Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat
Two possible sources of resistance to pre-harvest sprouting were evaluated in quinoa. They showed dormancy at harvest and significant variations in dormancy level in response to environmental conditions experienced during seed development. The aims of this work were to evaluate the importance of seed coats in the regulation of dormancy in this species, to investigate possible mechanisms of action and to assess association of seed coat properties with changes in dormancy level caused by the environment. Accessions Chadmo and 2-Want were grown under field conditions on different sowing dates during 2 years. Seed coats were manipulated and seed germination was evaluated at different temperatures. Seed coat perforation before incubation led to faster dormancy loss in both accessions. This effect decreased with delayed sowing date, and seeds expressed a level of dormancy not imposed by coats. This suggests the presence of embryo dormancy in the genus Chenopodium . Seeds of the accession 2-Want had a significantly thinner seed coat at later sowing dates, associated with a decreasing coat-imposed dormancy, but this pattern was not detected in Chadmo. The seed coat acts as a barrier to the release of endogenous abscisic acid (ABA) in quinoa, suggested by the increase in germination and a higher amount of ABA leached from perforated seeds. ABA is able to leach from seeds with an intact seed coat, suggesting that differences in seed coat thickness may allow the leakage of different amounts of ABA. This mechanism may contribute to the observed differences in dormancy level, either between sowing dates or between accessions.
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Format: | info:ar-repo/semantics/artículo biblioteca |
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2015-05
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Subjects: | Chenopodium Quinoa, Dormición, Brotes, Fecha de Siembra, Dormancy, Shoots, Sowing Date, Quinoa, Precosecha, Latencia, |
Online Access: | http://hdl.handle.net/20.500.12123/1202 https://www.cambridge.org/core/journals/seed-science-research/article/structural-aspects-of-dormancy-in-quinoa-chenopodium-quinoa-importance-and-possible-action-mechanisms-of-the-seed-coat/5AF8E238EAD187329255B60AFF296A4F |
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oai:localhost:20.500.12123-12022018-06-26T12:53:30Z Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat Ceccato, Diana Valeria Bertero, Héctor Daniel Batlla, Diego Galati, Beatriz Gloria Chenopodium Quinoa Dormición Brotes Fecha de Siembra Dormancy Shoots Sowing Date Quinoa Precosecha Latencia Two possible sources of resistance to pre-harvest sprouting were evaluated in quinoa. They showed dormancy at harvest and significant variations in dormancy level in response to environmental conditions experienced during seed development. The aims of this work were to evaluate the importance of seed coats in the regulation of dormancy in this species, to investigate possible mechanisms of action and to assess association of seed coat properties with changes in dormancy level caused by the environment. Accessions Chadmo and 2-Want were grown under field conditions on different sowing dates during 2 years. Seed coats were manipulated and seed germination was evaluated at different temperatures. Seed coat perforation before incubation led to faster dormancy loss in both accessions. This effect decreased with delayed sowing date, and seeds expressed a level of dormancy not imposed by coats. This suggests the presence of embryo dormancy in the genus Chenopodium . Seeds of the accession 2-Want had a significantly thinner seed coat at later sowing dates, associated with a decreasing coat-imposed dormancy, but this pattern was not detected in Chadmo. The seed coat acts as a barrier to the release of endogenous abscisic acid (ABA) in quinoa, suggested by the increase in germination and a higher amount of ABA leached from perforated seeds. ABA is able to leach from seeds with an intact seed coat, suggesting that differences in seed coat thickness may allow the leakage of different amounts of ABA. This mechanism may contribute to the observed differences in dormancy level, either between sowing dates or between accessions. Fil: Ceccato, Diana Valeria. