Evaluation of relative competitive ability and fitness of sorghum bicolor×sorghum halepense and sorghum bicolor×Sorghum sudanense F1 hybrids
View/ Open
Date
2015Author
Magomere, Titus O.
Obukosia, Silas D.
Shibairo, Solomon I.
Ngugi, Eliud K.
Mutitu, Eunice
Metadata
Show full item recordAbstract
Introgression of crop alleles in weedy sorghum populations may have an additive
effect on the adaptive character of the weeds making them more competitive. The
relative fitness in the F1 generation derived from weedy and crop sorghums was
evaluated using competitive assays in densely planted plots. Replacement series
assays were utilized to evaluate the competitiveness of the F1 in the greenhouse
and in the field. Interspecific crosses between S. halepense×S. bicolor and
S. sudanense×S. bicolor showed vigour in vegetative morphological parameters.
Tillering, plant height at maturity and plant weight of the F1 increased up to 70, 50
and 100%, respectively. The analysis of reproductive fitness associated traits
showed that the hybrids had Relative Crowding Coefficients (RCC) values of
between 5.2 and 10.1 on the number of panicles per plant. High RCC values of up
to 76.9 on the number of seeds per plant and values of up to 19.5 on the total seed
weight were observed in the hybrid indicating that the hybrid was more competitive
than the parents. The S. halepense×S. bicolor F1 progenies had less seed produced
when grown in competition with S. bicolor and an RCC of 4.3 was observed.
Ratooning was reduced in the F1 of S. halepense×S. bicolor when grown in
competition with S. halepense and an RCC of 5.0 was observed. The F1 hybrid of
S. sudanense×S. bicolor had significantly more panicles (6.3) than S. bicolor (1.9)
but it was not different from S. sudanense (6.0). Both F1 populations had high levels
of seed dormancy and forced germination gave 53% in S. halepense×S. bicolor and
69% in S. sudanense×S. bicolor which gave low values as compared to their
parents. Results from the study indicate that the release of improved transgenic
varieties should be preceded by investigation on the effect of their interaction with
weedy members in the sorghum genus.
Collections
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 3.0 United States
Related items
Showing items related by title, author, creator and subject.
-
Spatial modeling of sorghum (sorghum bicolor) growing areasin Kenyan arid and semi-arid lands
Kigen, Charles; Ochieno, Dennis; Muoma, John; Shivoga, William; Konje, Martha; Onyando, Zedekiah; Soi, Benard; Makindi, Stanley; Kisoyan, Philip; Mironga, John (Elixirpublishers : Agriculture, 2014-01-10)Sorghum (Sorghum bicolor) is an important African cereal crop and is listed among Africa’s lost crops but is now gaining popularity as other cereals are declining in production due to climatic change. To promote food ... -
Real time PCR mediated determination of the spontaneous occurrence of sorghum bicolor alleles in wild sorghum populations
Magomere, Titus O.; Ngugi, Eliud K.; Shibairo, Solomon I.; Mutitu, Eunice; Obukosia, Silas D. (Academic Journals (Kenya), 2015-02-18) -
The population structure of wild sorghum species in agro-ecological zones of Western Kenya
Magomere, Titus O.; Ngugi, Eliud K.; Obukosia, Silas D; Mutitu, Eunice.; Shibairo, Solomon I (2015)There is need to understand the genetic structure of wild sorghums that grow alongside cultivated traditional sorghum varieties in order to assess the potential effect of crop genes in wild populations. In this study, 175 ...