lnu.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Hakman, Inger
Publications (10 of 55) Show all publications
Liew, J., Andersson, L., Boström, U., Forkman, J., Hakman, I. & Magnuski, E. (2013). Regeneration capacity from buds on roots and rhizomes in five herbaceous perennials as affected by time of fragmentation. Plant Ecology, 214(10), 1199-1209
Open this publication in new window or tab >>Regeneration capacity from buds on roots and rhizomes in five herbaceous perennials as affected by time of fragmentation
Show others...
2013 (English)In: Plant Ecology, ISSN 1385-0237, E-ISSN 1573-5052, Vol. 214, no 10, p. 1199-1209Article in journal (Refereed) Published
Abstract [en]

Variation in seasonal sprouting pattern from roots and rhizomes of perennial herbaceous plants influence the success of plant proliferation ability, invasiveness and escape from weed control measures. The latter often rely on methods, which repeatedly fragment the underground system, thereby trigger adventitious and axillary buds to sprout, and consequently reduce the amount of stored energy. If carried out at times when no re-growth occurs, treatments will have little effect on weed populations, but cost much in terms of labour and energy. The purpose of this experiment was to determine the seasonal variation in bud sprouting capacity after fragmentation. Five troublesome perennial weed species, collected in northern and southern Sweden, were grown outdoors in Uppsala, Sweden (N 59°49′, E 17°39′), from May 2009 to January 2010. Cut root and rhizome fragments, taken at two weeks intervals from July to January, were used to evaluate bud sprouting capacity, which was statistically analyzed using generalized additive models. In Elytrigia repens from southern Sweden and Sonchus arvensis sprouting capacity was significantly impaired during a period from September to November. In Equisetum arvense and Tussilago farfara sprouting was low between July and November where after it increased. In contrast, Cirsium arvense and E. repens from northern Sweden sprouted readily throughout the period. Except for E. repens, a model by populations was significantly better than one based on latitudinal origin. The result suggests a species-specific timing of treatments in weed management, avoiding the non-effective autumn period for E. arvense, S. arvensis and T. farfara, and in some cases in E. repens.

National Category
Biological Sciences
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-27732 (URN)10.1007/s11258-013-0244-4 (DOI)000324498500001 ()2-s2.0-84884416865 (Scopus ID)
Projects
Dormancy in reproductive vegetative buds in creeping perennials dominating the agricultural weed flora in Scandinavica
Funder
Formas, 2007-1681
Available from: 2013-08-01 Created: 2013-08-01 Last updated: 2017-12-06Bibliographically approved
Boström, U., Andersson, L., Forkman, J., Hakman, I., Liew, J. & Magnuski, E. (2013). Seasonal variation in sprouting capacity from intact rhizome systems of three perennial weeds.. Weed research (Print), 53(5), 387-398
Open this publication in new window or tab >>Seasonal variation in sprouting capacity from intact rhizome systems of three perennial weeds.
Show others...
2013 (English)In: Weed research (Print), ISSN 0043-1737, E-ISSN 1365-3180, Vol. 53, no 5, p. 387-398Article in journal (Refereed) Published
Abstract [en]

The three rhizomatous perennials Elytrigia repens, Equisetum arvense and Tussilago farfara are all problematic in Scandinavian agriculture, due to their low susceptibility to soil cultivation. While repeated soil tillage is a fundamental part of the integrated control of these species, it is highly energy consuming and inefficient during periods when little sprout regrowth occurs. Substituting cultivation with mowing will reduce the environmental impact and labour costs, but its efficiency will still depend on the capacity of plants to sprout. Therefore, we studied the seasonal pattern in emergence and rhizome biomass allocation from July to April in six populations for each of the species. Plants were grown outdoors in pots buried in soil and exhumed at regular intervals in a two-year experiment. In all three species, biomass allocation to rhizomes continued until late in the autumn. Emergence was severely impaired in E.arvense and T.farfara in September-October, while in E.repens, there was no such reduction in the number of emerged shoots. However, in the latter species, the shoot/rhizome ratio decreased and remained low until the plants had been exposed to a period of low temperatures. The increase in shoot/rhizome ratio for E.repens coincided with the resumed capacity to emerge for E.arvense and T.farfara. These results imply that there is no need to repeat a defoliation of E.arvense and T.farfara, if carried out in September-October. However, removal of the aerial plant parts early in the autumn is important to interrupt the upload of storage compounds to the rhizome systems of all species.

