Present address: Max Planck institut for plant breeding research, Carl-von-Linné Weg 10, 50829 Köln, Germany.
Identification of QTL controlling root growth response to phosphate starvation in Arabidopsis thaliana
Article first published online: 23 SEP 2005
Plant, Cell & Environment
Volume 29, Issue 1, pages 115–125, January 2006
How to Cite
REYMOND, M., SVISTOONOFF, S., LOUDET, O., NUSSAUME, L. and DESNOS, T. (2006), Identification of QTL controlling root growth response to phosphate starvation in Arabidopsis thaliana. Plant, Cell & Environment, 29: 115–125. doi: 10.1111/j.1365-3040.2005.01405.x
- Issue published online: 23 SEP 2005
- Article first published online: 23 SEP 2005
- Received 25 May 2005; received in revised form 21 June 2005; accepted for publication 26 June 2005
- natural variation;
- root architecture
One of the responses of plants to low sources of external phosphorus (P) is to modify root architecture. In Arabidopsis thaliana plantlets grown on low P, the primary root length (PRL) is reduced whereas lateral root growth is promoted. By using the Bay-0 × Shahdara recombinant inbred line (RIL) population, we have mapped three quantitative trait loci (QTL) involved in the root growth response to low P. The Shahdara alleles at these three QTL promote the response of the primary root to low P (i.e. root length reduction). One of these QTL, LPR1, located in a 2.8 Mb region at the top of chromosome 1, explains 52% of the variance of the PRL. We also detected a single QTL associated with primary root cell elongation in response to low P which colocalizes with LPR1. LPR1 does not seem to be involved in other typical P-starvation responses such as growth and density of root hairs, excretion of acid phosphatases, anthocyanin accumulation or the transcriptional induction of the P transporter Pht1;4. LPR1 might highlight new aspects of root growth that are revealed specifically under low P conditions.