Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris
Fennoscandian plant communities dominated by the evergreen dwarf shrub Empetrum hermaphroditum Hagerup appear to have negative effects on forest regeneration. Effects of water extracts of leaves of E. hermaphroditum on the development and nitrogen uptake by roots and mycorrhizae (Paxillus involutus...
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1993
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crcansciencepubl:10.1139/b93-071 2024-09-30T14:34:52+00:00 Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris Nilsson, Marie-Charlotte Högberg, Peter Zackrisson, Olle Fengyou, Wang 1993 http://dx.doi.org/10.1139/b93-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/b93-071 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 71, issue 4, page 620-628 ISSN 0008-4026 journal-article 1993 crcansciencepubl https://doi.org/10.1139/b93-071 2024-09-05T04:11:15Z Fennoscandian plant communities dominated by the evergreen dwarf shrub Empetrum hermaphroditum Hagerup appear to have negative effects on forest regeneration. Effects of water extracts of leaves of E. hermaphroditum on the development and nitrogen uptake by roots and mycorrhizae (Paxillus involutus Batsch (Fr.)) of Scots pine (Pinus silvestris L.) were studied in a greenhouse experiment. Among seedlings that did not receive E. hermaphroditum extract, mycorrhizal plants grew better than nonmycorrhizal plants and also had a higher shoot to root ratio. Nitrogen uptake per unit root length was 3 times faster in mycorrhizal plants. The uptake of nitrogen was 92 ng∙day −1 per dichotomous tip as compared with 22 ng∙day −1 per nondichotomous root tip (mycorrhizal plants had both dichotomous and nondichotomous tips, whereas uninoculated plants almost exclusively had nondichotomous tips). A low concentration of extract impaired nitrogen uptake in both mycorrhizal and nonmycorrhizal plants. Uptake per unit root length was reduced to one-third and one-tenth in mycorrhizal and nonmycorrhizal plants, respectively. Calculated per dichotomous tip per day, the uptake of nitrogen was reduced to only 0.9 ng. Additions of extract also retarded increases in root length and the numbers of root tips, although less markedly, but the percentage of dichotomous tips was more strongly reduced. Empetrum hermaphroditum extract also strongly inhibited the growth of Paxillus involutus on modified Melin – Norkrans agar medium. The spread of mycorrhizal infection (as indicated by the percentage of dichotomous tips) and uptake of nutrients by roots and mycorrhizae were more sensitive to the extract than seed germination and radicle growth, which were demonstrated to be affected under field conditions. Key words: allelopathy, Empetrum hermaphroditum, forestry, mycorrhiza, nitrogen. Article in Journal/Newspaper Fennoscandian Canadian Science Publishing Melin ENVELOPE(-7.192,-7.192,62.161,62.161) Canadian Journal of Botany 71 4 620 628 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Fennoscandian plant communities dominated by the evergreen dwarf shrub Empetrum hermaphroditum Hagerup appear to have negative effects on forest regeneration. Effects of water extracts of leaves of E. hermaphroditum on the development and nitrogen uptake by roots and mycorrhizae (Paxillus involutus Batsch (Fr.)) of Scots pine (Pinus silvestris L.) were studied in a greenhouse experiment. Among seedlings that did not receive E. hermaphroditum extract, mycorrhizal plants grew better than nonmycorrhizal plants and also had a higher shoot to root ratio. Nitrogen uptake per unit root length was 3 times faster in mycorrhizal plants. The uptake of nitrogen was 92 ng∙day −1 per dichotomous tip as compared with 22 ng∙day −1 per nondichotomous root tip (mycorrhizal plants had both dichotomous and nondichotomous tips, whereas uninoculated plants almost exclusively had nondichotomous tips). A low concentration of extract impaired nitrogen uptake in both mycorrhizal and nonmycorrhizal plants. Uptake per unit root length was reduced to one-third and one-tenth in mycorrhizal and nonmycorrhizal plants, respectively. Calculated per dichotomous tip per day, the uptake of nitrogen was reduced to only 0.9 ng. Additions of extract also retarded increases in root length and the numbers of root tips, although less markedly, but the percentage of dichotomous tips was more strongly reduced. Empetrum hermaphroditum extract also strongly inhibited the growth of Paxillus involutus on modified Melin – Norkrans agar medium. The spread of mycorrhizal infection (as indicated by the percentage of dichotomous tips) and uptake of nutrients by roots and mycorrhizae were more sensitive to the extract than seed germination and radicle growth, which were demonstrated to be affected under field conditions. Key words: allelopathy, Empetrum hermaphroditum, forestry, mycorrhiza, nitrogen. |
format |
Article in Journal/Newspaper |
author |
Nilsson, Marie-Charlotte Högberg, Peter Zackrisson, Olle Fengyou, Wang |
spellingShingle |
Nilsson, Marie-Charlotte Högberg, Peter Zackrisson, Olle Fengyou, Wang Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris |
author_facet |
Nilsson, Marie-Charlotte Högberg, Peter Zackrisson, Olle Fengyou, Wang |
author_sort |
Nilsson, Marie-Charlotte |
title |
Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris |
title_short |
Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris |
title_full |
Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris |
title_fullStr |
Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris |
title_full_unstemmed |
Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris |
title_sort |
allelopathic effects by empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of pinus silvestris |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/b93-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/b93-071 |
long_lat |
ENVELOPE(-7.192,-7.192,62.161,62.161) |
geographic |
Melin |
geographic_facet |
Melin |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Canadian Journal of Botany volume 71, issue 4, page 620-628 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b93-071 |
container_title |
Canadian Journal of Botany |
container_volume |
71 |
container_issue |
4 |
container_start_page |
620 |
op_container_end_page |
628 |
_version_ |
1811638329124323328 |