Cell division activity determines the magnitude of phosphate starvation responses in Arabidopsis

• DOI: 10.1111/j.1365-313x.2007.03070.x
• Publication Date: 2007-04-06T00:37:50Z
• Authors: Fan Lai; Jennifer Thacker; Yuanyuan Li; Peter Doerner
• Keywords: Tip growth

Summary Phosphate (P i ) is a major limiting factor for plant growth. Plants respond to P supplies by inducing suite of adaptive responses comprising altered growth behaviour, enhanced acquisition and reduced demand that together define distinct physiological state. In ‐starved plants, continued root required from new sources, yet meristem activity consumes . Therefore, we analysed the relationship between organ growth, phosphate starvation‐responsive (PSR) gene expression content in Arabidopsis thaliana under growth‐promoting or inhibitory conditions. Induction PSR after transfer plants ‐depleted conditions quantitatively reflects prior levels acquisition, hence sensitive balance supply demand. When are ‐starved, shoot exacerbates, whereas inhibition suppresses, starvation responses, suggesting magnitude specifies level Inhibition cell‐cycle activity, but not cell expansion reduces expression. Thus, plants. We propose ultimate arbiter growing organs, other factors influence do so affecting through modulation activity.