Efficiënt gebruik van snijmaïs. Deel 2: invloed rastype en oogststadium op opbrengst en kwaliteit = Efficient use of silage maize. Part 2: effect of genotype and harvest stage on crop yield and quality

In the period 2003-2005 effects of genotypes and maturity stage on yield, quality, conservation an nutrition were investigated. This research was focusing on crop yield and quality. It was concluded that there was hardly any difference in optimum harvest stage between genotypes. The optimum harvest stage varied from 35 to 40 % dry matte

Ziektebestrijding in veldbeemdgras : zaadoogst 2001 en verwerking over alle uitgevoerde proeven

In het in dit verslag beschreven uitgevoerde onderzoek is getoetst wat voor effect een ziektebestrijding in de herfst in graszaadteelt heeft op de gewasontwikkeling en de ziekteaantasting indien deze ziektebestrijding al dan niet wordt gecombineerd met een ziektebestrijding kort voor bloei in het voorjaar. De beginhypothese voor het uitgevoerde onderzoek is dat een ziektebestrijding in de herfst niet nodig is indien het gewas sterk ontwikkeld is maar wel nodig is als een nog zwak ontwikkeld veldbeemdgewas door schimmelziekten (o.a. roest) wordt aangetas

Efficiënt gebruik van snijmaïs. Deel 2: invloed rastype en oogststadium op opbrengst en kwaliteit = Efficient use of silage maize. Part 2: effect of genotype and harvest stage on crop yield and quality

In the period 2003-2005 effects of genotypes and maturity stage on yield, quality, conservation an nutrition were investigated. This research was focusing on crop yield and quality. It was concluded that there was hardly any difference in optimum harvest stage between genotypes. The optimum harvest stage varied from 35 to 40 % dry matte

Biased chloroplast and mitochondrial transmission in somatic hybrids of Allium ampeloprasum L. and Allium cepa L

Somatic hybrid plants, produced by symmetric protoplast fusion between leek (Allium ampeloprasum) and cytoplasmic male sterile onion (Allium cepa), were analysed for their organelle composition. Mitochondrial DNA (mtDNA) analyses were performed using PCR amplification of the V7 region of the mitochondrial small ribosomal RNA (srRNA) gene in conjunction with restriction site analysis and southern hybridization. Of the 55 hybrids analysed with the PCR method only three hybrids had mtDNA restriction fragment patterns of both parents, while the remaining hybrids displayed a pattern identical to A. ampeloprasum. Detailed analysis of 18 of these hybrids with southern hybridization using five mitochondrial probes revealed that 15 hybrids possessed a rearranged mitochondrial genome of both parents, but with a predominance of mtDNA fragments of A. ampeloprasum. The other three hybrids had the same hybridization pattern as A. ampeloprasum, indicating that these hybrids probably contain the unaltered parentalA. ampeloprasum mitochondrial genome. The same 18 hybrids were analysed for their cpDNA using the Petunia chloroplasts DNA pPCY64 probe. A total of 15 hybrids possessed chloroplasts identical to A. ampeloprasum and three had A. cepa chloroplasts. Therefore, it is suggested that the chloroplasts of the hybrids did not sort out randomly. Also a novel combination of chloroplasts and mtDNA was found in two hybrids. VA:IB