Back to Search
Start Over
Foliar application of sodium selenate induces regulation in yield formation, grain quality characters and 2-acetyl-1-pyrroline biosynthesis in fragrant rice.
- Source :
-
BMC plant biology [BMC Plant Biol] 2019 Nov 15; Vol. 19 (1), pp. 502. Date of Electronic Publication: 2019 Nov 15. - Publication Year :
- 2019
-
Abstract
- Background: Selenium (Se) is a beneficial element for higher plants and essential for mammals. To study the effect of the foliar application of sodium selenate on fragrant rice performance, a pot experiment was conducted in Guangdong, China. At the initial heading stage, one-time foliar application of sodium selenate with concentrations of 0, 10, 20, 30, 40 and 50 μmol·L <superscript>- 1</superscript> (named CK, Se1, Se2, Se3, Se4 and Se5, respectively) were foliar applied on two fragrant rice varieties, 'Meixiangzhan-2' and 'Xiangyaxiangzhan'.<br />Results: Selenate application at the initial heading stage not only improved the grain yield of fragrant rice by increasing the seed-setting rate and grain weight, but also promoted the grain quality by increasing crude protein contents and lowering the chalky rice rate. Furthermore, Se applications enhanced the biosynthesis of 2-acetyl-1- pyrroline (2-AP), the main aromatic compound, by increasing the contents of precursors (△1- pyrroline, proline and pyrroline-5-carboxylic acid (P5C)) and the activities of enzymes (proline dehydrogenase (PRODH), △1-pyrroline-5-carboxylic acid synthetase (P5CS), and ornithine aminotransferase (OAT)) in fragrant rice. The results also showed that foliar application of sodium selenate enhanced the antioxidant system of both varieties by promoting the activities of peroxidase (POD), superoxide dismutase (SOD), catalase (CAT) and reducing the contents of malondialdehyde (MDA). Furthermore, the real-time PCR analyses depicted that foliar application of selenate up-regulated the GPX1, GPX4 and CATC transcripts. The higher antioxidative enzymatic activities might strength the stress resistant to ensure the stability of yield in fragrant rice form abiotic stress.<br />Conclusions: Foliar applications of sodium selenate at the initial heading stage increased the grain 2-AP content by enhancing the biosynthesis-related enzymes and precursors. The grain yield and quality of fragrant rice also increased due to selenate application. Furthermore, foliar application of selenate promoted the activities of enzymes such as POD, SOD and CAT and up-regulated the expression of gene GPX4, GPX1 and CATC.
- Subjects :
- Antioxidants metabolism
Biomass
Catalase metabolism
Edible Grain drug effects
Edible Grain enzymology
Edible Grain genetics
Edible Grain growth & development
Malondialdehyde metabolism
Oryza enzymology
Oryza genetics
Oryza growth & development
Peroxidases metabolism
Plant Proteins metabolism
Proline metabolism
Superoxide Dismutase metabolism
Gene Expression Regulation, Plant drug effects
Oryza drug effects
Pyrroles metabolism
Selenic Acid administration & dosage
Subjects
Details
- Language :
- English
- ISSN :
- 1471-2229
- Volume :
- 19
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- BMC plant biology
- Publication Type :
- Academic Journal
- Accession number :
- 31730480
- Full Text :
- https://doi.org/10.1186/s12870-019-2104-4