Life (Basel, Switzerland), 2022-06, Vol.12 (6), p.833
2022
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- Autor(en) / Beteiligte
- Titel
- Unearthing the Alleviatory Mechanisms of Brassinolide in Cold Stress in Rice
- Ist Teil von
- Life (Basel, Switzerland), 2022-06, Vol.12 (6), p.833
- Ort / Verlag
- Basel: MDPI AG
- Erscheinungsjahr
- 2022
- Quelle
- Free E-Journal (出版社公開部分のみ）
- Beschreibungen/Notizen
- Cold stress inhibits rice germination and seedling growth. Brassinolide (BR) plays key roles in plant growth, development, and stress responses. In this study, we explored the underlying mechanisms whereby BR helps alleviate cold stress in rice seedlings. BR application to the growth medium significantly increased seed germination and seedling growth of the early rice cultivar “Zhongzao 39” after three days of cold treatment. Specifically, BR significantly increased soluble protein and soluble sugar contents after three days of cold treatment. Moreover, BR stimulated the activity of superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase; thereby alleviating cold-induced damage and increasing glutathione content and the GSH/GSSG ratio while concomitantly reducing H2O2 content. BR upregulated the expression levels of cold-response-related genes, including OsICE1, OsFer1, OsCOLD1, OsLti6a, OsSODB, OsMyb, and OsTERF2, and downregulated that of OsWRKY45, overall alleviating cold stress symptoms. Thus, BR not only upregulated cellular osmotic content and the antioxidant enzyme system to maintain the physiological balance of reactive oxygen species under cold but, additionally, it regulated the expression of cold-response-related genes to alleviate cold stress symptoms. These results provide a theoretical basis for rice breeding for cold resistance using young seedlings.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 2075-1729eISSN: 2075-1729DOI: 10.3390/life12060833Titel-ID: cdi_doaj_primary_oai_doaj_org_article_63f9ea3d40f34576be085a92a9cc5a62
- Format
- –
- Schlagworte
- antioxidant enzymes, Antioxidants, Aquatic plants, Ascorbic acid, Brassinolide, Catalase, Chlorophyll, Cold, Cold resistance, cold stress, Cold treatment, Cultivars, Enzymes, Free radicals, Gene expression, gene regulation, Genes, Germination, Glutathione, Hydrogen peroxide, L-Ascorbate peroxidase, Low temperature resistance, Nitrogen, osmotic substance, Peroxidase, Plant breeding, Plant growth, Plant resistance, Proteins, Reactive oxygen species, Rice, Seed germination, Seedlings, Seeds, Stress response, Sugar, Sulfur, Superoxide dismutase