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Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress

The effect of different foliar sprays numbers of cytokinins – (CK) and brassinosteroids – (BR) on the physiological, biochemical, and panicle parameters of rice plants subjected to combined heat stress (high day/night temperatures) were studied in three different experiments. The treatments establis...

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Autores principales: Pantoja-Benavides, Alvaro Daniel, Garces-Varon, Gabriel, Restrepo-Díaz, Hermann
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9815704/
https://www.ncbi.nlm.nih.gov/pubmed/36618669
http://dx.doi.org/10.3389/fpls.2022.983276
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author Pantoja-Benavides, Alvaro Daniel
Garces-Varon, Gabriel
Restrepo-Díaz, Hermann
author_facet Pantoja-Benavides, Alvaro Daniel
Garces-Varon, Gabriel
Restrepo-Díaz, Hermann
author_sort Pantoja-Benavides, Alvaro Daniel
collection PubMed
description The effect of different foliar sprays numbers of cytokinins – (CK) and brassinosteroids – (BR) on the physiological, biochemical, and panicle parameters of rice plants subjected to combined heat stress (high day/night temperatures) were studied in three different experiments. The treatments established for the first (E1) and second (E2) experiments were the following: i) absolute control, ii) stress control, iii) heat stress + one foliar spray of CK, iv) heat stress + two foliar sprays of CK, v) heat stress + three foliar sprays of CK, vi) heat stress + one foliar spray of BR, vii) heat stress + two foliar sprays of BR, or viii) heat stress + three foliar sprays of BR. For the third experiment (E3), the treatments were the following: i) absolute control, ii) stress control, iii) heat stress + three foliar applications of CK, iv) heat stress + three foliar applications of BR. Rice-stressed plants and sprayed with three foliar sprays of CK or BR had a better stomatal conductance in E1 and E2 compared to their heat-stressed control. The relative tolerance index suggests that three CK or BR applications helped to mitigate the combined heat stress in both experiments. The foliar CK or BR applications at the flowering and grain-filling stages in rice-stressed plants increased Fv/Fm ratio and panicle characteristics (number of filled spikelets and the percentage of panicle blanking in E3). In conclusion, foliar applications of BR or CK can be considered an agronomic strategy to help improve the negative effect of combined heat stress conditions on the physiological behavior of rice plants during different phenological stages.
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spelling pubmed-98157042023-01-06 Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress Pantoja-Benavides, Alvaro Daniel Garces-Varon, Gabriel Restrepo-Díaz, Hermann Front Plant Sci Plant Science The effect of different foliar sprays numbers of cytokinins – (CK) and brassinosteroids – (BR) on the physiological, biochemical, and panicle parameters of rice plants subjected to combined heat stress (high day/night temperatures) were studied in three different experiments. The treatments established for the first (E1) and second (E2) experiments were the following: i) absolute control, ii) stress control, iii) heat stress + one foliar spray of CK, iv) heat stress + two foliar sprays of CK, v) heat stress + three foliar sprays of CK, vi) heat stress + one foliar spray of BR, vii) heat stress + two foliar sprays of BR, or viii) heat stress + three foliar sprays of BR. For the third experiment (E3), the treatments were the following: i) absolute control, ii) stress control, iii) heat stress + three foliar applications of CK, iv) heat stress + three foliar applications of BR. Rice-stressed plants and sprayed with three foliar sprays of CK or BR had a better stomatal conductance in E1 and E2 compared to their heat-stressed control. The relative tolerance index suggests that three CK or BR applications helped to mitigate the combined heat stress in both experiments. The foliar CK or BR applications at the flowering and grain-filling stages in rice-stressed plants increased Fv/Fm ratio and panicle characteristics (number of filled spikelets and the percentage of panicle blanking in E3). In conclusion, foliar applications of BR or CK can be considered an agronomic strategy to help improve the negative effect of combined heat stress conditions on the physiological behavior of rice plants during different phenological stages. Frontiers Media S.A. 2022-12-22 /pmc/articles/PMC9815704/ /pubmed/36618669 http://dx.doi.org/10.3389/fpls.2022.983276 Text en Copyright © 2022 Pantoja-Benavides, Garces-Varon and Restrepo-Díaz https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Pantoja-Benavides, Alvaro Daniel
Garces-Varon, Gabriel
Restrepo-Díaz, Hermann
Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
title Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
title_full Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
title_fullStr Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
title_full_unstemmed Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
title_short Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
title_sort foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9815704/
https://www.ncbi.nlm.nih.gov/pubmed/36618669
http://dx.doi.org/10.3389/fpls.2022.983276
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