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Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?
Int J Mol Sci. 2021 Dec 16; 22(24)IJ

Abstract

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 (ΨL) 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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Authors+Show Affiliations

Bashir N
Department of Botany, The Women University, Multan 66000, Pakistan. Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan 60800, Pakistan.
Athar HU
Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan 60800, Pakistan.
Kalaji HM
Department of Plant Physiology, Institute of Biology, University of Life Sciences SGGW, 02-776 Warsaw, Poland. Institute of Technology and Life Sciences, National Research Institute, Falenty, Al. Hrabska 3, 05-090 Raszyn, Poland.
Wróbel J
Department of Bioengineering, West Pomeranian University of Technology in Szczecin, Słowackiego 17, 71-434 Szczecin, Poland.
Mahmood S
Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan 60800, Pakistan.
Zafar ZU
Institute of Pure and Applied Biology, Bahauddin Zakariya University, Multan 60800, Pakistan.
Ashraf M
Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54590, Pakistan.

MeSH

DroughtsElectron TransportElectronsLightPhotosynthesisPhotosystem I Protein ComplexPhotosystem II Protein ComplexPlant LeavesStress, PhysiologicalWaterZea mays

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34948287

Citation

Bashir, Nahidah, et al. "Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize?" International Journal of Molecular Sciences, vol. 22, no. 24, 2021.
Bashir N, Athar HU, Kalaji HM, et al. Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize? Int J Mol Sci. 2021;22(24).
Bashir, N., Athar, H. U., Kalaji, H. M., Wróbel, J., Mahmood, S., Zafar, Z. U., & Ashraf, M. (2021). Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize? International Journal of Molecular Sciences, 22(24). https://doi.org/10.3390/ijms222413490
Bashir N, et al. Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize. Int J Mol Sci. 2021 Dec 16;22(24) PubMed PMID: 34948287.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Is Photoprotection of PSII One of the Key Mechanisms for Drought Tolerance in Maize? AU - Bashir,Nahidah, AU - Athar,Habib-Ur-Rehman, AU - Kalaji,Hazem M, AU - Wróbel,Jacek, AU - Mahmood,Seema, AU - Zafar,Zafar Ullah, AU - Ashraf,Muhammad, Y1 - 2021/12/16/ PY - 2021/10/01/received PY - 2021/11/27/revised PY - 2021/12/03/accepted PY - 2021/12/24/entrez PY - 2021/12/25/pubmed PY - 2022/1/13/medline KW - 100-kernal weight KW - cyclic electron transport KW - donor-end limitations to PSI KW - nonphotochemical quenching KW - yield JF - International journal of molecular sciences JO - Int J Mol Sci VL - 22 IS - 24 N2 - 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 (ΨL) 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. SN - 1422-0067 UR - https://www.unboundmedicine.com/medline/citation/34948287/Is_Photoprotection_of_PSII_One_of_the_Key_Mechanisms_for_Drought_Tolerance_in_Maize DB - PRIME DP - Unbound Medicine ER -