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Dormancy in reproductive vegetative buds in creeping perennials dominating the agricultural weed flora in Scandinavia

Liew, Josefine (2013). Dormancy in reproductive vegetative buds in creeping perennials dominating the agricultural weed flora in Scandinavia. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:5
ISBN 978-91-576-7762-4
[Doctoral thesis]

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Dormancy, which is the inability to initiate normal growth under otherwise favourable conditions, is an adaptation to escape sprouting prior to seasonal cold temperatures and/or drought in areas where winters are harsh or summers dry. Dormancy in woody perennials of northern temperate areas is, in general, induced by photoperiodic and/or temperature changes, and released after prolonged exposure to chilling. Besides being species specific, northern ecotypes are usually more sensitive to inductive signals than are southern ecotypes (in cold temperate areas). Dormancy in perennial weeds has been little studied, but might influence the effect of weed control measures. These often
involve repeated fragmentation of the roots or rhizomes to stimulate re-sprouting, thus reducing the storage of nutrient reserves. Such measures would be a waste of energy
and time if conducted during a period of dormancy. Furthermore, herbicide applications might be less efficient, since there is no or little transport to reproductive organs.

In this thesis, the autumnal growth pattern of five perennial weeds, which all propagate vegetatively from underground adventitious or axillary buds, has been studied. In an outdoor pot experiment, emergence from defoliated plants with undisturbed underground systems was followed at two weeks intervals from late July to late January/April, for 2 years. During the second year, sprouting capacity from root and rhizome fragments was also tested. Emergence was impaired in Cirsium arvense, Equisetum arvense, Sonchus arvensis and Tussilago farfara during a period in September-October. This seasonality was, however, not preserved in C. arvense root buds after fragmentation of the root system. Fragmented rhizomes of Elytrigia repens, originating from southern Sweden, sprouted less readily in September-October. The shoot-to-rhizome ratio of this species was lowest during the same period.

A climate chamber experiment suggested a photoperiodic control of sprouting from fragments of S. arvensis, with least sprouting in short photoperiods (12 h of light)
combined with high temperature. None of the 12 combinations of photoperiods and temperatures used induced dormancy in C. arvense. In neither of the experiments could timing of dormancy onset be attributed to the latitudinal origin of the plants.

Authors/Creators:Liew, Josefine
Title:Dormancy in reproductive vegetative buds in creeping perennials dominating the agricultural weed flora in Scandinavia
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2013
Number of Pages:69
I.Andersson L, Boström U, Forkman J, Hakman I, Liew J & Magnuski E. Sprouting capacity from intact root systems of Cirsium arvense and Sonchus arvensis decreases in autumn. Weed Research (in press).
II.Boström U, Andersson L, Forkman J, Hakman I, Liew J & Magnuski E. Seasonal variation in sprouting capacity from intact rhizome systems of three perennial weeds (submitted manuscript).
III.Liew J, Andersson L, Boström U, Forkman J, Hakman I & Magnuski E (2012). Influence of photoperiod and temperature on sprouting capacity of Cirsium arvense and Sonchus arvensis root buds. Weed Research 52(5), 449-457.
IV.Liew J, Andersson L, Boström U, Forkman J, Hakman I & Magnuski E. Regeneration capacity from roots and rhizomes of five herbaceous perennials as affected by time of fragmentation (submitted manuscript).
Place of Publication:Uppsala
Publisher:Dept. of Crop Production Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7762-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F62 Plant physiology - Growth and development
F Plant production > F63 Plant physiology - Reproduction
H Protection of plants and stored products > H60 Weeds and weed control
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:perennial weeds, roots, rhizomes, dormancy, sprouting, asexual reproduction, weed control, organic agriculture
Keywords:dormancy, root bud, vegetative reproduction, weed biology, organic agriculture, perennial weed, weed control
Permanent URL:
ID Code:9459
Department:(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: Josefine Liew
Deposited On:22 Feb 2013 09:13
Metadata Last Modified:14 Dec 2014 15:50

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