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Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?

Drought is one of the most important abiotic stress factors limiting maize production worldwide. The objective of this study was to investigate whether photoprotection of PSII was associated with the degree of drought tolerance and yield in three maize hybrids (30Y87, 31R88, P3939). To do this, thre...

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Autores principales: Bashir, Nahidah, Athar, Habib-ur-Rehman, Kalaji, Hazem M., Wróbel, Jacek, Mahmood, Seema, Zafar, Zafar Ullah, Ashraf, Muhammad
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8708075/
https://www.ncbi.nlm.nih.gov/pubmed/34948287
http://dx.doi.org/10.3390/ijms222413490
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author Bashir, Nahidah
Athar, Habib-ur-Rehman
Kalaji, Hazem M.
Wróbel, Jacek
Mahmood, Seema
Zafar, Zafar Ullah
Ashraf, Muhammad
author_facet Bashir, Nahidah
Athar, Habib-ur-Rehman
Kalaji, Hazem M.
Wróbel, Jacek
Mahmood, Seema
Zafar, Zafar Ullah
Ashraf, Muhammad
author_sort Bashir, Nahidah
collection PubMed
description Drought is one of the most important abiotic stress factors limiting maize production worldwide. The objective of this study was to investigate whether photoprotection of PSII was associated with the degree of drought tolerance and yield in three maize hybrids (30Y87, 31R88, P3939). To do this, three maize hybrids were subjected to three cycles of drought, and we measured the activities of photosystem II (PSII) and photosystem I (PSI). In a second field experiment, three maize hybrids were subjected to drought by withholding irrigation, and plant water status, yield and yield attributes were measured. Drought stress decreased leaf water potential (Ψ(L)) in three maize hybrids, and this reduction was more pronounced in hybrid P3939 (−40%) compared to that of 30Y87 (−30%). Yield and yield attributes of three maize hybrids were adversely affected by drought. The number of kernels and 100-kernel weight was the highest in maize hybrid 30Y87 (−56%, −6%), whereas these were lowest in hybrid P3939 (−88%, −23%). Drought stress reduced the quantum yield of PSII [Y(II)], photochemical quenching (qP), electron transport rate through PSII [ETR(II)] and NPQ, except in P3939. Among the components of NPQ, drought increased the Y(NPQ) with concomitant decrease in Y(NO) only in P3939, whereas Y(NO) increased in drought-stressed plants of hybrid 30Y87 and 31R88. However, an increase in cyclic electron flow (CEF) around PSI and Y(NPQ) in P3939 might have protected the photosynthetic machinery but it did not translate in yield. However, drought-stressed plants of 30Y87 might have sufficiently downregulated PSII to match the energy consumption in downstream biochemical processes. Thus, changes in PSII and PSI activity and development of NPQ through CEF are physiological mechanisms to protect the photosynthetic apparatus, but an appropriate balance between these physiological processes is required, without which plant productivity may decline.
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spelling pubmed-87080752021-12-25 Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize? Bashir, Nahidah Athar, Habib-ur-Rehman Kalaji, Hazem M. Wróbel, Jacek Mahmood, Seema Zafar, Zafar Ullah Ashraf, Muhammad Int J Mol Sci Article Drought is one of the most important abiotic stress factors limiting maize production worldwide. The objective of this study was to investigate whether photoprotection of PSII was associated with the degree of drought tolerance and yield in three maize hybrids (30Y87, 31R88, P3939). To do this, three maize hybrids were subjected to three cycles of drought, and we measured the activities of photosystem II (PSII) and photosystem I (PSI). In a second field experiment, three maize hybrids were subjected to drought by withholding irrigation, and plant water status, yield and yield attributes were measured. Drought stress decreased leaf water potential (Ψ(L)) in three maize hybrids, and this reduction was more pronounced in hybrid P3939 (−40%) compared to that of 30Y87 (−30%). Yield and yield attributes of three maize hybrids were adversely affected by drought. The number of kernels and 100-kernel weight was the highest in maize hybrid 30Y87 (−56%, −6%), whereas these were lowest in hybrid P3939 (−88%, −23%). Drought stress reduced the quantum yield of PSII [Y(II)], photochemical quenching (qP), electron transport rate through PSII [ETR(II)] and NPQ, except in P3939. Among the components of NPQ, drought increased the Y(NPQ) with concomitant decrease in Y(NO) only in P3939, whereas Y(NO) increased in drought-stressed plants of hybrid 30Y87 and 31R88. However, an increase in cyclic electron flow (CEF) around PSI and Y(NPQ) in P3939 might have protected the photosynthetic machinery but it did not translate in yield. However, drought-stressed plants of 30Y87 might have sufficiently downregulated PSII to match the energy consumption in downstream biochemical processes. Thus, changes in PSII and PSI activity and development of NPQ through CEF are physiological mechanisms to protect the photosynthetic apparatus, but an appropriate balance between these physiological processes is required, without which plant productivity may decline. MDPI 2021-12-16 /pmc/articles/PMC8708075/ /pubmed/34948287 http://dx.doi.org/10.3390/ijms222413490 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bashir, Nahidah
Athar, Habib-ur-Rehman
Kalaji, Hazem M.
Wróbel, Jacek
Mahmood, Seema
Zafar, Zafar Ullah
Ashraf, Muhammad
Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
title Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
title_full Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
title_fullStr Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
title_full_unstemmed Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
title_short Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
title_sort is photoprotection of psii one of the key mechanisms for drought tolerance in maize?
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8708075/
https://www.ncbi.nlm.nih.gov/pubmed/34948287
http://dx.doi.org/10.3390/ijms222413490
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