Mrs. Wen Jiang: "Physiology and modeling of zinc allocation in aerobic rice"

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29 Feb 2008 11:00
Unit: Wageningen University
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen
Organisation: Wageningen University
Promotor: prof.dr.ir. P.C. Struik (Crop Physiology)
Co Promotor: Prof.dr.ir. H. van Keulen (Promotor), Dr. T.J. Stomph

 Zinc (Zn) deficiency in humans is widespread in many regions of the world, especially in the developing world. This research aimed at exploring the allocation of Zn in rice plants, as a basis for establishing the potential for enhancing the grain allocation of zinc and thereby the grain Zn mass concentration (ZnMC). Enhancing plant Zn uptake, had little effect on grain ZnMC, and two apparent barriers for Zn transport were identified one between stem and rachis and one between bran and endosperm. Most of the Zn in grains originated from uptake by roots after flowering, Zn remobilisation from leaves contributed little. A descriptive simulation model was developed to increase quantitative understanding of the relevant processes involved in grain zinc accumulation. Also, two new indices were proposed for identifying genotypes that perform well in terms of yield and grain ZnMC, both when grown with limited and with sufficient soil Zn supply. 
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