Modeling the effect of salt-stress on growth, nodulation and nitrogen fixation of cowpea (vigna unguiculata l.)
2006
Doleib, N.H., University of Juba, Khartoum (sudan). College of Applied and Industrial Sciences, Dept. of Biology | Elsheikh, E.A., University of khartoum, Shambat (Sudan). Faculty of Agriculture, Dept. of Soil Science
The effect of salinity on Bradyrhizobium strains and growth and symbiotic performance of cowpea (Vig1la u1lguiculata L.) was investigated in laboratory and pot experiments. Bradyrlzizobilll1l strains were more salt¬tolerant than cowpea plants. Salinity significantly (P~O.05) reduced the shoot and root dry weights, number and dry weight of nodules and nitrogen content of cowpea. Inoculation with Bradyrlzizobiu1ll strain ENRRI-16C significantly (P~O.05) increased all the parameters measured under normal and saline conditions. The results were also expressed in statistical models, which indicated positive relationships between plant weight and nodules number and negative relationships between salinity and nodules number. These statistical models are good tools to predict the status of nodulation or plant weight or both, grown under saline conditions without uprooting the plant
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