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Seed germination ecology of Conyza stricta Willd. and implications for management

Numerous cropping systems of the world are experiencing the emergence of new weed species in response to conservation agriculture. Conyza stricta Willd. is being a newly emerging weed of barley-based cropping systems in response to conservational tillage practices. Seed germination ecology of four p...

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Autores principales: Ali, Safdar, Khan, Fakhar Din, Ullah, Rehmat, Shah, Rahmat Ullah, Alamri, Saud, AlHarthi, Maeesh, Siddiqui, Manzer H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7771675/
https://www.ncbi.nlm.nih.gov/pubmed/33373381
http://dx.doi.org/10.1371/journal.pone.0244059
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author Ali, Safdar
Khan, Fakhar Din
Ullah, Rehmat
Shah, Rahmat Ullah
Alamri, Saud
AlHarthi, Maeesh
Siddiqui, Manzer H.
author_facet Ali, Safdar
Khan, Fakhar Din
Ullah, Rehmat
Shah, Rahmat Ullah
Alamri, Saud
AlHarthi, Maeesh
Siddiqui, Manzer H.
author_sort Ali, Safdar
collection PubMed
description Numerous cropping systems of the world are experiencing the emergence of new weed species in response to conservation agriculture. Conyza stricta Willd. is being a newly emerging weed of barley-based cropping systems in response to conservational tillage practices. Seed germination ecology of four populations (irrigated, rainfed, abandoned and ruderal habitats) was studied in laboratory and greenhouse experiments. The presence/absence of seed dormancy was inferred first, which indicated seeds were non-dormant. Seed germination was then recorded under various photoperiods, constant and alternating day/night temperatures, and pH, salinity and osmotic potential levels. Seedling emergence was observed from various seed burial depths. Seeds of all populations proved photoblastic and required 12-hour light/dark period for germination. Seeds of all populations germinated under 5–30°C constant temperature; however, peak germination was recorded under 17.22–18.11°C. Nonetheless, the highest germination was noted under 20/15°C alternating day/night temperature. Ruderal and irrigated populations better tolerated salinity and germinated under 0–500 mM salinity. Similarly, rainfed population proved more tolerant to osmotic potential than other populations. Seeds of all populations required neutral pH for the highest germination, whereas decline was noted in germination under basic and alkaline pH. Seedling emergence was retarded for seeds buried >2 cm depth and no emergence was recorded from >4 cm depth. These results add valuable information towards our understanding of seed germination ecology of C. stricta. Seed germination ability of different populations under diverse environmental conditions suspects that the species can present severe challenges in future if not managed. Deep seed burial along with effective management of the emerging seedlings seems a pragmatic option to manage the species in cultivated fields. However, immediate management strategies are needed for rest of the habitats.
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spelling pubmed-77716752021-01-08 Seed germination ecology of Conyza stricta Willd. and implications for management Ali, Safdar Khan, Fakhar Din Ullah, Rehmat Shah, Rahmat Ullah Alamri, Saud AlHarthi, Maeesh Siddiqui, Manzer H. PLoS One Research Article Numerous cropping systems of the world are experiencing the emergence of new weed species in response to conservation agriculture. Conyza stricta Willd. is being a newly emerging weed of barley-based cropping systems in response to conservational tillage practices. Seed germination ecology of four populations (irrigated, rainfed, abandoned and ruderal habitats) was studied in laboratory and greenhouse experiments. The presence/absence of seed dormancy was inferred first, which indicated seeds were non-dormant. Seed germination was then recorded under various photoperiods, constant and alternating day/night temperatures, and pH, salinity and osmotic potential levels. Seedling emergence was observed from various seed burial depths. Seeds of all populations proved photoblastic and required 12-hour light/dark period for germination. Seeds of all populations germinated under 5–30°C constant temperature; however, peak germination was recorded under 17.22–18.11°C. Nonetheless, the highest germination was noted under 20/15°C alternating day/night temperature. Ruderal and irrigated populations better tolerated salinity and germinated under 0–500 mM salinity. Similarly, rainfed population proved more tolerant to osmotic potential than other populations. Seeds of all populations required neutral pH for the highest germination, whereas decline was noted in germination under basic and alkaline pH. Seedling emergence was retarded for seeds buried >2 cm depth and no emergence was recorded from >4 cm depth. These results add valuable information towards our understanding of seed germination ecology of C. stricta. Seed germination ability of different populations under diverse environmental conditions suspects that the species can present severe challenges in future if not managed. Deep seed burial along with effective management of the emerging seedlings seems a pragmatic option to manage the species in cultivated fields. However, immediate management strategies are needed for rest of the habitats. Public Library of Science 2020-12-29 /pmc/articles/PMC7771675/ /pubmed/33373381 http://dx.doi.org/10.1371/journal.pone.0244059 Text en © 2020 Ali et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Ali, Safdar
Khan, Fakhar Din
Ullah, Rehmat
Shah, Rahmat Ullah
Alamri, Saud
AlHarthi, Maeesh
Siddiqui, Manzer H.
Seed germination ecology of Conyza stricta Willd. and implications for management
title Seed germination ecology of Conyza stricta Willd. and implications for management
title_full Seed germination ecology of Conyza stricta Willd. and implications for management
title_fullStr Seed germination ecology of Conyza stricta Willd. and implications for management
title_full_unstemmed Seed germination ecology of Conyza stricta Willd. and implications for management
title_short Seed germination ecology of Conyza stricta Willd. and implications for management
title_sort seed germination ecology of conyza stricta willd. and implications for management
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7771675/
https://www.ncbi.nlm.nih.gov/pubmed/33373381
http://dx.doi.org/10.1371/journal.pone.0244059
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