TAKING ADVANTAGE OF SEGREGATION DISTORTION TO INCREASE VARIABILITY IN BREEDING

DR. Paul Njiruh NthakanioDr. James I. Kanya Dr. John M. Kimani Dr. Raphael Wanjogu FUNDED / COLLABORATORSNATIONAL IRRIGATION BOARB , EUC, UoN, KARI

1.1 Background : Rice production in Kenya.

• Over 300tonnes of rice is consumed in Kenya. • About 100tones is locally produced. • In Kenya rice is mainly grown in Mwea, Ahero, Bunyala, West

Kano, Yala Swamp (MoA, 2011) • About 98% of Mwea rice is Basmati.• By year 2030 Kenya population is expected to be 60.0million. • Rice yield is expected to increase 600% to feed the population

1.2 Response to National challenges

In 2013 conference we were challenged to;

i) Breed for lines that yield higher under local conditions ii) Have a realistic response to climate change

Facts on Basmati • In favour i) Aroma ii) Good cooking qualities iii) Relative early maturing (85days to heading)iv) Relative resistant to blast (compared to other lines)

Weakness of Basmati• Tall and weak stem – it cannot take a lot of Nitrogen which

responsible for yield increase• Lodging • Low tillering ability • Conserved variety

Discovery • Cross between Basmati and V1,V2 and V3 Lead to segregation distortion at F2

generation (Njiruh et al. 2013) • F2 deviate from Mendelia laws of segregation • Using Science to make product: this know was used to

develop varied recombinant inbreed lies (numerous in numbers)

2. Objective • Use segregation distortions to increase variation in

recombinant inbred lines • Select lines superior than Basmati but with acceptable

breeding and cooking traits

Results or Outputs

New lines

Achievement's • High tillering ability • Dwarf- it can take more nitrogenous fertilizer • Early maturity

Acknowledgement • National irrigation Board • Embu University College • University of Nairobi• Kenya Agricultural Research Institute