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Karlsson, Laila
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Publications (10 of 21) Show all publications
Karlsson, L., Dalbato, A. L., Tamado, T. & Mikias, Y. (2015). EFFECT OF CULTIVAR, TRADITIONAL CORM PRE-TREATMENT AND WATERING ON SPROUTING AND EARLY GROWTH OF ENSET (Ensete ventricosum) SUCKERS. Experimental Agriculture, 51(2), 232-243
Open this publication in new window or tab >>EFFECT OF CULTIVAR, TRADITIONAL CORM PRE-TREATMENT AND WATERING ON SPROUTING AND EARLY GROWTH OF ENSET (Ensete ventricosum) SUCKERS
2015 (English)In: Experimental Agriculture, ISSN 0014-4797, E-ISSN 1469-4441, Vol. 51, no 2, p. 232-243Article in journal (Refereed) Published
Abstract [en]

Enset [Ensete ventricosum (Welw.) Cheesman (Musaceae)] is a multi-purpose and drought-tolerant crop, traditionally grown in Ethiopia. Food from enset has nutritive values similar to potato; it could improve food and livelihood security for many in larger geographical areas. Agronomical advice is needed which requires increased knowledge of management techniques. The purposes of this study were to (i) compare traditional corm pre-treatments when planting for sucker production, (ii) compare all six officially released cultivars regarding sprouting and (iii) investigate the effect of watering on newly buried corms. Emergence rate and number and characteristics of sprouts were recorded. Corms, from 63 two year old plants, were buried in local soil supplied with cow manure in Wolaita Sodo, Ethiopia. Emergence was recorded daily. After nine months, including one rainy season, all suckers (totally 4405) were harvested and individually recorded. Regardless of cultivar, minimum time to emergence was 50 days. Sprouts from split parent corms emerged earlier than from entire. Emergence occurred from 100% of corms, number of sprouts was strongly correlated to cultivar: average 28-106. The cultivars responded similarly to corm splitting: the more pieces the corm was split into, the more sprouts per parent corm. Average pseudostem diameter of the seven largest per parent corm: 8-10 cm for all cultivars, leaf length: 3.1-3.7 m, remaining 2700 smaller suckers: diameter 3 cm (SD 1.8). Watering decreased the average time to emergence and levelled out the differences between pre-treatments. The traditional belief is that watering as well as manure on corm cause rotting; manure is therefore usually put on the soil surface. On the contrary, full emergence and unexpected large suckers may be a result of careful soil preparation with manure applied on corm directly; watering resulted in an even emergence and growth. In conclusion, vegetative propagation of enset is efficient, but methods used and agronomical advice can be improved.

Place, publisher, year, edition, pages
Cambridge University Press (CUP): STM Journals, 2015
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-116945 (URN)10.1017/S0014479714000246 (DOI)000351404700005 ()
Note

Funding Agencies|Formas (The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning)

Available from: 2015-04-10 Created: 2015-04-10 Last updated: 2017-12-04
Milberg, P., Karlsson, J., Wessman, L. & Karlsson, L. (2014). Do differences in plasticity during early growth lead to differing success in competition? A test using four co-occurring annual Papaver. Plant Species Biology, 29(1), 92-100
Open this publication in new window or tab >>Do differences in plasticity during early growth lead to differing success in competition? A test using four co-occurring annual Papaver
2014 (English)In: Plant Species Biology, ISSN 0913-557X, E-ISSN 1442-1984, Vol. 29, no 1, p. 92-100Article in journal (Refereed) Published
Abstract [en]

Plant species differ in their ability to transform available resources to biomass and to respond in a plastic way to environmental circumstances; we hypothesized that such differences among four weed taxa of Papaver would explain differences in their competitive response. We first compared two populations each of Papaver rhoeasL., P.dubiumL. ssp. dubium, P.dubiumL. ssp. lecoqii (Lamotte) Syme and P.argemoneL., grown in a greenhouse for 6 weeks in a nutrient gradient combined with two light treatments to elucidate possible differences in responses. As there were clear differences, a second experiment evaluated whether these differences also meant differences in competitive response, during early growth, when tested against two crops (wheat, rape). The assumption that competitive response was linked to the ability to transform nutrient and light to biomass was not supported: even though differences in extent of plasticity existed, the effect of competition was similar for the taxa. Thus, higher plasticity and ability to transform available recourses to biomass did not lead to stronger competitiveness for Papaver during early growth.

