This study was undertaken to evaluate genotype x environment interaction
(gxe) and yield stability of eight bambara groundnut genotypes in three
locations at two planting dates; to compare the stability parameters used
in determining stable yields, to correlate yield and related characters of the
crop, to determine the effect of planting date on yield and yield
components; and to assess the effect of location and genotype on protein
content.
Field trials were planted with two different planting dates in three localities.
A randomized complete block design with three replications was used.
Data collected was days to 50% flower, number of pods per plant, grain
yield, haulm yield, 100 seed weight, and maturity days.
Data was subjected to simple ANOVAâs for all measured characteristics.
Significant differences were found for most of these characteristics.
Combined analyses of variance were computed across locations to
determine the performance of yield and related characteristic. Significant
differences were found for genotype, environment and Gxe interactions.
The best genotype was SB4-4 across locations.
Four stability parameters namely Eberhart and Russell regression model,
Lin and Binnsâ Cultivar Superiority Measure (Pi), Wricke ecovalence (Wi)
and Additive Main Effects and Multiplicative Interaction (AMMI) were
performed to determine yield stability. SB16-5A was regarded the most stable by Eberhart and Russell, SB19-3 by Wricke ecovalence, SB7-1 by
ASV and SB4-4 by cultivar superiority and yield rankings The results
showed that SB19-3 was the third most stable genotype according to
Eberhart and Russell and Lin and Binns yield ranking; and the first and
second most stable genotypes by the Wricke and AMMI model. Therefore
SB19-3 proved to be the most stable genotype. ASV and Wricke
ecovalence value ranked SB4-4 and SB1-1 to be the first and second
most stable genotypes for 100 seed weight, while ranking SB19-3 first and
second respectively for number of pods per plant. The AMMI model
summarizes patterns and relationship between gxe interactions and helps
to obtain a good yield estimates. The results for stability of yields are not
conclusive since the data is for one season, therefore the trials must be
repeated to validate the results.
Correlation analyses were first computed for separate trials and then for
combined trials across locations. Hundred seed weight, haulm yield,
number of pods per plant and root weight were positively correlated with
grain yield with haulm yield and 100 seed weight having strong positive
correlations to grain yield. Planting date did not significantly affect yield
and protein content was also not significantly affected by gxe interactions.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ufs/oai:etd.uovs.ac.za:etd-01262007-134206 |
| Date | 26 January 2007 |
| Creators | Masindeni, Dimakatso Roselina |
| Contributors | Dr L Owoeye, Prof MT Labuschagne |
| Publisher | University of the Free State |
| Source Sets | South African National ETD Portal |
| Language | en-uk |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.uovs.ac.za//theses/available/etd-01262007-134206/restricted/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University Free State or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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