Baboucarr Manneh : Genetic, physiological and modelling approaches towards tolerance to salinity and low nitrogen supply in rice

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29 Mar 2004 13:30
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr.ir. P.C. Struik (Crop Physiology)prof.dr.ir. P. Stam (Plant Breeding - Selection Methods and Sustainable Resistance)
Co Promotor: dr. F.A. van Eeuwijk

 Variability of rice yield and options for its genetic improvement were determined in The Gambia under fresh water and saline conditions with or without nitrogen fertilizer. Results indicated that rice could be bred for general adaptability to different fertilizer regimes and specific adaptability to either fresh water or saline conditions. For high yield potential, grain-number attributes should be increased in fresh water while grain-filling attributes should be increased in saline water. Putative quantitative trait loci were identified for yield and yield components in all environments. Both rankings and mean yields of genotypes were successfully estimated through marker-based predictions. High biomass production was found to be essential for high yield potential. Effects of leaf weight, stem weight, dry matter allocation to shoots and growth duration on yield differed between environments. The model ORYZA1 gave good predictions of grain yield and biomass and revealed potential yield improvements for diverse rice genotypes.
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