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.
2019
Authors
Yanliang Wang Hans LambersAbstract
Background To improve plant phosphorus (P)-acquisition efficiency to secure sustainable food production, an important step is to increase the concentration of plantavailable P in the rhizosphere. Root exudation of organic anions is a key strategy in mobilizing less-available soil P. Scope This review covers how organic anions (carboxylates) mobilize soil P and research methodologies applied. It then discusses the root-release of organic anions induced by low P availability and their contribution to soil P mobilization and plant P acquisition, and highlights the impact, challenges and perspectives in this research area. Conclusions The release of organic anions is increased considerably in some plant species, but very little in others under low P availability. Rhizosphere organic anions play important roles in increasing plantavailable P, but the contribution is greatly affected by many factors. In future research, improved and ecologically meaningful root exudation sampling methods, the use of mature leaf manganese (Mn) concentration or total 14C exudation as a proxy for rhizosphere carboxylates, case-by-case field experiments, molecular mechanisms underpinning organic anion biosynthesis and efflux under low P availability warrant further attention. Finally, carbon costs and multiple root trait combinations (e.g., root hairs plus root exudation) should be considered in crop breeding programs to generate more P-efficient cultivars.
Authors
Rune Slimestad Vilde Holm Hilde BarsettAbstract
No abstract has been registered
Authors
Svein SolbergAbstract
No abstract has been registered
Authors
Svein SolbergAbstract
No abstract has been registered
Authors
Trygve S. Aamlid Pia Heltoft Thomsen Gudni Thorvaldsson Anne Mette Dahl Jensen Tatsiana Espevig Karin Juul Hesselsøe Wendy Marie Waalen Torben Kastrup Petersen Trond Olav Pettersen Jan Tangsveen Per Sørensen Tania Gneist Bjarni HannessonAbstract
Denne tekst er sluttrapport for STERF-prosjektet: SCANGREEN 2015-18
Authors
Trygve S. Aamlid Gudni Thorvaldsson Anne Mette Dahl Jensen Pia Heltoft Thomsen Tatsiana Espevig Trond Olav Pettersen Jan TangsveenAbstract
No abstract has been registered
Authors
Lars T. HavstadAbstract
No abstract has been registered
Authors
Åsmund Asdal Guro Brodal Svein Øivind Solberg Flemming Yndgaard Roland von Bothmer Eivind MeenAbstract
The Nordic Gene bank established the 100 year seed storage experiment in Coal mine no. 3 outside Longyearbyen in 1986. Security duplicate samples of the Nordic seed collection had been deposited in permafrost in the coal mine since 1984. The experiment was established with the aim to monitor the longevity of seeds in this Nordic back-up seed collection and to gain general knowledge about the longevity of seed stored under permafrost conditions, as well as studying the survival of seed borne plant pathogens. The experimental set up included in total 41 seed lots of 17 agricultural and horticultural crop species commonly grown in the Nordic countries. The seed germination experiment included two or three varieties of each crop. The experimental part dedicated to studies of pathogen survival included seeds from 11 crops naturally contaminated by pathogens. The test program comprises germination and pathogen survival tests every 2.5 years during the first 20 years and then every 5 years for the last 80 years. In total 25 identical sets of test seeds placed in sealed glass tubes were packed in wooden boxes, one box for each planned test year. The tests have been carried out according to schedule and this report sums up the results from the first 30 years of the experiment. All tests have been carried out in accordance with the same ISTA-protocols. The results show that 9 of the 17 species after 30 years had retained more than 90 percent of their initial germination percentage. Beet (Beta vulgaris),Onions (Allium cepa), Cucumber (Cucumis sativus) and Kentucky bluegrass (Poa pratensis) had retained between 97 and 99 percent. At the lower end of the scale, rye (Secale cereale) had lost 51 percent of the initial germination percentage. Among the other cereals, barley (Hordeum vulgare)showed the highest viability as it had kept 89 percent viability, whilst wheat (Triticum aestivum) had kept 79 percent of the initial germination percentage. Mean germination of all test samples showed a drop from 87.2% at year0 to 76.9% at year 30. The pathogen tests showed that all pathogens had survived over the 30 years, more or less at the same contamination levels as were detected at the start of the project. To expand the knowledge about seed longevity under long-term seed storage it is recommended to establish a new more comprehensive experiment with seed materials from a wider selection of crops, and to include more replicates and seeds produced over more years, allowing more indepth statistical studies of the longevity development. A new experiment should be placed in the Svalbard Global Seed Vault, in order to provide results relevant for optimal gene bank conservation methods at -18°C and giving direct data on the longevity of seeds stored in the Seed Vault.
Authors
Trygve S. Aamlid Tatsiana Espevig Pia Heltoft Oiva Niemeläinen P. Ruttunnen A. Kedonpara d Widmark Tom Hsiang Annick BertrandAbstract
No abstract has been registered
Abstract
No abstract has been registered