Biologia plantarum 2013, 57:739-748 | DOI: 10.1007/s10535-013-0327-z

The involvement of auxin in root architecture plasticity in Arabidopsis induced by heterogeneous phosphorus availability

Q. Liu1, G. Q. Zhou1, F. Xu1, X. L. Yan1, H. Liao1, J. X. Wang1,*
1 College of Natural Resources and Environment, Root Biology Center, South China Agricultural University, Guangzhou, P.R. China

Homogeneous low phosphorus availability was reported to regulate root architecture in Arabidopsis via auxin, but the roles of auxin in root architecture plasticity to heterogeneous P availability remain unclear. In this study, we employed auxin biosynthesis-, transport- and signalling-related mutants. Firstly, we found that in contrast to low P (LP) content in the whole medium, primary root (PR) growth of Arabidopsis was partially rescued in the medium divided into two parts: upper with LP and lower with high P (HP) content or in the reverse arrangement. The down part LP was more effective to arrest PR growth as well as to decrease density of lateral roots (DLR) than the upper LP, and effects were dependent on polar auxin transport. Secondly, we verified that auxin receptor TIR1 was involved in the responses of PR growth and lateral root (LR) development to P supply and loss of function of TIR1 inhibited LR development. Thirdly, effects of heterogeneous P on LRD in the upper part of PR was dependent on PIN2 and PIN4, and in the down part on PIN3 and PIN4, whereas density of total LRs was dependent on auxin transporters PIN2 and PIN7. Finally, heterogeneous P availability altered the accumulation of auxin in PR tip and the expression of auxin biosynthesisrelated genes TAA1, YUC1, YUC2, and YUC4. Taken together, we provided evidences for the involvement of auxin in root architecture plasticity in response to heterogeneous phosphorus availability in Arabidopsis.

Keywords: auxin biosynthesis-related genes; lateral roots; PIN; primary root; TIR
Subjects: auxin; root architecture; phosphorus; growth; transgenic plants; mutants; auxin biosynthesis genes
Species: Arabidopsis thaliana

Received: January 29, 2011; Accepted: January 28, 2013; Published: December 1, 2013Show citation

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Liu, Q., Zhou, G.Q., Xu, F., Yan, X.L., Liao, H., & Wang, J.X. (2013). The involvement of auxin in root architecture plasticity in Arabidopsis induced by heterogeneous phosphorus availability. Biologia plantarum, 57(4), 739-748. doi: 10.1007/s10535-013-0327-z.
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