Graduate Thesis Or Dissertation

 

Studies on Acacia senegal (L.) Wild. in western Sudan with special reference to variation among populations, host x soil inoculum interaction among populations, and host x Rhizobium strains interactions Public Deposited

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  • Seeds of A. senegal (L.) Wild from four populations across a rainfall gradient in western Sudan were grown in two sites. One site is on an upper dune crest - (sandy soil) and the other site is on the lower slope of the same dune - (sandy loam soil). Soils significantly influenced all growth parameters except foliar N concentration. Seedlings of all populations survived and grew better on the upper dune crest (sandy soil). Populations differed only in foliar N. concentration. Although the number of first order branches did not differ among populations, there were large differences among individual seedlings in two of the populations. In a second study four populations of A. senegal from western Sudan were cross inoculated with soil from the same populations. Population x soil inoculum interaction was significant for all measured growth parameters. Specific nitrogenase activity, averaging 22.2 uml/g fw/h, did not differ significantly between populations, soil inoculum Sources, or with interaction between the two. The greatest specificity between populations and source of inoculum was shown by shoot and nodule weights in populations from the extremes of the rainfall gradient. Seedlings from all populations exhibited a relatively high relationship between home soil and root length. In a third ezperjement, two Acacia senega1 seed lots, one collected near Elobjed, a relatively low rainfall zone, and the other near Rae, a high rainfall zone (both In western Sudan), were inoculated with each of the following Rhjzobjum strains: strain AR 14, isolated from A. radiana, strain AN 12, isolated from A. nilotica adjestrjnqs, strain P3 12, isolated from Prosopis juliflora, strain TAL 1595 isolated from A. pennetu1a, and strain ASK isolated from A. Senegal. Popu1ation x rhizobium strain interaction was significant for shoot height. from the high rainfall zone was Height of Kas seedlings more sensitive to strain treatment than that of Elobied seedlings from the low rainfall zone, Strain main effect was highly significant for Shoot Weight. Seedlings inoculated with ASK strain, isolated from A. Senegal, had a greater weight, especially in comparison to PJ 12 strains, which were isolated from prosopis juliflora. Seedlings inoculated with the ASK strain nodulated earlier than seedlings inoculated with other strains.
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