subproject D: "Evaluation of innovations regarding canopy dynamics and drought tolernce related traits"
During the last 50 years wheat production rose clearly because of breeding progress, however yields have stagnated in Western Europe since the 21st century. The yield of single genotypes is determined by traits like amongst others phenological development, radiation absorption and photosynthesis, harvest index, drought tolerance and resistance to diseases. To identify these yield relevant traits and characterise their occurrence depending on the cropping system, in subproject D canopy dynamics and drought tolerance are observed especially focussing on non-destructive measuring methods.
At two sites (Hohenschulen, Schleswig-Holstein und Groß Gerau, Hessen) weekly to biweekly measurements with a tractor based sensor system are conducted at 220 genotypes in three managements/cropping intensities and three replications at growth stage BBCH 30 to BBCH 80. Furthermore with the help of the tractor based sensor system the effect of drought and heat stress is examined in a rain-out shelter (Hohenschulen), which induces drought stress by temporarily excluding precipitation (220 genotypes, two replications).
The data – micrometeorological parameters, canopy temperature as well as spectral canopy reflection – are supported by manually measuring LAI and phenological monitoring. The spectral reflection and derived vegetation indices enable a description of the canopy development for a large amount of genotypes and with a high temporal resolution. In combination with micrometeorological data the canopy temperature indicates the canopy water supply state and therefore drought tolerance.
Objective of the subproject D is the development of a non-destructive method for measurements of canopy dynamics and drought tolerance of winter wheat genotypes under different ecosystem and management effects.
project leader: Prof. Dr. Henning Kage
project assistance: M.Sc. Sabrina Nagler