| Abstract: | Accumulation and distribution of dry matter in old and new german summer wheat-cultivars
Five old german summer wheat varieties bred in the first third of this century were compared with five new varieties in an outdoor pot trial. The new genotypes outyielded the old varieties by only approximately 10%. It may be supposed that this small genetic gain in grain yield resulted from breeding for superior bread-making quality. The new genotypes produced more kernels per plant. The tkw of both groups of varieties was nearly equal. However, new and old varieties did not show a particular yield structure. The grain/straw-ratio of the new varieties was higher. The old varieties reached anthesis later and had produced more above-ground biomass at anthesis as well as at maturity. Whereas the old genotypes had higher stem and sheath weights at flowering, the weights and areas of leaf laminae were simular for old and new varieties. The new genotypes tended to greater upper leaves and had greener lower leaves, but did not gain more dry matter after anthesis. The postfloral loss of dry matter from the vegetative tissue depended on the organ and the age of the varieties. |
