6SERRAJ R,SINCLAIR T R,PURCELL L C. Symbiotic N2 fixation response to drought[J]. Experibot,1999,50:143-155.
7TROTMAN A P, WEAVERR W. Tolerance of clover rhizo- bia to heat and desiciation stress in soil [J].Soil Sci.Soc Am, 1995, 59(2) :466-470.
8YOSHIBA Y,KIYOSUE T,NAKASHIMA K,et al. Regulation of Levels of Proline as an Osmolyte in Plants under Water Stress [J]. Plant and Cell Physiology,1997,38 (10):1095- 1102.
9PELLEGRINESCHI A,REVNOLDS M,PACHECO M,et al. Stress-induced expression in wheat of the Arabidopsis thaliana DREB1A gene delays water stress symptoms under greenhouse conditions[J]. Genome,2004,47(3):493-500.