Place, publisher, year, edition, pages
Wiley-Blackwell: No OnlineOpen, 2014
Keywords
crop; nutrient; phenotypic plasticity; poppy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-103286 (URN)10.1111/j.1442-1984.2012.00394.x (DOI)000328822800011 ()
Available from: 2014-01-17 Created: 2014-01-16 Last updated: 2017-12-06
Karlsson, L. & Dalbato, A. L. (2014). Enset - en mångsidig etiopisk gröda. Svensk Botanisk Tidskrift, 108(1), 34-41
Open this publication in new window or tab >>Enset - en mångsidig etiopisk gröda
2014 (English)In: Svensk Botanisk Tidskrift, ISSN 0039-646X, Vol. 108, no 1, p. 34-41Article in journal (Refereed) Published
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-111170 (URN)2-s2.0-84894772299 (Scopus ID)
Available from: 2014-10-10 Created: 2014-10-10 Last updated: 2017-12-05Bibliographically approved
Karlsson, L., Tamado, T., Dalbato, A. L. & Mikias, Y. (2013). Early growth and development of Ensete ventricosum (Musaceae) seedlings. Journal of Plant Sciences, 1(1), 11-17
Open this publication in new window or tab >>Early growth and development of Ensete ventricosum (Musaceae) seedlings
2013 (English)In: Journal of Plant Sciences, ISSN 2331-0723, Vol. 1, no 1, p. 11-17Article in journal (Refereed) Published
Abstract [en]

Enset is drought-tolerant, multi-purpose crop which has, since ancient times, been part of a sustainable cropping system with high agro-biodiversity in Ethiopia. It could improve independent food and livelihood security more than currently and in larger areas. Enset is traditionally propagated vegetatively, and plants are harvested before seed-set. There is request for new cultivars, and traits could be improved by conventional breeding through seeds and selection. However, there is no documented knowledge on seedling growth and development under field conditions. Therefore, we undertook the first study on enset seedling performance. Seeds originating from three cultivated and three wild plants were used. Over 400 newly germinated seeds were planted outdoors in an area with traditional enset cultivation. Seedlings were grown in local soil only or with supplement of cow manure or a locally available inorganic fertilizer (DAP). During the first three weeks after germination, there was no difference due to substrate, while cow manure was efficient and enough for further growth. Within 24 months, seedlings planted in the field and supplied with manure, reached 1.5-2 m pseudostem circumference and four out of ten flowered; much faster and stronger growth than expected. It is concluded that it would be suitable to breed enset through sexual propagation, utilizing the genetic variation for selection and following established procedures for new cultivars. However, seeds must not be distributed for direct use; clones developed from selected seedlings can efficiently be vegetatively propagated and distributed.

Place, publisher, year, edition, pages
Science Publishing Group, 2013
Keywords
Abyssinian Banana, Breeding, Drought Tolerant Crop, Ethiopia, False Banana, Perennial Crop, Propagation
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-103895 (URN)
Note

DOI does not work: 10.11648/j.jps.20130101.13

Available from: 2014-01-31 Created: 2014-01-31 Last updated: 2018-03-09Bibliographically approved
Dalbato, A. L., Kobza, F. & Karlsson, L. M. (2013). Effect of polyploidy and pollination methods on capsule and seed set of pansies (Viola x wittrockiana Gams). Horticultural Science, 40(1), 22-30
Open this publication in new window or tab >>Effect of polyploidy and pollination methods on capsule and seed set of pansies (Viola x wittrockiana Gams)
2013 (English)In: Horticultural Science, ISSN 0862-867X, E-ISSN 1805-9333, Vol. 40, no 1, p. 22-30Article in journal (Refereed) Published
Abstract [en]

