Effects of brassinosteroids on photosynthetic performance and nitrogen metabolism in pepper seedlings under chilling stress

Yang, P., Wang, Y., Li, J. and Bian, Z. ORCID: 0000-0002-8312-840X, 2019. Effects of brassinosteroids on photosynthetic performance and nitrogen metabolism in pepper seedlings under chilling stress. Agronomy, 9 (12): 839. ISSN 2073-4395

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Abstract

To investigate the effects of brassinosteroids on plant growth and nitrogen metabolism in pepper seedlings under chilling stress, pepper seedlings with three true leaves were foliar pretreated with 0.1 μM exogenous 24-epibrassinolide (EBR) before carrying out chilling stress for 7 days. The results showed that perapplication of EBR mitigated the chill-induced decrease in plant growth via maintenance of a high net photosynthetic rate (Anet), maximum quantum efficiency (Fv/Fm), and photochemical quenching coefficient (qP). Exogenous EBR markedly increased the levels of partial free amino acids (proline, arginine, aspartic acid, and glycine) and promoted nitrogen metabolism through increasing the activities of nitrate reductase (NR), glutamine synthase (GS), glutamate synthase (GOGAT), and glutamate dehydrogenase (GDH) in the leaves of pepper seedlings under chilling stress. The effect of exogenous EBR on the content of reactive oxygen species was also investigated. Pretreatment with EBR reduced the accumulation of hydrogen peroxide (H2O2) and superoxide anion (O2−·), and concomitantly alleviated membrane lipid peroxidation of pepper leaves under chilling stress. These results suggest that foliar pretreatment of EBR has a positive effect on improving the chilling tolerance of pepper seedlings via maintaining a high photosynthetic capability and enhancing the nitrogen metabolism.

Item Type: Journal article
Publication Title: Agronomy
Creators: Yang, P., Wang, Y., Li, J. and Bian, Z.
Publisher: MDPI AG
Date: 3 December 2019
Volume: 9
Number: 12
ISSN: 2073-4395
Identifiers:
NumberType
10.3390/agronomy9120839DOI
1255875Other
Rights: © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 28 Jan 2020 11:21
Last Modified: 28 Jan 2020 11:21
URI: http://irep.ntu.ac.uk/id/eprint/39099

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