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Published on October 11, 2007; 10.1104/pp.107.103788

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Received June 12, 2007
Accepted October 1, 2007

Phosphate-starvation root architecture and anthocyanin-accumulation responses are modulated by the GA-DELLA signaling pathway in Arabidopsis

Caifu Jiang , Xiuhua Gao , Lili Liao , Nicholas P. Harberd , and Xiangdong Fu *

The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, National Centre for Plant Gene Research, Beijing, 100101, China; John Innes Centre, Norwich, NR4 7UH, United Kingdom

* Corresponding author; email: xdfu{at}genetics.ac.cn.

Phosphate (Pi) is a macronutrient that is essential for plant growth and development. However, the low mobility of Pi impedes uptake, thus reducing availability. Accordingly, plants have developed physiological strategies to cope with low Pi availability. Here we report that characteristic Arabidopsis phosphate-starvation responses are in part dependent on the activity of the nuclear growth-repressing DELLA proteins (DELLAs), core components of the gibberellin (GA) signaling pathway. We first show that multiple shoot and root Pi-starvation responses can be repressed by exogenous GA, or by mutations conferring a substantial reduction in DELLA function. In contrast, mutants having enhanced DELLA function exhibit enhanced Pi-starvation responses. We also show that Pi-deficiency promotes the accumulation of a GFP-tagged DELLA (GFP-RGA) in root cell nuclei. In further experiments we show that Pi-starvation causes a decrease in the level of bioactive GA, and associated changes in the levels of gene transcripts encoding enzymes of GA metabolism. Finally, we show that the GA-DELLA system regulates the increased root hair length that is characteristic of Pi-starvation. In conclusion, our results indicate that DELLA-mediated signaling contributes to the anthocyanin accumulation and root architecture changes characteristic of phosphate-starvation responses, but do not regulate Pi-starvation induced changes in phosphate uptake efficiency or the accumulation of selected Pi-starvation responsive gene transcripts. Pi-starvation causes a reduction in bioactive GA level, which in turn causes DELLA accumulation, thus modulating several adaptively significant plant Pi-starvation responses.




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