Pansy, Viola x wittrockiana, is a popular ornamental plant. Effects of polyploidy on phenotype and four pollination methods on capsule and seed set were studied using ten octoploid (2n = 8x) and two hexadecaploid (2n = 16x) genotypes, originating from induced mutagenesis. Principal component analysis, using 19 phenotypic, phenological and physiological characteristics, revealed that hexadecaploids showed larger differences to the corresponding standard cultivars than octoploids. Number of seed per capsule was similar among genotypes. Capsule set with open pollination was 32-64%, with self-pollination by hand 18-49% and with cross-pollination by hand 14-43%, while no plant successfully set capsules with seeds under isolators if not pollinated manually. Thus, Viola x wittrockiana is self-compatible but requires an agent-mediation for successful pollination. The induced phenotypes were found stable over four generations. Hexadecaploids had more attractive phenotypes but fewer seeds than octoploids. However, variation in seed set enabled selection of plants with high fertility, and average seed set increased over generations. Thus, new varieties, fulfilling aesthetic criteria as well as economic and agronomic traits, can be bred from induced mutagenesis.

Place, publisher, year, edition, pages
Czech Academy of Agricultural Sciences, 2013
Keywords
garden pansy, fertility, self-compatibility, flow cytometry, phenotype
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-94332 (URN)000319024700004 ()
Note

Funding Agencies|Ministry of Education, Youth and Sports of the Czech Republic|MSM 435 100 02|

Available from: 2013-09-17 Created: 2013-06-24 Last updated: 2017-12-06Bibliographically approved
Mohammed, B., Gabel, M. & Karlsson, L. (2013). Nutritive values of the drought tolerant food and fodder crop enset. African Journal of Agricultural Research, 8(20), 2326-2333
Open this publication in new window or tab >>Nutritive values of the drought tolerant food and fodder crop enset
2013 (English)In: African Journal of Agricultural Research, ISSN 1991-637X, E-ISSN 1991-637X, Vol. 8, no 20, p. 2326-2333Article in journal (Refereed) Published
Abstract [en]

Enset (Ensete ventricosum) is a drought tolerant crop, traditionally grown in Ethiopia. It has manyusages: food, fodder, fibres and traditional medicine. Being perennial, enset improves local climate andsoil conditions. It could contribute to improved food security in several drought-prone parts of theworld. The aims of this study were to reveal the amino acids of enset corm, which can be cooked as aroot crop, and to increase the general knowledge regarding chemical composition and energy values ofdifferent enset fractions. Water content was high, 85 to 90%, which is beneficial when used as fodderduring dry periods. Enset corm contained 17 of 20 amino acids and had similar or higher concentrationthan potato of 12 of these. Leaves had 13% protein, among the highest available in Ethiopia, 20% crudefibre and 10% sugar; a good fodder and suitable for ensilage. The pseudostem, the main food source,was rich in soluble carbohydrates (80%) and starch (65%), but had low protein content (4%). An ensetbased diet should be supplemented with protein and complementary amino acids; for example frombeans, which are suitable to intercrop with enset.

Place, publisher, year, edition, pages
Academic Journals, 2013
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-103896 (URN)10.5897/AJAR12.1296 (DOI)
Available from: 2014-01-31 Created: 2014-01-31 Last updated: 2017-12-06Bibliographically approved
Karlsson, L., Tamado, T., Dalbato, A. & Mikias, Y. (2013). Seed morphology and germination of Ensete ventricosum (Musaceae). Seed science and technology, 41(3), 357-370
Open this publication in new window or tab >>Seed morphology and germination of Ensete ventricosum (Musaceae)
2013 (Swedish)In: Seed science and technology, ISSN 0251-0952, E-ISSN 1819-5717, Vol. 41, no 3, p. 357-370Article in journal (Refereed) Published
Abstract [en]