Keywords
endodormancy; common couch; field horsetail; coltsfoot; vegetative reproduction; weed biology
National Category
Agricultural Science Botany
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-27733 (URN)10.1111/wre.12035 (DOI)000323838800011 ()2-s2.0-84883446034 (Scopus ID)
Available from: 2013-08-01 Created: 2013-08-01 Last updated: 2017-12-06Bibliographically approved
Andersson, L., Bostrom, U., Forkman, J., Hakman, I., Liew, J. & Magnuski, E. (2013). Sprouting capacity from intact root systems of Cirsium arvense and Sonchus arvensis decrease in autumn. Weed research (Print), 53(3), 183-191
Open this publication in new window or tab >>Sprouting capacity from intact root systems of Cirsium arvense and Sonchus arvensis decrease in autumn
Show others...
2013 (English)In: Weed research (Print), ISSN 0043-1737, E-ISSN 1365-3180, Vol. 53, no 3, p. 183-191Article in journal (Refereed) Published
Abstract [en]

Perennial weeds are often controlled by mechanical means, which aim at stimulating axillary and adventitious buds to sprout. This happens when the apical dominance of the main shoot is removed by defoliation or when the underground system is fragmented. By repeating the measures, the result is a depletion of storage compounds, which weakens the plants and reduces their capacity to grow and reproduce. However, timing is critical. Earlier research has indicated that emergence from fragments of Sonchus arvensis cease during a period in autumn, while the seasonal pattern of sprouting in Cirsium arvense appears to be inconsistent. We studied the emergence pattern of defoliated plants with undisturbed root systems, from late summer to early spring. Potted plants grown outdoors were exhumed at regular intervals, put under forcing conditions for 4weeks, after which shoots above and below soil level were counted and weighed together with the remaining root systems. In both species, the number and weight of emerged shoots decreased during a period in the autumn. In C.arvense, underground shoots were constantly produced during the same period, while fewer underground shoots were present in S.arvensis. For the latter species, apical dominance does not fully explain the effect; thus, endodormancy might be involved. Root weight increased until withering and did not explain the lack of emergence. Our results suggest an impaired sprouting capacity of undisturbed root systems of C.arvense and S.arvensis during SeptemberOctober, which has implications for the timing and method of control of these species.

Keywords
creeping thistle, perennial sowthistle, dormancy, vegetative reproduction, mechanical weed control, root growth
National Category
Biological Sciences
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-25582 (URN)10.1111/wre.12013 (DOI)000318350500005 ()2-s2.0-84877147683 (Scopus ID)
Funder
Formas
Available from: 2013-05-08 Created: 2013-05-08 Last updated: 2017-12-06Bibliographically approved
Liew, J., Andersson, L., Boström, U., Forkman, J., Hakman, I. & Magnuski, E. (2012). Influence of temperature and photoperiod on sprouting capacity of Cirsium arvense and Sonchus arvensis root buds. Weed research (Print), 52(5), 449-457
Open this publication in new window or tab >>Influence of temperature and photoperiod on sprouting capacity of Cirsium arvense and Sonchus arvensis root buds
Show others...
2012 (English)In: Weed research (Print), ISSN 0043-1737, E-ISSN 1365-3180, Vol. 52, no 5, p. 449-457Article in journal (Refereed) Published
Abstract [en]

Influence of temperature and photoperiod on sprouting capacity of Cirsium arvense and Sonchus arvensis root buds. Weed Research.52, 449-457. Summary Timing of treatment is a key to successful and sustainable weed management. For perennial weeds, highly energy-demanding, repeated stubble cultivation or tillage is a common strategy in organic agriculture. The fragmentation of underground material stimulates root buds to grow and, if repeated, significantly reduces the energy and nutrient resources of the roots. However, the effect might differ depending on variation in sprouting over the season and among species. Here, we studied the impact of different photoperiods and temperatures on sprouting capacity of root buds of Cirsium arvense and Sonchus arvensis in a climate chamber experiment. Two populations of each species, collected in northern and southern Sweden, were used. Plants were exposed to long (18 h), short (12 h) or decreasing (from 18 to 8 h) photoperiods in combinations with high (18/12 degrees C for 16/8 h), low (12/6 degrees C), decreasing (from 21 to 5 degrees C in 4 weeks) or constant high (16 degrees C) temperatures. Sprouting capacity was evaluated based on the proportion of sprouting buds from short root fragments. Neither temperature nor photoperiod affected root bud sprouting in C. arvense, while in S. arvensis, photoperiod seemed to regulate sprouting capacity. The proportion of sprouted buds decreased in short photoperiods, especially if combined with high temperature. In northern conditions, this suggests that weeding strategies based on fragmentation of the root system of S. arvensis will have low efficiency if the autumns are warm.

