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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 5, No. 1, 2008, pp. 135-139
Bioline Code: st08016
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 5, No. 1, 2008, pp. 135-139

 en Cross inoculation studies: Response of Vigna mungo check for this species in other resources to inoculation with rhizobia from tree legumes growing under arid Environment
Mahmood, A. & Athar, M.

Abstract

Cross-inoculation experiments were conducted in the greenhouse to test the rhizobia isolated from nodules of seven tree legumes for their effectiveness in Vigna mungo plants. The tree legumes included Albizia lebbeck check for this species in other resources , Dalbergia sissoo check for this species in other resources , Leucaena leucocephala check for this species in other resources , Pithecellobium dulce check for this species in other resources , Prosopis cineraria check for this species in other resources , Prosopis glandulosa check for this species in other resources and Prosopis juliflora check for this species in other resources , all growing under arid environment. Rhizobia from these legumes formed nodules on the roots of Vigna mungo except isolates from Albizia lebbeck. Dry weight and nitrogen contents of Vigna mungo plants increased significantly (P<0.05) in response to cross inoculation as compared to uninoculated control. Rhizobia from Leucaena leucocephala and Prosopis glandulosa showed significant increase in dry weight (P<0.05) and nitrogen contents (P<0.05) than other inoculated treatments. The natural rhizobia of wild tree legumes growing under arid environment show higher tolerance to prevailing adverse conditions like salt stress, elevated temperatures and drought. These rhizobia may be used to inoculate wild as well as crop legumes cultivated in reclaimed desert lands. These rhizobia may have specific traits that can be transferred to other rhizobia through genetic engineering tools. The cross infection of agriculturally important legumes with isolates from wild legumes may prove a useful means of increasing nitrogen contents within these plants.

Keywords
Tree legumes, rhizobia, cross inoculation, Vigna radiat, nodulation, nitrogen fixation

 
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