ICRISAT Archival Report 2006 - The seedlings of success in the ...

glumes make threshing difficult. The potential of inter-racial hybrids was exhibited in Samanko late-sown
environment. However, due to seed limitations, these hybrids were not tested in other environments and their
response across variable sowing dates still needs to be assessed.
Results of multi-location guinea race sorghum heterosis trials analysed (2007)
Sets of hybrids made on a wide range of new guinea race A-lines, representing West, Central, and North-, as well
South-Eastern African origins with a wide rage of restorer lines from WCA were evaluated at 4 locations during
2005 and 2006. Data analysis is underway, and shall results in a PhD thesis.
S Dagnoko, HFW Rattunde with IER, INRAN
Activity 3A2.5: Physiological characterization of heterosis in Guinea-race hybrids
Milestones: The contribution of individual sorghum yield components and panicle traits to grain yield heterosis
quantified (2008)
As part of the heterosis trials mentioned above a wide range of panicle traits have been assessed. These assessments
will be used to gain insights into the role of specific yield components for increasing grain yield in superior hybrids.
S Dagnoko, HFW Rattunde, B Clerget, E Weltzien with IER, INRAN
Adaptation of first generation guinea hybrids to different agronomic conditions assessed (2008)
Five superior hybrids were tested at three different stand densities and higher fertility, to test whether the yield
potential of these materials is higher than that of parental varieties.
B Clerget and HFW Rattunde
Output target 3A3: Sorghum and pearl hybrid parents made available to NARS
Activity 3A3.1: Develop diversified Guinea-race sorghum maintainer and restorer lines
Milestones: Ten A/B pairs of diverse Guinea Landrace varieties advanced to BC5 generation (2006)
A diverse set of Guinea landrace maintainer lines were identified from the Guinea-race Core Collection, which
samples the 3,900 Guinea-race accessions in the ICRISAT World Sorghum collection. A total of 13 maintainer lines
were sterilized to produce A/B pairs. The maintainer lines were crossed to CK60A, and subsequently backcrossed to
the recurrent parent, with the BC4 generation completed in the 2005/2006 off-season and the BC5 generation being
completed in the 2006 rainy season (Table 3). These 13 A/B pairs extend the diversity of landrace-based Guinearace
A-lines beyond the initial three A-lines (Fambe A, IPS0001 A, and CSM 219A, all of Malian origin) previously
developed, both for geographical origin, grain size and maturity. All of these A lines, being based on landrace
germplasm, are of tall height.
A dwarf, photoperiod sensitive Guinea-race A-line (GPN 271-20 A) was produced from a derivative of the randommating
Dwarf Guinea Population. This population derivative also contains the A1 cytoplasm, from CK60A. This is
truly dwarf, with short internodes and photoperiod sensitive, flowering at the beginning of October with late June
sowing date. This A-line was multiplied in isolation in 2006.
Table 3. Genotypes and number of BC4 lines and corresponding B lines sown 2006 per recurrent parent and
backcrossed to BC5
Landrace Parent Snowden race Origin No. of Lines
IS 27580A/B guiniense Burkina Faso 7
IS 6749A/B guiniense Burkina Faso 5
IS 6781A/B guiniense Burkina Faso 5
IS IS27494A/B gambicum Burkina Faso 4
IS 19970A/B guiniense Senegal 7
IS 20064A/B margaritiferum Senegal 4
IS 20114A/B gambicum Senegal 2
IS 22677A/B guiniense Mali 16
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