2 Wymer C L, Bibikova T N, Gilroy S. Cytoplasmic free calcium distributions during the development of root hairs of Arabidopsis thaliana. Plant J, 1997, 12: 427-439？？
[2]
3 Ehrhardt D W, Wais R, Long S R. Calcium spiking in plant root hairs responding to Rhizobium nodulation signals. Cell, 1996, 85: 673-681？？
[3]
5 Raynal P, Pollard H B. Annexins: The problem of assessing the biological role for a gene family of multifunctional calcium- and phospholipid-binding proteins. Biochim Biophys Acta, 1994, 1197: 63-93
[4]
7 Niebel F C, Lescure N, Cullimore J V, et al. The Medicago truncatula MtAnn1 gene encoding an annexin is induced by Nod factors and during the symbiotic interaction with Rhizobium meliloti. Mol Plant Microbe Interact, 1998, 11: 504-513？？
13 Gong Z Y, He Z S, Zhu J B, et al. Sinorhizobium meliloti nifA mutant induces different gene expression profile from wild type in Alfalfa nodules. Cell Res, 2006, 16: 818-829？？
[9]
15 Covitz P A, Smith L S, Long S A. Expressed sequence tags from a root-hair-enriched Medicago truncatula cDNA library. Plant Physiol,1998, 117: 1325-1332？？
[10]
16 Gy？rgyey J, Vaubert D, Jiménez-Zurdo J I, et al. Analysis of Medicago truncatula nodule expressed sequence tags. Mol Plant Microbe Interact, 2000, 13: 62-71？？
[11]
18 Lévy J, Bres C, Geurts R, et al. A putative Ca2+ and calmodulin-dependent protein kinase required for bacterial and fungal symbioses. Science, 2004, 303: 1361-1364？？
[12]
19 Gargantini P R, Gonzalez-Rizzo S, Chinchilla D, et al. A CDPK isoform participates in the regulation of nodule number in Medicago truncatula. Plant J, 2006, 48: 843-856？？
[13]
21 Nakagawa T, Kawaguchi M. Shoot-applied MeJA suppresses root nodulation in Lotus japonicus. Plant Cell Physiol, 2006, 47: 176-180
[14]
26 Gonzalez-Rizzo S, Crespi M, Frugier F. The Medicago truncatula CRE1 cytokinin receptor regulates lateral root development and early symbiotic interaction with Sinorhizobium meliloti. Plant Cell, 2006, 18: 2680-2693？？
1 Ishida T, Kurata T, Okada K, et al. A genetic regulatory network in the development of trichomes and root hairs. Annu Rev Plant Biol,2008, 59: 365-386？？
[17]
4 Cohn J, Day R B, Stacey G. Legume nodule organogenesis. Trends Plant Sci, 1998, 3: 105-110？？
[18]
6 Konopka-Postupolska D. Annexins: Putative linkers in dynamic membrane-cytoskeleton interactions in plant cells. Protoplasma, 2007,230: 203-215？？
[19]
8 Manthey K, Krajinski F, Hohnjec N, et al. Transcriptome profiling in root nodules and arbuscular mycorrhiza identifies a collection of novel genes induced during Medicago truncatula root endosymbioses. Mol Plant Microbe Interact, 2004, 17: 1063-1077？？
14 Limpens E, Ramos J, Franken C, et al. RNA interference in Agrobacterium rhizogenes transformed roots of Arabidopsis and Medicago truncatula. J Exp Bot, 2004, 55: 983-992？？
[22]
17 Larrainzar E, Wienkoop S, Weckwerth W, et al. Medicago truncatula root nodule proteome analysis reveals differential plant and bacteroid responses to drought stress. Plant Physiol, 2007, 144: 1495-1507？？
[23]
20 Ligero F, Lluch C, Olivares J. Evolution of ethylene from roots of Medicago sativa plants inoculated with Rhizobium meliloti. J Plant Physiol, 1986, 125: 361-365？？
[24]
22 Suzuki A, Akune M, Kogiso M, et al. Control of nodule number by the phytohormone abscisic acid in the roots of two legume species. Plant Cell Physiol, 2004, 45: 914-922？？
[25]
23 Terakado J, Fujihara S, Goto S, et al. Systemic effect of a brassinosteroid on root nodule formation in soybean as revealed by the application of brassinolide and brassinazole. Soil Sci Plant Nutr, 2005, 51: 389-395？？
[26]
24 Bauer P, Ratet P, Crespi M, et al. Nod factors and cytokinins induce similar cortical cell division, amyloplast deposition and Msenod12A expression patterns in alfalfa roots. Plant J, 1996, 10: 91-105
[27]
25 Lorteau M A, Ferguson B J, Guinel F C. Effects of cytokinin on ethylene production and nodulation in pea (Pisum sativum) cv. Sparkle. Physiol Plant, 2001, 112: 421-442？？