Ensete ventricosum is a drought-tolerant, multipurpose crop that has been cultivated in Ethiopia since ancienttimes. Traditional propagation is vegetative: each of hundreds of existing landraces is a clone. Improved cultivarsare needed, which may be achieved through sexual propagation and selection, but this requires knowledge ofseed germination. Ripe seeds from five wild and six cultivated plants were studied for seed morphology andgermination. Embryos were small in relation to seeds but did not elongate inside seeds before radicle protrusion.The shoot emerged a few days later and the scutellum (haustorium) expanded over several weeks followinggermination. The endosperm was utilised during early growth. Germination was 5-55% depending on plantsource; average germination did not differ significantly between seed lots of wild and cultivated origin. Overall,time to 50% of final germination was 8.5 weeks and no germination occurred after 28 weeks of incubation.Soaking in water for 0 to 96 hours or exposure to sulphuric acid, sodium hydroxide, ammonium nitrate, sodiumhypochlorite or hot water before the germination test had no significant effects on germination while scarificationor pre-treatment with 70% ethanol had significant negative effects. The seed coat is very hard; nevertheless wateruptake occurred, slowly but steadily, in intact seeds. We conclude that E. ventricosum has neither morphologicalnor physical seed dormancy. Further studies are needed to investigate possible physiological seed dormancy.

Place, publisher, year, edition, pages
International Seed Testing Association, 2013
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-102376 (URN)000330206300004 ()
Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2017-12-06
Walck, J. L., Karlsson, L. M., Milberg, P., Hidayati, S. N. & Kondo, T. (2012). Seed germination and seedling development ecology in world-wide populations of a circumboreal Tertiary relict. AoB Plants, pls007
Open this publication in new window or tab >>Seed germination and seedling development ecology in world-wide populations of a circumboreal Tertiary relict
Show others...
2012 (English)In: AoB Plants, ISSN 2041-2851, p. pls007-Article in journal (Refereed) Published
Abstract [en]

Background and aims Temperate forests are disjunct in the Northern Hemisphere, having become fragmented from the earlier widespread (Tertiary) boreotropical forest. We asked ‘What are the contemporary patterns of population variation in ecological traits of a Tertiary relict in a macroecological context?’. This issue underpins our understanding of variation in populations occurring in the same biome but on different continents.

Methodology We examined characters associated with root and shoot emergences among populations of Viburnum opulus in temperate forests of Asia, North America and Europe. This species has complex seedling emergence extending over several years and requiring various temperature cues.

Principal results Populations varied in germination responses and clustered into groups that were only partly related to varietal status. Whereas roots (at warm temperatures) and shoots (following a cold period) simultaneously emerged from seeds of all populations when simulated dispersal occurred in winter, they were delayed in some populations when dispersal occurred in summer.

Conclusions Viburnum opulus populations, some separated by 10 300 km, showed high similarity in seedling development and in germination phenology, and we suggest that stabilizing selection has played a key role in maintaining similar dormancy mechanisms. Nevertheless, there was some degree of variation in other germination characters, suggesting local adaptation.

Place, publisher, year, edition, pages
Oxford University Press, 2012
National Category
Ecology
Identifiers
urn:nbn:se:liu:diva-86584 (URN)10.1093/aobpla/pls007 (DOI)000325264100007 ()
Available from: 2012-12-19 Created: 2012-12-19 Last updated: 2014-10-08
Karlsson, L., Tamado, T. & Milberg, P. (2008). Inter-species comparison of seed dormancy and germination of six annual Asteraceae weeds in an ecological context. Seed Science Research, 18, 35-45
Open this publication in new window or tab >>Inter-species comparison of seed dormancy and germination of six annual Asteraceae weeds in an ecological context
2008 (English)In: Seed Science Research, ISSN 0960-2585, E-ISSN 1475-2735, Vol. 18, p. 35-45Article in journal (Refereed) Published
Abstract [en]

