Abstract
The influence of P-supply on root system architecture (primary root length, number and total length of lateral roots) through the effects of ethylene (ACC) and auxin [1-naphthylacetic acid (NAA)] has been examined in the legume white clover (Trifolium repens L.). Higher concentrations (1 and 10 μM) of ACC and NAA (100 nM) inhibited growth, while lower concentrations (100 nM ACC, 5 nM NAA) either had no effect or stimulated growth in P-sufficient (1 mM Pi) roots. In response to low (10 μM) P, a stimulation of primary root growth, number of lateral roots and mean length of lateral roots was observed, while a super-stimulation of these growth parameters occurred in response to subsequent 100 nM ACC treatment suggesting that the low P treatment increased the sensitivity of the roots to ethylene. Examination of the primary roots of DR5p::GUS transformants suggests that this change in sensitivity induced by low P occurs through the promotion of auxin signalling/transport to the root apex. These results are discussed in terms of the role of ethylene and the significance of changes in sensitivity to the hormone in modulating root system architecture in response to low P-supply.
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Abbreviations
- 1-MCP:
-
1-Methylcyclopropene
- ACC:
-
1-Aminocyclopropane-1-carboxylate
- NAA:
-
1-Naphthylacetic acid
- 1-NPA:
-
1-N-naphthylphthalamic acid
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Acknowledgments
The research was funded by the New Zealand Foundation for Research, Science and Technology (C02X0406), a NZAid scholarship to PTYD and a Massey University Doctoral scholarship to MR.
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10725_2011_9642_MOESM1_ESM.doc
Fig. S1. A white clover stolon grown hydroponically with a single well developed root subtending from node 3. PR, primary root; LR, lateral root. Supplementary material 1 (DOC 32 kb)
10725_2011_9642_MOESM2_ESM.doc
Fig. S2. The effects of P treatment (1 mM, P+; 10 μM, P-) as indicated, on root morphology of the rooted stolon cuttings of the transgenic (DR5p::GUS) line, TR29. Changes in the mean length of the PR (A) and the mean number of LRs (B). Values are means of six individual stolons with standard deviations of the means (represented as error bars). * indicates significant differences (P ≤ 0.05). Supplementary material 2 (DOC 956 kb)
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Dinh, P.T.Y., Roldan, M., Leung, S. et al. Regulation of root growth by auxin and ethylene is influenced by phosphate supply in white clover (Trifolium repens L.). Plant Growth Regul 66, 179–190 (2012). https://doi.org/10.1007/s10725-011-9642-6
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DOI: https://doi.org/10.1007/s10725-011-9642-6