期刊
JOURNAL OF PLANT GROWTH REGULATION
卷 41, 期 7, 页码 2869-2885出版社
SPRINGER
DOI: 10.1007/s00344-021-10481-5
关键词
Brassinosteroids; Chlorophylls; Growth; Peroxidase; Root metaxylem
资金
- Fundacao Amazonia de Amparo a Estudos e Pesquisas (FAPESPA/Brazil)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq/Brazil)
- Universidade Federal Rural da Amazonia (UFRA/Brazil)
- Programa de Educacao Tutorial (PET/Brazil) [RSP2020/180, RSP-2021/180]
This study showed that pretreatment with 24-epibrassinolide (EBR) can improve the growth status of salt-stressed tomato plants, including increasing root structure protection and vascularization, alleviating oxidative damage, enhancing photosynthetic pigment content, and promoting biomass accumulation.
Salt stress reduces plant growth by negatively interfering with the division rate and cellular expansion, limiting the growth and development of the roots, stems, and leaves. 24-Epibrassinolide (EBR) is a molecule extracted from plant tissues and is a plant growth regulator with a high capacity to modulate tolerance to abiotic stresses. The objective of this study was to verify the possible improvements promoted by pretreatment with EBR in salt-stressed tomato plants, evaluating the variables related to root anatomy, photosynthetic pigments, antioxidant system, and biomass accumulation. The experiment comprised four treatments: two salt conditions (0 and 150 mM NaCl, described as Na+ (-) and Na+ ( +), respectively) and two concentrations of 24-epibrassinolide (0 and 100 nM EBR, described as EBR (-) and EBR ( +), respectively). EBR modulated the protection and vascularization of root structures, as demonstrated by the increases in epidermis thickness (12%) and metaxilem diameter (119%), respectively. This steroid relieved oxidative damage, which was clearly linked to elevated activities of superoxide ascorbate peroxidase (24%) and guaiacol peroxidase (31%). EBR also benefited photosynthetic pigments, reducing the degradation of chlorophylls. In addition, pretreatment with EBR favoured a higher biomass, which was due to positive effects on leaf and root tissues, including better performance of photosynthetic machinery.
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