Jan Rinze van der Schoot

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Black poplar (Populus nigra L.) is a major species for European riparian forests but its abundance has decreased over the decades due to human influences. For restoration of floodplain woodlands, the remaining black poplar stands may act as source population. A potential problem is that P. nigra and Populus deltoides have contributed to many interspecific(More)
Using an enrichment procedure, we have cloned and sequenced microsatellite loci from black poplar (Populus nigra L.) and developed primers for sequence-tagged microsatellite (STMS) analysis. Twelve primer pairs for dinucleotide repeats produced fragments of sufficient quality which were polymorphic in P. nigra. Some of them also showed amplification in(More)
Heterogeneity of the internal transcribed spacer ITS1 of the rDNA within individuals ofTulipa gesneriana L.,T. kaufmanniana Regel, and their interspecific hybrids was analyzed by PCRRFLP, using the polymorphic restriction enzymesRsaI andHinfI, and by nucleotide sequence analysis. In most cases, the sum of the sizes of the restriction fragments was higher(More)
Populus nigra L. is a pioneer tree species of riparian ecosystems that is threatened with extinction because of the loss of its natural habitat. To evaluate the existing genetic diversity of P. nigra within ex-situ collections, we analyzed 675 P. nigra L. accessions from nine European gene banks with three amplified fragment length polymorphism (AFLP) and(More)
In vitro propagation of oil palm (Elaeis guineensis Jacq.) frequently induces a somaclonal variant called ‘mantled’ abnormality, in which the stamens of both male and female flowers are transformed into carpels. This leads to a reduced yield or complete loss of the harvest of palm oil. The high frequency of the abnormality in independent lines and the high(More)
Although grasses have dense rooting systems, nutrient uptake and productivity can be increased, and N-leaching reduced, if rooting is further improved. The variation in root mass of 16 varieties of Lolium perenne was studied under field conditions in two experiments on sandy soil in The Netherlands. The chosen varieties differed in genetic and aboveground(More)
An efficient procedure for identification of tulip cultivars in dry bulb stage, based on polymorphism in the isozymes of esterase, is described. Out of 91 cultivars (excl. mutants) which were analyzed for their esterase banding patterns, 78 (86%) could be uniquely identified using native PAGE of bulb protein extracts. A group of 14 Darwin hybrids showed(More)
As the insight in evolution of colonic polyps in the general asymptomatic population continues, so does evolves the treatment of severe dysplastic polyps. With this knowledge of the possible, carcinogenic evolution and the upcoming of laparoscopy in the treatment of colorectal cancer, a combined laparoand endoscopic per-operative localization of the polyp,(More)
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