Keywords
dormancy, perennial sow-thistle, creeping thistle, weed management, organic agriculture, endodormancy
National Category
Botany Agricultural Science
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-19114 (URN)10.1111/j.1365-3180.2012.00936.x (DOI)2-s2.0-84865716410 (Scopus ID)
Projects
Dormancy in reproductive vegetative buds in creeping perennials dominating the agricultural weed flora in Scandinavica
Funder
Swedish Research Council Formas, 2007-1681
Available from: 2012-05-30 Created: 2012-05-30 Last updated: 2017-12-07Bibliographically approved
Liew, J., Andersson, L., Boström, U., Forkman, J., Hakman, I. & Magnuski, E. (2011). Seasonal variation and control of sprouting capacity of Cirsium arvense and Sonchus arvensis root buds. In: NJF Report Vol 7 No 9 2011. (Sem 446) Risk assessment/risk management, forecasting pests and diseases of field crops in a changing climate: . Paper presented at NJF seminar 446: Risk assessment/risk management, forecasting pests and diseases of field crops in a changing climate. Control strategies for pests, diseases and weeds. 30 November – 1 December 2011, Kristianstad, Sweden.
Open this publication in new window or tab >>Seasonal variation and control of sprouting capacity of Cirsium arvense and Sonchus arvensis root buds
Show others...
2011 (English)In: NJF Report Vol 7 No 9 2011. (Sem 446) Risk assessment/risk management, forecasting pests and diseases of field crops in a changing climate, 2011Conference paper, Published paper (Refereed)
National Category
Agricultural Science
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-19115 (URN)
Conference
NJF seminar 446: Risk assessment/risk management, forecasting pests and diseases of field crops in a changing climate. Control strategies for pests, diseases and weeds. 30 November – 1 December 2011, Kristianstad, Sweden
Available from: 2012-05-30 Created: 2012-05-30 Last updated: 2015-02-11Bibliographically approved
Hallberg, H., Palovaara, J. & Hakman, I. (2010). Auxin polar transport and PIN localization pattern during conifer embryo development. Paper presented at FESPB 2010 Spain.
Open this publication in new window or tab >>Auxin polar transport and PIN localization pattern during conifer embryo development
2010 (English)Conference paper, Published paper (Other academic)
National Category
Botany
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-6084 (URN)
Conference
FESPB 2010 Spain
Available from: 2010-06-12 Created: 2010-06-12 Last updated: 2011-06-13Bibliographically approved
Palovaara, J., Hallberg, H., Stasolla, C. & Hakman, I. (2010). Comparative expression pattern analysis of WUSCHEL-related homeobox 2 (WOX2) and WOX8⁄9 in developing seeds and somatic embryos of the gymnosperm Picea abies. New Phytologist, 188(1), 122-135
Open this publication in new window or tab >>Comparative expression pattern analysis of WUSCHEL-related homeobox 2 (WOX2) and WOX8⁄9 in developing seeds and somatic embryos of the gymnosperm Picea abies
2010 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 188, no 1, p. 122-135Article in journal (Refereed) Published
Abstract [en]

In seed plants, current knowledge concerning embryonic pattern formation by polar auxin transport (PAT) and WUSCHEL-related homeobox (WOX) gene activity is primarily derived from studies on angiosperms, while less is known about these processes in gymnosperms. In view of the differences in their embryogeny, and the fact that somatic embryogenesis is used for mass propagation of conifers, a better understanding of embryo development is vital.

The expression patterns of PaWOX2 and PaWOX8/9 were followed with quantitative reverse transcription–polymerase chain reaction (qRT-PCR) and in situ hybridization (ISH) during seed and somatic embryo development in Norway spruce (Picea abies), and in somatic embryos treated with the PAT inhibitor N-1-naphthylphthalamic acid (NPA).

Both PaWOX2 and PaWOX8/9 were highly expressed at the early growth stages of zygotic and somatic embryos, and shared a similar expression pattern over the entire embryo. At later embryo stages, high expression of PaWOX8/9 became restricted to cotyledon primordia, epidermis, procambium and root apical meristem (RAM), which became most evident in NPA-treated somatic embryos, while expression of PaWOX2 was much lower.

Our results suggest an ancestral role of WOX in seed plant embryo development, and strengthen the proposed connection between PAT, PIN-FORMED (PIN) and WOX in the regulation of embryo patterning in seed plants.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Keywords
archegonia, conifer, in situ hybridization, N-1-naphthylphthalamic acid (NPA), PCR, polar auxin transport (PAT), rocambium, transcription factor
National Category
Botany
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:hik:diva-2929 (URN)10.1111/j.1469-8137.2010.03336.x (DOI)2-s2.0-77956295063 (Scopus ID)
Available from: 2010-03-01 Created: 2010-03-01 Last updated: 2017-12-12Bibliographically approved
Palovaara, J., Hallberg, H., Stasolla, C., Luit, B. & Hakman, I. (2010). Expression of a gymnosperm PIN homologous gene correlates with auxin immunolocalization pattern at cotyledon formation and in demarcation of the procambium during Picea abies somatic embryo development and in seedling tissues. Tree Physiology, 30(4), 479-489
Open this publication in new window or tab >>Expression of a gymnosperm PIN homologous gene correlates with auxin immunolocalization pattern at cotyledon formation and in demarcation of the procambium during Picea abies somatic embryo development and in seedling tissues
Show others...
2010 (English)In: Tree Physiology, ISSN 0829-318X, E-ISSN 1758-4469, Vol. 30, no 4, p. 479-489Article in journal (Refereed) Published
Abstract [en]

