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Iron availability affects phosphate deficiency-mediated responses, and evidences of cross talk with auxin and zinc in Arabidopsis

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Title Iron availability affects phosphate deficiency-mediated responses, and evidences of cross talk with auxin and zinc in Arabidopsis
 
Creator Rai, Vandna
Sanagala, Raghavendrarao
Sinilal, Bhaskaran
Yadav, Sandeep
Sarkar, Ananda K.
Dantu, Prem Kumar
Jain, Ajay
 
Subject Arabidopsis thaliana
Auxin
Fe availability
Phosphate deficiency
PSR genes
Zn
 
Description Accepted date: February 21, 2015
Phosphate (Pi) is pivotal for plant growth and development. Pi deficiency triggers local and systemically regulated adaptive responses in Arabidopsis thaliana. Inhibition of primary root growth (PRG) and retarded development of lateral roots (LRs) are typical local Pi deficiency-mediated responses of the root system. Expression of Pi starvation-responsive (PSR) genes is regulated systemically. Here, we report the differential influence of iron (Fe) availability on local and systemic sensing of Pi by Arabidopsis. P-Fe- condition disrupted local Pi sensing, resulting in an elongated primary root (PR). Altered Fe homeostasis in the lpsi mutant with aberration in local Pi sensing provided circumstantial evidence towards the role of Fe in the maintenance of Pi homeostasis. Reporter gene assays, expression analysis of auxin-responsive genes (ARGs) and root phenotyping of the arf7arf19 mutant demonstrated the role of Fe availability on local Pi deficiency-mediated LR development. In addition, Fe availability also exerted a significant influence on PSR genes belonging to different functional categories. Together, these results demonstrated a substantial influence of Fe availability on Pi deficiency-mediated responses of ontogenetically distinct traits of the root system and PSR genes. The study also provided evidence of cross-talk between Pi, Fe and Zn, highlighting a complex tripartite interaction amongst them for maintaining Pi homeostasis.
This work was supported by the Department of Biotechnology,
Government of India [Ramalingaswamy Fellowships to A.J. (BT/
HRD/35/02/26/2009) and A.K.S. (BT/HRD/35/02/06/2008)];
Network Project on Transgenic in Crop, Indian Council of
Agricultural Research [to V.R.].
 
Date 2016-01-21T08:41:11Z
2016-01-21T08:41:11Z
2015
 
Type Article
 
Identifier Plant and Cell Physiology, 56(6): 1107-1123
1471-9053
http://172.16.0.77:8080/jspui/handle/123456789/566
http://pcp.oxfordjournals.org/content/56/6/1107.long
10.1093/pcp/pcv035
 
Language en_US
 
Publisher Oxford University Press