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Genetic variation in nitrogen (N) use efficiency, N uptake, and N utilization was analyzed in a doubled haploid (DH) population derived from winter oilseed rape cultivars. The aim was to analyze the relative importance of uptake and utilization efficiency and to identify parameters that allow an easy selection of N efficient genotypes. Fifty-four DH lines were tested in four to seven environments...
Tomatoes are the most important vegetable, globally as well as in Germany. Outdoor tomato production is seriously impaired due to increasing infections with evolving late blight (Phytophthora infestans) populations. Within organic agriculture, research is being conducted to develop regionally adapted and open pollinated cultivars of outdoor tomatoes with late blight field resistance. In the present...
Near infrared-reflectance spectroscopy (NIRS) is widely used as an efficient and non-destructive method for seed quality analysis in oilseed rape (Brassica napus L.). Normally, calibration equations are developed for seed samples sizes of 3–4 g. However, during the breeding process much less than 3 g of samples are frequently only available for analysis. The objective of the present study was to analyse...
Vernonia galamensis is a wild plant from the family Asteraceae which is endemic to East Africa and has the potential to become a new oil crop for industrial uses. Its seed oil is rich in vernolic acid, a fatty acid of high interest for oleochemical applications. However, a breeding program for Vernonia galamensis cultivars with high seed and oil yields requires knowledge about the genetic variability...
Summary Allopolyploids are widely spread in the plant kingdom. Their success might be explained by positive interactions between homoeologous genes on their different genomes, similar to the positive interactions between different alleles of one gene causing heterosis in heterozygous diploid genotypes. In allopolyploids, such interactions can also occur in homozygous genotypes, and may therefore be...
The genetic variation for tocopherol contents was investigated in a very divergent collection of 87 winter rapeseed genotypes grown in the greenhouse and in two years in the field. Genotypic and environmental effects were highly significant for alpha-, gamma- and total tocopherol contents and the alpha-/gamma-tocopherol ratio. Field and greenhouse environments differed significantly (p < 0.001)...
The potential of near-infrared reflectance spectroscopy (NIRS) for the simultaneous analysis of seed weight, total oil content and its fatty acid composition in intact single seeds of rapeseed was studied. A calibration set of 530 single seeds was analysed by both NIRS and gas-liquid chromatography (GLC) and calibration equations for the major fatty acids were developed. External validation with a...
The objective of this work was to evaluate the potential of near-infrared reflectance spectroscopy (NIRS) as a rapid method to estimate the fatty acid composition of the oil in intact-seed samples of rapeseed. A total of 549 samples (3 g intact seed) from selected mutant and breeding lines were scanned by NIRS, and 220 of them were selected and scanned again by using two different adapters, which...
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