Effect of Two Azospirill Um Isolates on the Growth and Nitrogen Content of Tef (Eragrostis Tef (Zucc.) Trotter)
| dc.contributor.advisor | Assefa Fassil (PhD) | |
| dc.contributor.advisor | Fetene Masreha (PhD) | |
| dc.contributor.author | Zewdie Solomon | |
| dc.date.accessioned | 2018-07-11T07:23:27Z | |
| dc.date.accessioned | 2023-11-09T04:21:53Z | |
| dc.date.available | 2018-07-11T07:23:27Z | |
| dc.date.available | 2023-11-09T04:21:53Z | |
| dc.date.issued | 1998-06 | |
| dc.description.abstract | Two diazotrophic bacteria, coded as A31 and A32, were isolated from roots of the lefvarieties DZ-01-354 and DZ-01-196, respectively grown in pots on loam soil from Debrezeit. These isolates were characterized to the generic level and further comparison with the description of the type cnltures Azospirillum lipoferum (ATCC 29707) and Azospirillum brasilense (ATCC 29145). These comparisons showed that the two isolates closely resemble A. lipofernm . However, on the basis of some differences in biochemical characteristics, it was suspected that these isolates may be different strains of A. lipoferum. In an attempt to investigate the effect of these isolates on the yield and nitrogen content of tef, inoculation studies on pot grown tef plants was conducted. Root inoculation of seedlings of the two tef varieties with Iml sterile water suspension (107-10' colony forming units (cfu) Iml ) of these isolates produced significant (p < 0.05) increases in height, grain yield, total shoot and root weight, root shoot ratio, total grain nitrogen and protein content of grains. Grain yield increases up to 11. 6 % and total nitrogen and protein content of grains up to 5.7 % over and above un inoculated controls were observed. The bacterial isolate A32 has performed better than A31 in promoting growth and yield of both varieties. Differential plant responses due to different bacterial treatments was found to be significant (p < 0.05) for parameters as height, root shoot ratio and total nitrogen and protein content of grains on both varieties. Of the two tef varieties Dz-01-196 responded better than DZ-O 1-354 to inoculation with either of the isolates as demonstrated in a higher percent increases over the respective controls for most growth parameters The existence of a possible specific interaction between host cultivar and bacterial isolate which governs plant yield responses was suspected. Finally, the potential role of Azospirillum inoculation of tef seedlings on reducing fertilizer requirements was discussed. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/7857 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Biology | en_US |
| dc.title | Effect of Two Azospirill Um Isolates on the Growth and Nitrogen Content of Tef (Eragrostis Tef (Zucc.) Trotter) | en_US |
| dc.type | Thesis | en_US |