Screening of Sorghum-genotypes in terms of growth and resource use efficiency under future climatic conditions
For to ensure an efficient plant biomass production in the future, the climatic changes as predicted by the IPCC, i.e. increase in atmospheric CO2 concentration, temperature and summer drought, has to be considered. Currently, the C4 crop maize has the greatest biomass yield and is the mostly used energy crop. Sorghum has also C4-photosynthesis and a similar growth habit but is better to warm sites and has a higher drought tolerance as compared to maize. at present there are efforts to grow sorghum as an alternativ to maize for to extend crop rotation and shift the area for cultivation to marginal land to reduce the competition for land between food and energy production.
In this project the tolerance of different Sorg¬hum genotypes and maize to drought under elevated CO2 concentrations will be investigated. Total biomass production will be measured and resource use and use efficiency of radiation and water. In this way it will be investigated, whether genotypes differ in biomass production and which process is responsible for that.
Plants will be grown on an experimental field under different CO2 and watering conditions by using the FACE-technique
Biomass production will be measured and the use of the resources radiation and water and finally the resource use efficiencies will be calculated.
Who has a higher biomass production under optimum and water limited growing conditions, maize or sorghum?
Who profits more from the increase of the CO2 concentration under summer drought, sorghum or maize?
Maize has a higher growth potential as compared to Sorghum and this necessarily leads to a high water demand of the plant and the water savings under CO2 enrichment can be transformed in additional biomass production. So, current cultivars of maize are superior to current sorghum cultivars even on marginal land and under elevated CO2 concentrations.
4.2009 - 12.2012
Project funding number: FKZ 0315421D
Project status: finished