Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions
Cotton is often exposed to high temperatures during the reproductive stage, which can negatively affect its productivity. The objectives were to: i) test whether heat stress impacts during the reproductive stage on photosynthesis are due to instant temperature effects or to acclimation produced duri...
| Autores principales: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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Wiley
2021
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/10139 https://onlinelibrary.wiley.com/doi/abs/10.1111/jac.12536 https://doi.org/10.1111/jac.12536 |
| _version_ | 1855484533100511232 |
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| author | Mercado Álvarez, Kelly Bertero, Héctor Daniel Paytas, Marcelo Javier Ploschuk, Edmundo L. |
| author_browse | Bertero, Héctor Daniel Mercado Álvarez, Kelly Paytas, Marcelo Javier Ploschuk, Edmundo L. |
| author_facet | Mercado Álvarez, Kelly Bertero, Héctor Daniel Paytas, Marcelo Javier Ploschuk, Edmundo L. |
| author_sort | Mercado Álvarez, Kelly |
| collection | INTA Digital |
| description | Cotton is often exposed to high temperatures during the reproductive stage, which can negatively affect its productivity. The objectives were to: i) test whether heat stress impacts during the reproductive stage on photosynthesis are due to instant temperature effects or to acclimation produced during the heat stress period, ii) evaluate the role of stomatal and mesophyll conductance on net photosynthetic rate and iii) identify possible interactions between heat stress and different source/sink ratios during the reproductive period. Two field experiments were carried out in 2016 (Exp. 1) and 2017 (Exp. 2). Two heating treatment periods were imposed as follows: pre-flowering between 15 days before flower bud and flowering (H1) and post-flowering between flowering and 15 days later (H2). Each treatment had a control group (C1 and C2, respectively). In Exp. 1, two genotypes with contrasting crop cycles were compared. In Exp. 2, 50% defoliated plants (D-) were compared with intact plants (D+) under the same temperature treatments using one genotype. Average daily maximum temperature of heated treatments for both experiments was 37.9 ± 0.79ºC, 5.8ºC higher than the controls. Independently of the period, thermal stress had a negative impact on photosynthesis in both genotypes through an acclimation response, reducing it up to 35% compared with controls when heath-stressed and control plants were measured at the same temperature. Instant responses to temperature were not observed. This decrease was mainly determined by mesophyll conductance, and no recovery was observed 15 days after the end of treatments. Photosynthesis depletion was conditioned by the source/sink ratio, showing a complete recovery only in defoliated plants. It is concluded that thermal stress had a negative acclimation impact on photosynthesis, without responses to changes in instant temperature, and this acclimation is modulated mainly by mesophyll conductance. |
| format | Artículo |
| id | INTA10139 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | INTA101392021-08-30T12:25:14Z Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions Mercado Álvarez, Kelly Bertero, Héctor Daniel Paytas, Marcelo Javier Ploschuk, Edmundo L. Algodón Estrés Térmico Mesofilo Fotosíntesis Conductancia Estomática Cotton Heat Stress Mesophyll Photosynthesis Stomatal Conductance Cotton is often exposed to high temperatures during the reproductive stage, which can negatively affect its productivity. The objectives were to: i) test whether heat stress impacts during the reproductive stage on photosynthesis are due to instant temperature effects or to acclimation produced during the heat stress period, ii) evaluate the role of stomatal and mesophyll conductance on net photosynthetic rate and iii) identify possible interactions between heat stress and different source/sink ratios during the reproductive period. Two field experiments were carried out in 2016 (Exp. 1) and 2017 (Exp. 2). Two heating treatment periods were imposed as follows: pre-flowering between 15 days before flower bud and flowering (H1) and post-flowering between flowering and 15 days later (H2). Each treatment had a control group (C1 and C2, respectively). In Exp. 1, two genotypes with contrasting crop cycles were compared. In Exp. 2, 50% defoliated plants (D-) were compared with intact plants (D+) under the same temperature treatments using one genotype. Average daily maximum temperature of heated treatments for both experiments was 37.9 ± 0.79ºC, 5.8ºC higher than the controls. Independently of the period, thermal stress had a negative impact on photosynthesis in both genotypes through an acclimation response, reducing it up to 35% compared with controls when heath-stressed and control plants were measured at the same temperature. Instant responses to temperature were not observed. This decrease was mainly determined by mesophyll conductance, and no recovery was observed 15 days after the end of treatments. Photosynthesis depletion was conditioned by the source/sink ratio, showing a complete recovery only in defoliated plants. It is concluded that thermal stress had a negative acclimation impact on photosynthesis, without responses to changes in instant temperature, and this acclimation is modulated mainly by mesophyll conductance. EEA Reconquista Fil: Mercado Álvarez, Kelly. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cultivos Industriales; Argentina Fil: Bertero, Héctor Daniel. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Vegetal. Cátedra de Producción Vegetal; Argentina. Fil: Paytas, Marcelo Javier. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Reconquista; Argentina Fil: Ploschuk, Edmundo. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cultivos Industriales; Argentina 2021-08-30T12:14:27Z 2021-08-30T12:14:27Z 2021-08 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/10139 https://onlinelibrary.wiley.com/doi/abs/10.1111/jac.12536 1439-037X https://doi.org/10.1111/jac.12536 eng info:eu-repo/semantics/restrictedAccess application/pdf Wiley Journal of Agronomy and Crop Science (First published: 04 August 2021) |
| spellingShingle | Algodón Estrés Térmico Mesofilo Fotosíntesis Conductancia Estomática Cotton Heat Stress Mesophyll Photosynthesis Stomatal Conductance Mercado Álvarez, Kelly Bertero, Héctor Daniel Paytas, Marcelo Javier Ploschuk, Edmundo L. Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| title | Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| title_full | Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| title_fullStr | Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| title_full_unstemmed | Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| title_short | Mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| title_sort | mesophyll conductance modulates photosynthetic rate in cotton crops exposed to heat stress under field conditions |
| topic | Algodón Estrés Térmico Mesofilo Fotosíntesis Conductancia Estomática Cotton Heat Stress Mesophyll Photosynthesis Stomatal Conductance |
| url | http://hdl.handle.net/20.500.12123/10139 https://onlinelibrary.wiley.com/doi/abs/10.1111/jac.12536 https://doi.org/10.1111/jac.12536 |
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