In seed plants, the body organization is established during embryogenesis and is uniform across gymnosperms and angiosperms, despite differences during early embryogeny. Evidence from angiosperms implicates the plant hormone auxin and its polar transport, mainly established by the PIN family of auxin efflux transporters, in the patterning of embryos. Here, PaPIN1 from Norway spruce (Picea abies [L.] Karst.), a gene widely expressed in conifer tissues and organs, was characterized and its expression and localization patterns were determined with reverse transcription polymerase chain reaction and in situ hybridization during somatic embryo development and in seedlings. PaPIN1 shares the predicted structure of other PIN proteins, but its central hydrophilic loop is longer than most PINs. In phylogenetic analyses, PaPIN1 clusters with Arabidopsis thaliana (L.) Heynh. PIN3, PIN4 and PIN7, but its expression pattern also suggests similarity to PIN1. The PaPIN1 expression signal was high in the protoderm of pre-cotyledonary embryos, but not if embryos were pre-treated with the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). This, together with a high auxin immunolocalization signal in this cell layer, suggests a role of PaPIN1 during cotyledon formation. At later stages, high PaPIN1 expression was observed in differentiating procambium, running from the tip of incipient cotyledons down through the embryo axis and to the root apical meristem (RAM), although the mode of RAM specification in conifer embryos differs from that of most angiosperms. Also, the PaPIN1 in situ signal was high in seedling root tips including root cap columella cells. The results thus suggest that PaPIN1 provides an ancient function associated with auxin transport and embryo pattern formation prior to the separation of angiosperms and gymnosperms, in spite of some morphological differences.

Place, publisher, year, edition, pages
Oxford University Press, 2010
Keywords
conifer, embryo patterning, in situ hybridization, meristem, NPA, polar auxin transport (PAT), protoderm, RT-PCR
National Category
Botany
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:hik:diva-2928 (URN)10.1093/treephys/tpp126 (DOI)000276305100005 ()2-s2.0-77950538656 (Scopus ID)
Available from: 2010-03-01 Created: 2010-03-01 Last updated: 2017-12-12Bibliographically approved
Liew, J., Andersson, L., Boström, U., Hakman, I., Magnuski, E. & Milberg, P. (2010). Seasonal variation in sprouting capacity from underground root buds of Cirsium arvense and Sonchus arvensis. In: Proceedings 15th European Weed Research Society Symposium, Kaposvár. Paper presented at 15th European Weed Research Society Symposium, Kaposvár (pp. 52).
Open this publication in new window or tab >>Seasonal variation in sprouting capacity from underground root buds of Cirsium arvense and Sonchus arvensis
Show others...
2010 (English)In: Proceedings 15th European Weed Research Society Symposium, Kaposvár, 2010, p. 52-Conference paper, Published paper (Refereed)
National Category
Agricultural Sciences
Research subject
Natural Science, Cell and Organism Biology
Identifiers
urn:nbn:se:lnu:diva-19117 (URN)
Conference
15th European Weed Research Society Symposium, Kaposvár
Available from: 2012-05-30 Created: 2012-05-30 Last updated: 2013-01-14Bibliographically approved
Andersson, L., Boström, U., Liew, J., Karlsson, L., Magnuski, E., Milberg, P. & Hakman, I. (2010). Spirehvile i rødder og rhizomer i de vigtigste rodukrudtsarter - resultater fra svenske forsøg.. In: Proceedings Plantekongres 2010. Paper presented at Plantekongres 2010,12-14 januari 2010, Herning, Danmark (pp. 330-331).
Open this publication in new window or tab >>Spirehvile i rødder og rhizomer i de vigtigste rodukrudtsarter - resultater fra svenske forsøg.
Show others...
2010 (Danish)In: Proceedings Plantekongres 2010, 2010, p. 330-331Conference paper, Published paper (Other academic)
National Category
Agricultural Sciences
Identifiers
urn:nbn:se:lnu:diva-19116 (URN)
Conference
Plantekongres 2010,12-14 januari 2010, Herning, Danmark
Available from: 2012-05-30 Created: 2012-05-30 Last updated: 2013-01-14Bibliographically approved
Organisations

Search in DiVA

Show all publications