Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering

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Heat stress affects physiological traits and biomass production in major crops, including maize. We researched the responses of maximum efficiency of photosystem II (Fv/Fm), relative cell injury (RCI), stomatal conductance (gs ), internal CO2 concentration (Ci ), leaf photosynthesis (CER), and...

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Autores principales: Neiff, Nicolás, Ploschuk, Edmundo Leonardo, Valentinuz, Oscar Rodolfo, Andrade, Fernando Héctor
Formato: Artículo
Lenguaje:Inglés
Publicado: Southern Cross Publishing 2024
Materias:
Biomass production
Climate change
Heat stress
Photosynthesis
Zea mays
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/55323
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-55323
record_format dspace
spelling I48-R184-123456789-553232024-10-07T10:34:45Z Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering Neiff, Nicolás Ploschuk, Edmundo Leonardo Valentinuz, Oscar Rodolfo Andrade, Fernando Héctor Biomass production Climate change Heat stress Photosynthesis Zea mays Heat stress affects physiological traits and biomass production in major crops, including maize. We researched the responses of maximum efficiency of photosystem II (Fv/Fm), relative cell injury (RCI), stomatal conductance (gs ), internal CO2 concentration (Ci ), leaf photosynthesis (CER), and crop growth rate (CGR) in two maize cultivars exposed to high temperatures around silking (R1) under field conditions. Temperature regimes (i.e. control and heat) were performed during the pre-silking (–15d R1 to R1) and post-silking (R1+2d to R1+17d) periods. In the heat treatments, polyethylene shelters were used in order to increase daytime temperatures around midday (from 10 A.M. to 2 P.M.) during each period (i.e., pre- and post-silking). In the control treatments, the shelters remained open during the entire growing season. Gas exchange variables, Fv/Fm and relative cell injury (RCI) were measured on ear leaves. CGR was estimated based on biomass samples. CER and Fv/Fm presented maximum reductions at the end of the daytime heating. However, 30 min after the shelters were reopened, Fv/Fm of heated leaves reached values similar to controls, which were closely linked to CER recoveries. RCI was negatively associated with Fv/Fm, and cell injury increased gradually as heating continued. Ci was unaffected by heat treatment, indicating that gs was not the primary cause of CER reduction. Heat stress decreased CGR, and the reduction was positively associated with CER and Fv/Fm in both heating periods. We attempted to scale from cell to crop level and identify some physiological traits that could be helpful in breeding programs for heat stress tolerance. 2024-09-16T11:33:45Z 2024-09-16T11:33:45Z 2019 Artículo Neiff, Nicolás, et al., 2019. Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering. Australian Journal of Crop Science. Lismore: Southern Cross Publishing, vol. 13, no. 12, p. 2053-2061. E-ISSN: 1835-2707. DOI: https://doi.org/10.21475/ajcs.19.13.12.p2070. 1835-2693 http://repositorio.unne.edu.ar/handle/123456789/55323 eng https://doi.org/10.21475/ajcs.19.13.12.p2070 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 2053-2061 application/pdf Southern Cross Publishing Australian Journal of Crop Science, 2019, vol. 13, no. 12, p. 2053-2061.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Biomass production
Climate change
Heat stress
Photosynthesis
Zea mays
spellingShingle Biomass production
Climate change
Heat stress
Photosynthesis
Zea mays
Neiff, Nicolás
Ploschuk, Edmundo Leonardo
Valentinuz, Oscar Rodolfo
Andrade, Fernando Héctor
Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
topic_facet Biomass production
Climate change
Heat stress
Photosynthesis
Zea mays
description Heat stress affects physiological traits and biomass production in major crops, including maize. We researched the responses of maximum efficiency of photosystem II (Fv/Fm), relative cell injury (RCI), stomatal conductance (gs ), internal CO2 concentration (Ci ), leaf photosynthesis (CER), and crop growth rate (CGR) in two maize cultivars exposed to high temperatures around silking (R1) under field conditions. Temperature regimes (i.e. control and heat) were performed during the pre-silking (–15d R1 to R1) and post-silking (R1+2d to R1+17d) periods. In the heat treatments, polyethylene shelters were used in order to increase daytime temperatures around midday (from 10 A.M. to 2 P.M.) during each period (i.e., pre- and post-silking). In the control treatments, the shelters remained open during the entire growing season. Gas exchange variables, Fv/Fm and relative cell injury (RCI) were measured on ear leaves. CGR was estimated based on biomass samples. CER and Fv/Fm presented maximum reductions at the end of the daytime heating. However, 30 min after the shelters were reopened, Fv/Fm of heated leaves reached values similar to controls, which were closely linked to CER recoveries. RCI was negatively associated with Fv/Fm, and cell injury increased gradually as heating continued. Ci was unaffected by heat treatment, indicating that gs was not the primary cause of CER reduction. Heat stress decreased CGR, and the reduction was positively associated with CER and Fv/Fm in both heating periods. We attempted to scale from cell to crop level and identify some physiological traits that could be helpful in breeding programs for heat stress tolerance.
format Artículo
author Neiff, Nicolás
Ploschuk, Edmundo Leonardo
Valentinuz, Oscar Rodolfo
Andrade, Fernando Héctor
author_facet Neiff, Nicolás
Ploschuk, Edmundo Leonardo
Valentinuz, Oscar Rodolfo
Andrade, Fernando Héctor
author_sort Neiff, Nicolás
title Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
title_short Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
title_full Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
title_fullStr Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
title_full_unstemmed Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
title_sort physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
publisher Southern Cross Publishing
publishDate 2024
url http://repositorio.unne.edu.ar/handle/123456789/55323
work_keys_str_mv AT neiffnicolas physiologicalresponsesandpoststressrecoveryinfieldgrownmaizeexposedtohightemperaturesatflowering
AT ploschukedmundoleonardo physiologicalresponsesandpoststressrecoveryinfieldgrownmaizeexposedtohightemperaturesatflowering
AT valentinuzoscarrodolfo physiologicalresponsesandpoststressrecoveryinfieldgrownmaizeexposedtohightemperaturesatflowering
AT andradefernandohector physiologicalresponsesandpoststressrecoveryinfieldgrownmaizeexposedtohightemperaturesatflowering
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