Maize senescence under contrasting source-sink ratios during the grain filling period

Grain growth and leaf senescence are the main processes during post-silking in maize. An unanswered question is how changes in sink strength (the number of grains to be filled) affect leaf senescence. We studied the effect of changes in the source-sink ratio during grain filling on the dynamics of g...

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Detalles Bibliográficos
Autores: Abeledo, L. G., Savin, Roxana, Slafer, Gustavo A.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/69534
Acceso en línea:https://doi.org/10.1016/j.envexpbot.2020.104263
http://hdl.handle.net/10459.1/69534
Access Level:acceso abierto
Palabra clave:Grain weight
Grain yield
Leaf greenness
Photosynthesis
Stem reserves
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spelling Maize senescence under contrasting source-sink ratios during the grain filling periodAbeledo, L. G.Savin, RoxanaSlafer, Gustavo A.Grain weightGrain yieldLeaf greennessPhotosynthesisStem reservesGrain growth and leaf senescence are the main processes during post-silking in maize. An unanswered question is how changes in sink strength (the number of grains to be filled) affect leaf senescence. We studied the effect of changes in the source-sink ratio during grain filling on the dynamics of green leaf area and photosynthetic rate. Maize plants were exposed to ear removal, pollination prevention, degraining or defoliation treatments during post-silking in two sowing dates. Green leaf area, leaf photosynthetic rate and leaf greenness were periodically measured. At maturity, yield, grain weight, and stem dry weight were determined. Green leaf area loss showed a first phase of slow senescence followed by a second phase of rapid senescence in all conditions. The response of green leaf area duration (GLAD) to the source-sink treatments depended on environmental conditions: ear removal increased GLAD while defoliations reduced it in the early sowing date, though GLAD was unaffected by these treatments in the late sowing date. But any change in senescence was less than proportional to the changes in the source-sink ratio. Leaf photosynthetic rate or leaf greenness (SPAD) did not change with the source-sink treatments. Defoliation caused a remarkable remobilisation of reserves from the stem, which did not fully mitigate the reduction in grain weight. It is concluded that (i) manipulations of source-sink balances modified slightly leaf longevity but not the functionality of the remaining leaf area (leaf photosynthetic rate), the response of GLAD being dependant on environmental conditions, and (ii) grain weight was more susceptible than GLAD to reductions in source-sink ratio.LGA held a ‘Juan de la Cierva’ post-doctoral contract funded by the Spanish Ministry of Science during the experimental phase of this research. Funding was provided by Project 8031 of the Regional Fund for Agricultural Technology (FONTAGRO).Elsevier2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://doi.org/10.1016/j.envexpbot.2020.104263http://hdl.handle.net/10459.1/69534reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.envexpbot.2020.104263Environmental and Experimental Botany, 2020, vol. 180, p. 104263cc-by-nc-nd (c) Elsevier, 2020info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/3.0/esoai:repositori.udl.cat:10459.1/695342026-06-24T12:42:17Z
dc.title.none.fl_str_mv Maize senescence under contrasting source-sink ratios during the grain filling period
title Maize senescence under contrasting source-sink ratios during the grain filling period
spellingShingle Maize senescence under contrasting source-sink ratios during the grain filling period
Abeledo, L. G.
Grain weight
Grain yield
Leaf greenness
Photosynthesis
Stem reserves
title_short Maize senescence under contrasting source-sink ratios during the grain filling period
title_full Maize senescence under contrasting source-sink ratios during the grain filling period
title_fullStr Maize senescence under contrasting source-sink ratios during the grain filling period
title_full_unstemmed Maize senescence under contrasting source-sink ratios during the grain filling period
title_sort Maize senescence under contrasting source-sink ratios during the grain filling period
dc.creator.none.fl_str_mv Abeledo, L. G.
Savin, Roxana
Slafer, Gustavo A.
author Abeledo, L. G.
author_facet Abeledo, L. G.
Savin, Roxana
Slafer, Gustavo A.
author_role author
author2 Savin, Roxana
Slafer, Gustavo A.
author2_role author
author
dc.subject.none.fl_str_mv Grain weight
Grain yield
Leaf greenness
Photosynthesis
Stem reserves
topic Grain weight
Grain yield
Leaf greenness
Photosynthesis
Stem reserves
description Grain growth and leaf senescence are the main processes during post-silking in maize. An unanswered question is how changes in sink strength (the number of grains to be filled) affect leaf senescence. We studied the effect of changes in the source-sink ratio during grain filling on the dynamics of green leaf area and photosynthetic rate. Maize plants were exposed to ear removal, pollination prevention, degraining or defoliation treatments during post-silking in two sowing dates. Green leaf area, leaf photosynthetic rate and leaf greenness were periodically measured. At maturity, yield, grain weight, and stem dry weight were determined. Green leaf area loss showed a first phase of slow senescence followed by a second phase of rapid senescence in all conditions. The response of green leaf area duration (GLAD) to the source-sink treatments depended on environmental conditions: ear removal increased GLAD while defoliations reduced it in the early sowing date, though GLAD was unaffected by these treatments in the late sowing date. But any change in senescence was less than proportional to the changes in the source-sink ratio. Leaf photosynthetic rate or leaf greenness (SPAD) did not change with the source-sink treatments. Defoliation caused a remarkable remobilisation of reserves from the stem, which did not fully mitigate the reduction in grain weight. It is concluded that (i) manipulations of source-sink balances modified slightly leaf longevity but not the functionality of the remaining leaf area (leaf photosynthetic rate), the response of GLAD being dependant on environmental conditions, and (ii) grain weight was more susceptible than GLAD to reductions in source-sink ratio.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.envexpbot.2020.104263
http://hdl.handle.net/10459.1/69534
url https://doi.org/10.1016/j.envexpbot.2020.104263
http://hdl.handle.net/10459.1/69534
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.envexpbot.2020.104263
Environmental and Experimental Botany, 2020, vol. 180, p. 104263
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier, 2020
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/3.0/es
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier, 2020
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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