8Coicoechea N,M. c. Antolin and M. Sauchez - Diaz. Influence of arbuscular mycorrhizae and Rhizobium on nutrient conteat and water relations in drought stressed alfalfa. Plant and Soil, 1997,192:261 - 268.
9Davies W J,Zhang Jian hua.. Root signals and the regulation of growth and development of plants in drying soil[J]. Annu Rev Plant physiol Plant Mol, 1991, (42) : 55 - 59.
10Mohammad Athar and Douglas A. Johnson. Influence of drought on competition between selected Rhizobium meliloti anstrains d naturalized soil rhizobia in alfalfa, 1996, (184) :231 - 241.
二级参考文献16
1[1]Bostein DR, White O, Olsen GJ, et al. Am J Hum Genet, 1980,32:314～ 331.
