Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack.
Fire affects not only the vegetation but also the seedbank, the main propagule reservoir of Piptochaetium napostaense. Despite being a well-known species, there is little information of the effect of fire temperatures on the germination and emergence of P. napostaense seeds. In this study, we evaluated the germination and emergence of P. napostaense in response to temperatures and exposure times similar to those observed during a fire. Seeds of P. napostaense were exposed to different treatments that resulted from the combination of six temperature levels (20°C, 70°C, 90°C, 120°C, 140°C and 170°C) and three exposure times (5, 10 and 20 minutes). Results showed that moderate temperaturas (70°C, 90°C) stimulated the germination of P. napostaense and the combination of high temperatures and prolonged exposure times reduced seed viability, and affected seedlings emergence and biomass. Results indicate that germination success of P. napostaense seeds depends on both temperature and exposure time.
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oai:ojs.cerac.unlpam.edu.ar:article45372023-12-01T14:35:11Z Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. Influencia de la temperatura y el tiempo de exposición sobre la germinación y la emergencia de Piptochaetium napostaense (Speg.) Hack. Avila, Patricia Kin, Alicia G. Morici, Ernesto F. A. Piptochaetium napostaense emergence dormancy heat shock fire biomass Piptochaetium napostaense emergencia dormición calor fuego biomasa Fire affects not only the vegetation but also the seedbank, the main propagule reservoir of Piptochaetium napostaense. Despite being a well-known species, there is little information of the effect of fire temperatures on the germination and emergence of P. napostaense seeds. In this study, we evaluated the germination and emergence of P. napostaense in response to temperatures and exposure times similar to those observed during a fire. Seeds of P. napostaense were exposed to different treatments that resulted from the combination of six temperature levels (20°C, 70°C, 90°C, 120°C, 140°C and 170°C) and three exposure times (5, 10 and 20 minutes). Results showed that moderate temperaturas (70°C, 90°C) stimulated the germination of P. napostaense and the combination of high temperatures and prolonged exposure times reduced seed viability, and affected seedlings emergence and biomass. Results indicate that germination success of P. napostaense seeds depends on both temperature and exposure time. El fuego no sólo afecta a la vegetación sino también al suelo donde se encuentra el banco de semillas, principal reservorio de propágulos con que cuenta Piptochaetium napostaense (Speg.) Hack. (“flechilla negra”) para su mantenimiento y regeneración. A pesar de ser una especie forrajera estudiada, es escasa la información del efecto de las temperaturas alcanzadas durante un incendio sobre la germinación de las semillas y la emergencia de plántulas de flechilla negra. El objetivo de este trabajo fue evaluar la respuesta de la germinación y la emergencia de esta gramínea a diferentes temperaturas y tiempos de exposición simulando los efectos de un fuego. Las semillas fueron expuestas a diferentes tratamientos que resultaron de la combinación de seis temperaturas (20°C, 70°C, 90°C, 120°C, 140°C y 170°C) y tres tiempos de exposición (5, 10 y 20 min.). Los resultados mostraron que las temperaturas de 70°C y 90°C estimularon la germinación y la combinación temperaturas altas-tiempos de exposición de 10 y 20 min. redujeron la viabilidad de las semillas, afectaron la emergencia y la producción de biomasa de las plántulas de P. napostaense. De los resultados obtenidos podría concluirse que el éxito de la germinación de las semillas de P. napostaense dependerá de la combinación temperatura-tiempo. Facultad de Agronomía 2020-03-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://cerac.unlpam.edu.ar/index.php/semiarida/article/view/4537 Semiárida; Vol. 21 (2010); 3-15 2408-4077 2362-4337 spa https://cerac.unlpam.edu.ar/index.php/semiarida/article/view/4537/4698 Derechos de autor 2020 Patricia Avila, Alicia G. Kin, Ernesto F. A. Morici |
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author |
Avila, Patricia Kin, Alicia G. Morici, Ernesto F. A. |
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Avila, Patricia Kin, Alicia G. Morici, Ernesto F. A. Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. |
author_facet |
Avila, Patricia Kin, Alicia G. Morici, Ernesto F. A. |
author_sort |
Avila, Patricia |
title |
Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. |
title_short |
Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. |
title_full |
Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. |
title_fullStr |
Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. |
title_full_unstemmed |
Influence of temperature and the exposure time on the germination and seedling emergence of Piptochaetium napostaense (Speg.) Hack. |
title_sort |
influence of temperature and the exposure time on the germination and seedling emergence of piptochaetium napostaense (speg.) hack. |
description |
Fire affects not only the vegetation but also the seedbank, the main propagule reservoir of Piptochaetium napostaense. Despite being a well-known species, there is little information of the effect of fire temperatures on the germination and emergence of P. napostaense seeds. In this study, we evaluated the germination and emergence of P. napostaense in response to temperatures and exposure times similar to those observed during a fire. Seeds of P. napostaense were exposed to different treatments that resulted from the combination of six temperature levels (20°C, 70°C, 90°C, 120°C, 140°C and 170°C) and three exposure times (5, 10 and 20 minutes). Results showed that moderate temperaturas (70°C, 90°C) stimulated the germination of P. napostaense and the combination of high temperatures and prolonged exposure times reduced seed viability, and affected seedlings emergence and biomass. Results indicate that germination success of P. napostaense seeds depends on both temperature and exposure time. |
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Facultad de Agronomía |
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2020 |
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https://cerac.unlpam.edu.ar/index.php/semiarida/article/view/4537 |
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