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Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands

The semiparasitic weed Pedicularis kansuensis Maxim. has rapidly spread in the alpine grasslands of northern China over the past twenty years and has caused serious ecological problems. In order to effectively halt the spread of this weed, a thorough understanding of the dormancy type and the seed-g...

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Autores principales: Hu, Jiedong, Li, Kaihui, Deng, Chengjun, Gong, Yanming, Liu, Yanyan, Wang, Lei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9268997/
https://www.ncbi.nlm.nih.gov/pubmed/35807730
http://dx.doi.org/10.3390/plants11131777
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author Hu, Jiedong
Li, Kaihui
Deng, Chengjun
Gong, Yanming
Liu, Yanyan
Wang, Lei
author_facet Hu, Jiedong
Li, Kaihui
Deng, Chengjun
Gong, Yanming
Liu, Yanyan
Wang, Lei
author_sort Hu, Jiedong
collection PubMed
description The semiparasitic weed Pedicularis kansuensis Maxim. has rapidly spread in the alpine grasslands of northern China over the past twenty years and has caused serious ecological problems. In order to effectively halt the spread of this weed, a thorough understanding of the dormancy type and the seed-germination ecology of P. kansuensis is required. We have conducted a series of experiments to investigate the effects of plant growth regulators (gibberellin (GA(3)) and strigolactone synthesis (GR24)), as well as different abiotic (temperature, light, cold stratification, and drought) and biotic (aqueous extracts of three native dominant plants) factors on the seed-germination characteristics of P. kansuensis. The seed-germination percentages ranged from 2% to 62% at all of the temperatures that were examined, with the highest occurring at 25/10 °C. The light conditions did not significantly affect the germination percentage. The seed germination was greatly improved after two to eight weeks of cold stratification. The seed germination decreased dramatically with an increasing polyethylene glycol (PEG-6000) concentration, from 55% to 0%, under 10% and 20% PEG-6000. The seed germination was improved at a proper concentration of GA(3), GR24, and the aqueous extracts of Festuca ovina L., Stipa purpurea L., and Leymus secalinus (Georgi) Tzvel. Furthermore, in the pot experiment, the seedling emergence of P. kansuensis was also improved by the cultivation of these three dominant grasses. These findings indicate that the dormancy type of P. kansuensis seeds is non-deep physiological dormancy, and such findings will help in paving the way for the creation of effective weed management strategies, based on a thorough knowledge of germination ecology.
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spelling pubmed-92689972022-07-09 Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands Hu, Jiedong Li, Kaihui Deng, Chengjun Gong, Yanming Liu, Yanyan Wang, Lei Plants (Basel) Article The semiparasitic weed Pedicularis kansuensis Maxim. has rapidly spread in the alpine grasslands of northern China over the past twenty years and has caused serious ecological problems. In order to effectively halt the spread of this weed, a thorough understanding of the dormancy type and the seed-germination ecology of P. kansuensis is required. We have conducted a series of experiments to investigate the effects of plant growth regulators (gibberellin (GA(3)) and strigolactone synthesis (GR24)), as well as different abiotic (temperature, light, cold stratification, and drought) and biotic (aqueous extracts of three native dominant plants) factors on the seed-germination characteristics of P. kansuensis. The seed-germination percentages ranged from 2% to 62% at all of the temperatures that were examined, with the highest occurring at 25/10 °C. The light conditions did not significantly affect the germination percentage. The seed germination was greatly improved after two to eight weeks of cold stratification. The seed germination decreased dramatically with an increasing polyethylene glycol (PEG-6000) concentration, from 55% to 0%, under 10% and 20% PEG-6000. The seed germination was improved at a proper concentration of GA(3), GR24, and the aqueous extracts of Festuca ovina L., Stipa purpurea L., and Leymus secalinus (Georgi) Tzvel. Furthermore, in the pot experiment, the seedling emergence of P. kansuensis was also improved by the cultivation of these three dominant grasses. These findings indicate that the dormancy type of P. kansuensis seeds is non-deep physiological dormancy, and such findings will help in paving the way for the creation of effective weed management strategies, based on a thorough knowledge of germination ecology. MDPI 2022-07-05 /pmc/articles/PMC9268997/ /pubmed/35807730 http://dx.doi.org/10.3390/plants11131777 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hu, Jiedong
Li, Kaihui
Deng, Chengjun
Gong, Yanming
Liu, Yanyan
Wang, Lei
Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands
title Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands
title_full Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands
title_fullStr Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands
title_full_unstemmed Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands
title_short Seed Germination Ecology of Semiparasitic Weed Pedicularis kansuensis in Alpine Grasslands
title_sort seed germination ecology of semiparasitic weed pedicularis kansuensis in alpine grasslands
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9268997/
https://www.ncbi.nlm.nih.gov/pubmed/35807730
http://dx.doi.org/10.3390/plants11131777
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