Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering
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 gr...
| Autores principales: | , , , |
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| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
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Southern Cross Publishing
2020
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| Materias: | |
| Acceso en línea: | https://www.cropj.com/neiff_13_12_2019_2053_2061.pdf http://hdl.handle.net/20.500.12123/7046 https://doi.org/10.21475/ajcs.19.13.12.p2070 |
| _version_ | 1855035786870652928 |
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| author | Neiff, Nicolás Ploschuk, Edmundo L. Valentinuz, Oscar Rodolfo Andrade, Fernando Hector |
| author_browse | Andrade, Fernando Hector Neiff, Nicolás Ploschuk, Edmundo L. Valentinuz, Oscar Rodolfo |
| author_facet | Neiff, Nicolás Ploschuk, Edmundo L. Valentinuz, Oscar Rodolfo Andrade, Fernando Hector |
| author_sort | Neiff, Nicolás |
| collection | INTA Digital |
| 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 | info:ar-repo/semantics/artículo |
| id | INTA7046 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Southern Cross Publishing |
| publisherStr | Southern Cross Publishing |
| record_format | dspace |
| spelling | INTA70462020-04-06T15:06:31Z Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering Neiff, Nicolás Ploschuk, Edmundo L. Valentinuz, Oscar Rodolfo Andrade, Fernando Hector Maíz Estrés Térmico Temperatura Respuesta Fisiológica Floración Crecimiento Maize Heat Stress Temperature Physiological Response Flowering Growth 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. EEA Paraná Fil: Neiff, Nicolás. Consejo Nacional de Investigaciónes Científicas y Técnicas; Argenti Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Departamento de Producción Vegetal; Argentina Fil: Ploschuk, Edmundo L. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cultivos Industriales; Argentina Fil: Valentinuz, Oscar. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina. Fil: Andrade, Fernando H. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina. Consejo Nacional de Invetigacioes Científicas y Técnicas; Argentina. 2020-04-06T15:03:11Z 2020-04-06T15:03:11Z 2019-12 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.cropj.com/neiff_13_12_2019_2053_2061.pdf http://hdl.handle.net/20.500.12123/7046 1835-2693 1835-2707 https://doi.org/10.21475/ajcs.19.13.12.p2070 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Southern Cross Publishing Australian Journal of Crop Science 13 (12) : 2053-2061 (2019) |
| spellingShingle | Maíz Estrés Térmico Temperatura Respuesta Fisiológica Floración Crecimiento Maize Heat Stress Temperature Physiological Response Flowering Growth Neiff, Nicolás Ploschuk, Edmundo L. Valentinuz, Oscar Rodolfo Andrade, Fernando Hector Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering |
| title | 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_short | 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 |
| topic | Maíz Estrés Térmico Temperatura Respuesta Fisiológica Floración Crecimiento Maize Heat Stress Temperature Physiological Response Flowering Growth |
| url | https://www.cropj.com/neiff_13_12_2019_2053_2061.pdf http://hdl.handle.net/20.500.12123/7046 https://doi.org/10.21475/ajcs.19.13.12.p2070 |
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