To understand germination timing in an ecological context, the response to environmental events that affect seed dormancy is central, and has to be combined with knowledge of germination responses to different circumstances. In this study, seed dormancy, germination, and emergence phenology of six annual co-occurring weedy Asteraceae species were investigated. Three pre-treatments (warm and cold stratification, and dry storage) were tested as possible dormancy affecting environmental events. Seeds were also sown outdoors. Species-specific differences were revealed in analyses. To facilitate general descriptions of dormancy patterns and germination preferences separately, condensed responses to the different possible dormancy affecting treatments and relative germination in different environments were plotted, giving species-specific patterns. Most species exhibited decreased dormancy to two or three pre-treatments. Dormancy was most effectively reduced by cold stratification for three species (Guizotia scabra, Parthenium hysterophorus, Verbesina encelioides), by warm stratification for two (Bidens pilosa, Galinsoga parviflora) and by dry storage for one (Tagetes minuta). All species germinated more when provided with light than in continuous darkness. Temperature levels most suitable for germination varied from low (15/5-20/10°C) for Verbesina encelioides to high (25/15-30/20°C) for Bidens pilosa. It is concluded that, even though the species have different dormancy patterns and germination preferences that suggest different possible distribution ranges, the species achieve similar emergence timing in the field in environments with a pronounced dry period after dispersal and small annual temperature fluctuations.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi, 2008
Keywords
Bidens pilosa, Galinsoga parviflora, Guizotia scabra ssp. schimperi, Parthenium hysterophorus, Tagetes minuta, tropical weeds, Verbesina encelioides
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-11879 (URN)10.1017/S0960258508888496 (DOI)
Note
Original publication: Laila M. Karlsson, T. Tamado and Per Milberg, Inter-species comparison of seed dormancy and germination of six annual Asteraceae weeds in an ecological context, 2008, Seed Science Research, (18), 35-45. http://dx.doi.org/10.1017/S0960258508888496. Copyright: Cambridge University Press, http://journals.cambridge.org/Available from: 2008-05-22 Created: 2008-05-22 Last updated: 2017-12-13
Karlsson, L. & Milberg, P. (2008). Variation within species and inter-species comparison of seed dormancy and germination of four annual Lamium species. Flora: Morphologie, Geobotanik, Oekophysiologie, 203(5), 409-420
Open this publication in new window or tab >>Variation within species and inter-species comparison of seed dormancy and germination of four annual Lamium species
2008 (English)In: Flora: Morphologie, Geobotanik, Oekophysiologie, ISSN 0367-2530, E-ISSN 1618-0585, Vol. 203, no 5, p. 409-420Article in journal (Refereed) Published
Abstract [en]

In an ecological context, knowledge of intra-species variation in dormancy and germination is necessary both for practical and theoretical reasons. We used four or five seed batches (replicates) of four closely related annuals co-occurring in arable fields in Sweden: Lamium amplexicaule, L. confertum, L. hybridum and L. purpureum. Seeds used for experiments stemmed from plants cultivated on two sites, each site harbouring one population of each species, thereby ensuring similar environmental history of seeds. Seeds were tested for germination when fresh and after three different pre-treatments (cold or warm stratification, or dry storage) for up to 24 weeks. Seeds were also sown outdoors. Despite substantial intra-species variation, there were clear differences between species. The general seed dormancy pattern, i.e. which environmental circumstances that affect dormancy, was similar for all species; dormancy reduction occurred during warm stratification or dry storage. Even though the response to warm stratification indicate a winter annual pattern, successful plants in Sweden were mostly spring emerged. Germination in autumn occurred, but plants survived winters poorly. Consequently, as cold stratification did not reduce dormancy, strong dormancy in combination with dormancy reduction during dry periods might explain spring germination. It is hypothesized that local adaptations occur through changes mainly in dormancy strength, i.e. how much effort that is needed to reduce dormancy; strong dormancy restrict the part of each seed batch that germinate during autumn, and thus risk winter mortality, in Sweden.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi, 2008
Keywords
Deadnettle, Lamiaceae, phenology, physiological dormancy, summer annual, winter annual
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-11806 (URN)10.1016/j.flora.2007.08.001 (DOI)
Note
Original publication: Laila M. Karlsson and Per Milberg, Variation within species and inter-species comparison of seed dormancy and germination of four annual Lamium species, 2008, Flora, (203), 5, 409-420. http://dx.doi.org/10.1016/j.flora.2007.08.001. Copyright: Elsevier B.V., http://www.elsevier.com/Available from: 2008-05-22 Created: 2008-05-22 Last updated: 2017-12-13
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