Characterization of rice (Oryza saliva L.) germplasm for cold tolerance through field evaluation and participatory selection in the Southern highlands
| dc.contributor.author | Lobulu, John | |
| dc.date.accessioned | 2026-04-13T10:31:39Z | |
| dc.date.available | 2026-04-13T10:31:39Z | |
| dc.date.issued | 2013 | |
| dc.description | Dissertation | |
| dc.description.abstract | A study was conducted at Igurusi in Mbarali district of Mbeya region, Tanzania to evaluate and identify rice genotypes that perform better in the field under cold stress conditions. Three experiments were conducted, two in the field and one in the laboratory. The first field experiment was conducted during the wet season from December, 2010 to May, 2011 and the second from June to December, 201 l(coo!/dry season). Fifty two (52) test genotypes and five checks were randomly allocated to four blocks each with a maximum of 20 plots at a spacing of 20 cm between and within rows in an augmented Randomized Complete Block Design. Agronomic and morphological data were collected for grain yield and yield attributes followed by grain quality variables for ten selected genotypes using participatory varietal selection. Analyses of variance revealed significant to very highly significant differences among the test genotypes for the characters studied in both experiments. This indicates that, the test genotypes exhibit a sufficient amount of genetic variability in which desired lines can be selected for further manipulation. Correlation studies revealed that, grain yield was significantly correlated with filled spikelets/ panicle, days to 50% flowering and 90% maturity in experiment one and with filled spikelets/panicle and panicle length in experiment two. Thus, selection for these traits would be effective in grain yield improvement. Estimates of genetic parameters showed high heritability coupled with high genetic coefficient of variation (GCV) and genetic advance as percentage of the mean for productive tillers per hill, grain yield, filled spikelets per panicle and percent sterility in experiments one and two except for filled spikelets per panicle and percent sterility in experiments one and two except for filled spikelets in experiment two. This suggests that these traits are controlled by additive gene action and can therefore be improved through simple/progeny selection methods. Ten genotypes were selected as cold tolerant materials through Participatory Varietal Selection PVS). Grain quality analysis showed that five genotypes have combined acceptable quality and agronomic characteristics and are therefore ear marked for recommendation in Tanzania. | |
| dc.description.sponsorship | Alliance for Green Revolution in Africa (AGRA) and Sokoine University of Agriculture (SUA) through the department of Crop Science and Production | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/20.500.14820/7478 | |
| dc.language.iso | en | |
| dc.publisher | Sokoine University of Agrculture | |
| dc.subject | Genotypes | |
| dc.subject | Rice | |
| dc.subject | Germplasm | |
| dc.subject | Cold condition | |
| dc.title | Characterization of rice (Oryza saliva L.) germplasm for cold tolerance through field evaluation and participatory selection in the Southern highlands | |
| dc.type | Thesis |