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos. Banco Base de Germoplasma; Argentina Fil: Bertero, Héctor Daniel. Universidad de Buenos Aires. Facultad de Agronomia. Departamento de Producción Vegetal. Cátedra de Producción Vegetal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario; Argentina Fil: Batlla, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cerealicultura; Argentina Fil: Galati, Beatriz Gloria. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Botánica General; Argentina 2017-09-12T17:38:11Z 2017-09-12T17:38:11Z 2015-05 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/1202 https://www.cambridge.org/core/journals/seed-science-research/article/structural-aspects-of-dormancy-in-quinoa-chenopodium-quinoa-importance-and-possible-action-mechanisms-of-the-seed-coat/5AF8E238EAD187329255B60AFF296A4F 0960-2585 1475-2735 (Online) eng info:eu-repo/semantics/restrictedAccess application/pdf Seed science research 25 (3) : 267-275. (September 2015) |
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Chenopodium Quinoa Dormición Brotes Fecha de Siembra Dormancy Shoots Sowing Date Quinoa Precosecha Latencia Chenopodium Quinoa Dormición Brotes Fecha de Siembra Dormancy Shoots Sowing Date Quinoa Precosecha Latencia |
spellingShingle |
Chenopodium Quinoa Dormición Brotes Fecha de Siembra Dormancy Shoots Sowing Date Quinoa Precosecha Latencia Chenopodium Quinoa Dormición Brotes Fecha de Siembra Dormancy Shoots Sowing Date Quinoa Precosecha Latencia Ceccato, Diana Valeria Bertero, Héctor Daniel Batlla, Diego Galati, Beatriz Gloria Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat |
description |
Two possible sources of resistance to pre-harvest sprouting were evaluated in quinoa. They showed dormancy at harvest and significant variations in dormancy level in response to environmental conditions experienced during seed development. The aims of this work were to evaluate the importance of seed coats in the regulation of dormancy in this species, to investigate possible mechanisms of action and to assess association of seed coat properties with changes in dormancy level caused by the environment. Accessions Chadmo and 2-Want were grown under field conditions on different sowing dates during 2 years. Seed coats were manipulated and seed germination was evaluated at different temperatures. Seed coat perforation before incubation led to faster dormancy loss in both accessions. This effect decreased with delayed sowing date, and seeds expressed a level of dormancy not imposed by coats. This suggests the presence of embryo dormancy in the genus Chenopodium . Seeds of the accession 2-Want had a significantly thinner seed coat at later sowing dates, associated with a decreasing coat-imposed dormancy, but this pattern was not detected in Chadmo. The seed coat acts as a barrier to the release of endogenous abscisic acid (ABA) in quinoa, suggested by the increase in germination and a higher amount of ABA leached from perforated seeds. ABA is able to leach from seeds with an intact seed coat, suggesting that differences in seed coat thickness may allow the leakage of different amounts of ABA. This mechanism may contribute to the observed differences in dormancy level, either between sowing dates or between accessions. |
format |
info:ar-repo/semantics/artículo |
topic_facet |
Chenopodium Quinoa Dormición Brotes Fecha de Siembra Dormancy Shoots Sowing Date Quinoa Precosecha Latencia |
author |
Ceccato, Diana Valeria Bertero, Héctor Daniel Batlla, Diego Galati, Beatriz Gloria |
author_facet |
Ceccato, Diana Valeria Bertero, Héctor Daniel Batlla, Diego Galati, Beatriz Gloria |
author_sort |
Ceccato, Diana Valeria |
title |
Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat |
title_short |
Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat |
title_full |
Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat |
title_fullStr |
Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat |
title_full_unstemmed |
Structural aspects of dormancy in quinoa (Chenopodium quinoa): Importance and possible action mechanisms of the seed coat |
title_sort |
structural aspects of dormancy in quinoa (chenopodium quinoa): importance and possible action mechanisms of the seed coat |
publishDate |
2015-05 |
url |
http://hdl.handle.net/20.500.12123/1202 https://www.cambridge.org/core/journals/seed-science-research/article/structural-aspects-of-dormancy-in-quinoa-chenopodium-quinoa-importance-and-possible-action-mechanisms-of-the-seed-coat/5AF8E238EAD187329255B60AFF296A4F |
work_keys_str_mv |
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1756006983583924224 |