, a total of three MPT genes have been identified in the A. thaliana genome, which we designate here as AtMPT1, AtMPT2, and AtMPT3
  • To explore whether the bioactive gibberellin levels were affected by changes in the AtMPT expression, we determined by Enzyme Linked Immunosorbent Assay analysis the content of gibberellins, GA1 and GA4, which have been shown to play important roles in plant development in A. thaliana
  • Cellular ATP is regenerated from ADP and phosphate in mitochondria, and the transport of phosphate from cytosol into the mitochondrial matrix is catalyzed by the mitochondrial phosphate transporter
  • We show that the expression of gibberellin metabolism genes and ELISA-detectable gibberellins are regulated by AtMPTs in response to salt stress
  • Under salt stress conditions, the transcripts of GA20ox and GA2ox genes were significantly up- and downregulated, respectively, presumably accounting for the elevated levels of Enzyme Linked Immunosorbent Assay-detectable gibberellins within the AtMPT3 overexpressors

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