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Plant Physiol, November 1999, Vol. 121, pp. 871-878

Pre-Anthesis Reserve Utilization for Protein and Carbohydrate Synthesis in Grains of Wheat1

Thomas Gebbing and Hans Schnyder*

Chair of Grassland Science, Technische Universität München, D-85350 Freising, Germany (T.G., H.S.); and Institut für Pflanzenbau, Universität Bonn, D-53115 Bonn, Germany (T.G., H.S.)

We assessed the contribution of pre-anthesis reserve C to protein and carbohydrate deposition in grains of wheat (Triticum aestivum L.) using a new approach comprised of steady-state 13C/12C labeling and separation of the protein and carbohydrate fractions of mature grains. Experiments were performed with two spring wheat cultivars (Kadett and Star) grown with differential N fertilizer supply over 2 years. Pre-anthesis reserves contributed between 30% and 47% of the C in protein and 8% to 27% of the C in carbohydrates of grains. Partitioning of pre-anthesis C among the grain fractions was strongly dependent on the C/N (w/w) ratio in mobilized pre-anthesis biomass (r2 = 0.92). There appeared to be no significant exchange of pre-anthesis C between amino acids and carbohydrates during redistribution. The mean apparent efficiency of mobilized carbohydrate-C use in grain filling (MECHO, estimated as the mass of pre-anthesis C deposited in grain carbohydrates per gram of pre-anthesis C mobilized from carbohydrates in vegetative plant parts) was 0.72, whereas that of protein-C (MEP) was 0.56. However, MEP and MECHO varied among treatments. MECHO increased with increasing contributions of water-soluble carbohydrates to total pre-anthesis carbohydrate mobilization. MEP decreased with increasing residence time of protein in vegetative biomass. Possible causes for variability of MEP and MECHO are discussed.

1 This work was supported by the Deutsche Forschungsgemeinschaft (project no. Ku 366/14-2).

* Corresponding author; e-mail root{at}romeo.grass.agrar.tu-muenchen.de; fax 49-8161-713243.

© 1999 American Society of Plant Physiologists


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