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Impact of temperature and germination time on the success of a C4 weed in a C3 crop: Amaranthus retroflexus and spring barley

Hyvönen, Terho (2011) Impact of temperature and germination time on the success of a C4 weed in a C3 crop: Amaranthus retroflexus and spring barley. Agricultural and Food Science, 20 (2), pp. 183-189.

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Online at: http://www.mtt.fi/afs/pdf/mtt-afs-v20n2p183.pdf

Summary

Elevation in temperatures due to climate change could promote the invasion by C4 weed species of arable fields in the boreal region, which are dominated by C3 crops. The success of Amaranthus retroflexus L. (a C4 weed) in spring barley (a C3 crop) was studied at current and elevated temperatures (3°C difference) in a greenhouse experiment in southern Finland. The competition treatments included no competition and four levels of competition with barley, differing in terms of germination time. The success of A. retroflexus was measured as growth (height and biomass) and seed production (number and biomass). Elevation in temperature enhanced seed production of A. retroflexus, but the impact on growth was minor (only difference in plant height in one treatment). The growth and seed production of A. retroflexus in competition with barley was minimal although the growth of barley decreased with the rise in temperature. The results indicate that climate change could improve growth of a C4 weed such as A. retroflexus, but it is unlikely to succeed in spring barley.


EPrint Type:Journal paper
Keywords: arable weed, climate change, seed production, species invasion
Subjects: Crop husbandry > Weed management
Research affiliation: Finland > MTT Agrifood Research
ISSN:1795-1895
Deposited By: Koistinen, Riitta
ID Code:19402
Deposited On:16 Sep 2011 10:45
Last Modified:16 Sep 2011 10:45
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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