期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 164, 期 4, 页码 452-459出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2006.03.006
关键词
autoregulation of nodulation; long- and short-distance signals; root development; symbiosis
The autoregulation of nodulation (AON) is a universal mechanism to Legumes to control the extent of nodulation via a systemic circuit and if genetically altered, as in the Lotus japonicus har1-1 mutant, leads to hypernodulation and aberrant root development. Increased nodulation of har1-1 is associated with pleiotropic effects both in the absence and presence of the symbiosis. We used two different grafting techniques to investigate the control of the non-symbiotic retarded root growth phenotype of har1-1, and demonstrate that altered root growth in the non-symbiotic condition is controlled by the genotype of both the shoot and the root. Based on these results and on the Gresshoff and Delves [Plant genetic approaches to symbiotic nodulation and nitrogen fixation in legumes. Plant Gene Res 1986;3:159-206] AON model, we propose an advanced working model for control. of root development by LJHAR1. (c) 2006 Elsevier GrnbH. All rights reserved.
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