Journal
ANNALS OF BOTANY
Volume 125, Issue 1, Pages 119-130Publisher
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcz154
Keywords
Auxin; heterogeneous phosphate supply; lateral-root development; maize; root morphology
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Funding
- National Science Foundation of China [31572190, 31772402, 31330070]
- National Key R&D Program of China [2017YFD0200204, 2017YFD0200200]
- Rural and Environment Science and Analytical Services Division (RESAS) of the Scottish Government
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Background and Aims Roots take up phosphorus (P) as inorganic phosphate (Pi). Enhanced root proliferation in Pi-rich patches enables plants to capture the unevenly distributed Pi, but the underlying control of root proliferation remains largely unknown. Here, the role of auxin in this response was investigated in maize (Zea mays). Methods A split-root, hydroponics system was employed to investigate root responses to Pi supply, with one (heterogeneous) or both (homogeneous) sides receiving 0 or 500 mu m Pi. Key results Maize roots proliferated in Pi-rich media, particularly with heterogeneous Pi supply. The second-order lateral root number was 3-fold greater in roots of plants receiving a heterogeneous Pi supply than in roots of plants with a homogeneous Pi supply. Root proliferation in a heterogeneous Pi supply was inhibited by the auxin transporter inhibitor 1-N-naphthylphthalamic acid (NPA). The proliferation of lateral roots was accompanied by an enhanced auxin response in the apical meristem and vascular tissues at the root tip, as demonstrated in a DR5::RFP marker line. Conclusions It is concluded that the response of maize root morphology to a heterogeneous Pi supply is modulated by local signals of Pi availability and systemic signals of plant P nutritional status, and is mediated by auxin redistribution.
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