Journal
PLANT CELL
Volume 25, Issue 10, Pages 4166-4182Publisher
OXFORD UNIV PRESS INC
DOI: 10.1105/tpc.113.116251
Keywords
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Funding
- Swiss National Foundation [31003A-138339]
- Sino-Swiss Science and Technology Cooperation Program [IZLCZ3 123946, 2009DFA32040]
- Swiss National Science Foundation (SNF) [31003A_138339] Funding Source: Swiss National Science Foundation (SNF)
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cis-natural antisense transcripts (cis-NATs) are widespread in plants and are often associated with downregulation of their associated sense genes. We found that a cis-NAT positively regulates the level of a protein critical for phosphate homeostasis in rice (Oryza sativa). PHOSPHATE1;2 (PHO1;2), a gene involved in phosphate loading into the xylem in rice, and its associated cis-NAT(PHO1;2) are both controlled by promoters active in the vascular cylinder of roots and leaves. While the PHO1;2 promoter is unresponsive to the plant phosphate status, the cis-NAT(PHO1;2) promoter is strongly upregulated under phosphate deficiency. Expression of both cis-NAT(PHO1;2) and the PHO1;2 protein increased in phosphate-deficient plants, while the PHO1;2 mRNA level remained stable. Downregulation of cis-NAT(PHO1;2) expression by RNA interference resulted in a decrease in PHO1;2 protein, impaired the transfer of phosphate from root to shoot, and decreased seed yield. Constitutive overexpression of NAT(PHO1;2) in trans led to a strong increase of PHO1;2, even under phosphate-sufficient conditions. Under all conditions, no changes occurred in the level of expression, sequence, or nuclear export of PHO1;2 mRNA. However, expression of cis-NAT(PHO1;2) was associated with a shift of both PHO1;2 and cis-NAT(PHO1;2) toward the polysomes. These findings reveal an unexpected role for cis-NAT(PHO1;2) in promoting PHO1;2 translation and affecting phosphate homeostasis and plant fitness.
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