Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2006
Authors
Alhaji S. Jeng Roshan M. Bajracharya Bed M. Dahal Bishal K. Sitaula Subodh ShermaAbstract
No abstract has been registered
Authors
Erik Lysøe Sonja Klemsdal Rasmus J. N. Frandsen Thomas Johansen U. Thrane Henriette GieseAbstract
No abstract has been registered
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Authors
Rein Drenkhan Märt HansoAbstract
No abstract has been registered
Abstract
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Abstract
Dissolved aluminium was fractionated in the field and the laboratory using a cation exchange method. Although absolute differences between results obtained from field and laboratory fractionations were generally small, relative differences, expressed as the ratio between labile aluminium determined after laboratory fractionation (Alll) and that obtained after field fractionation (Allf), could be large. The differences found were not statistically significant, although this may simply reflect the spread in the results. Alll/Allf had no apparent relationship with the temperature difference between the field and the lab. Although some significant correlations were found between Alll/Allf and H+, no significant correlations were found with the equivalent relative difference in {H+} between the lab and the field. Neither was any significant correlation found with dissolved organic carbon.
Abstract
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Abstract
We have made and partially sequenced two subtracted cDNA libraries, one representing genes predominantly expressed in a tree from an early-flushing family of Norway spruce (early-flushing library; EFL) and the second from a late flushing family (late flushing library; LFL), during 4 weeks before bud burst. In the EFL, expressed sequence tags (ESTs) encoding proteins of the photosynthetic apparatus and energy metabolism and proteins related to stress (abiotic and biotic) and senescence were abundant. ESTs encoding metallothionein-like and histone proteins as well as transcription factors were abundant in the LFL. We used quantitative real-time reverse transcription polymerase chain reaction to study the expression patterns of 25 chosen genes and observed that the highest levels of activity for most genes were present when plants were still ecodormant. The results indicate that the late flushing is not a result of a delay in gene activity, but is rather associated with an active transcriptional process. Accordingly, certain metabolic processes may be turned on in order to prevent premature flushing. We discuss the putative role of the studied genes in regulation of bud burst timing. Among the candidate genes found, the most interesting ones were the DNA-binding proteins, water-stress- related genes and metallothioneins. Expression patterns of some genes involved in chemical modification of DNA and histones indicate that epigenetic factors are involved in the timing of bud burst. In the obtained transcriptomes, we could not find genes commonly believed to be involved in dormancy and bud set regulation (PHY, CRY, ABI etc.) in angiosperm plants.
Abstract
No abstract has been registered
Abstract
No abstract has been registered