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Four Seasons of Learning and Engaging Smallholder Farmers - icrisat

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Table 11-21: Grain yield (kg per ha) performance <strong>of</strong> TGx 1987-62F <strong>and</strong> TGx 1987-10F in multilocation trials for<br />

three years in comparison with check varieties in Nigeria<br />

Variety 2008 2009 2010 Mean % increase<br />

over TGx<br />

1835-10E<br />

% increase<br />

over TGx<br />

1485-1D<br />

TGx 1987-62F 2241 1334 1946 1841 41 50<br />

TGx 1987-10F 2161 1225 1770 1719 32 40<br />

TGx 1835-10E 1005 1599 1302<br />

TGx 1485-1D 1699 574 1412 1228<br />

Trial mean 1891 1126.4 1892.5 1637<br />

Se 92 142.2 128.5<br />

P (Variety) 0.0001 0.0000 0.0001<br />

2008, 2009 <strong>and</strong> 2010 trials comprised 20, 22 <strong>and</strong> 20 test genotypes, respectively, <strong>and</strong> the number <strong>of</strong> locations in each year ranged from<br />

three to five.<br />

Table 11-22: Rust severity (%) on TGx 1987-62F <strong>and</strong> TGx 1987-10F at Ibadan (rust hotspot), Nigeria, in 2009<br />

<strong>and</strong> 2010 in comparison with check varieties<br />

Variety 2009 2010 Mean<br />

TGx 1987-62F 0.6 0.4 0.5<br />

TGx 1987-10F 0.3 0.1 0.2<br />

TGx 1835-10E 14.1 11.0 12.5<br />

TGx 1485-1D 63.8 59.1 61.4<br />

Trial mean 8.4 3.8 6.1<br />

SE 3.5 2.1<br />

P 0.0000 0.0001<br />

Segregating materials generated<br />

Based on previous work <strong>and</strong> current project activities, a total <strong>of</strong> 24 soybean parental lines have been<br />

identified for crossing work to generate segregating populations. The work is aimed at recombining<br />

several desirable traits that included promiscuity, high yield, high biomass, earliness, rust tolerance,<br />

drought tolerance <strong>and</strong> adaptation to the southern Africa conditions. At Chitedze, Malawi, segregating<br />

populations <strong>of</strong> F 2<br />

<strong>and</strong> F3 generations were grown to select for adaptation, earliness, disease resistance,<br />

high biomass <strong>and</strong> pod load in the 2009/10 season. High shoot biomass is an indicator <strong>of</strong> enhanced<br />

biological nitrogen fixation as the plots did not receive nitrogenous fertilizers. A total <strong>of</strong> 33 individual<br />

plants were selected for these desirable traits from the F 2<br />

crosses. From the F 3<br />

a total <strong>of</strong> 1099 individual<br />

plants were selected. F 1<br />

plants were also raised in the screen house from 18 crosses <strong>and</strong> their F 2<br />

seeds<br />

were harvested.<br />

At IITA-Ibadan station, a total <strong>of</strong> 378 F 3<br />

family rows were raised in 2009 from 33 crosses <strong>and</strong> a total <strong>of</strong><br />

485 individual plants were selected for their rust <strong>and</strong> other leaf diseases resistance, vigorous biomass<br />

<strong>and</strong> pod load (Table 11-23). Similarly, 130 F 5<br />

family rows were grown at the same location <strong>and</strong> 183<br />

desirable plants in terms <strong>of</strong> disease resistance, vigor <strong>and</strong> pod load were selected (Table 11-24). A total<br />

<strong>of</strong> 21 new crosses were also made from selected parental lines. Recombinant inbred lines (RILs) from<br />

two crosses were also raised for phenotyping. From TGx 1485-1D × UG5 <strong>and</strong> TGx 1485-1D × Soy104,<br />

a total <strong>of</strong> 299 <strong>and</strong> 287 RILs, respectively, were phenotyped for disease resistance <strong>and</strong> other associated<br />

traits. The F4 <strong>and</strong> F6 families <strong>of</strong> the selected plants were also grown in 2010.<br />

236<br />

<strong>Engaging</strong> <strong>Smallholder</strong> <strong>Farmers</strong> | Tropical Legumes II Project

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