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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 219 - 233 (15page)
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The R2R3-type MYB transcription factors have been shown to increase flavonoids accumulation by regulating the expression of key enzyme genes related to flavonoid biosynthesis pathway. However, the roles and underlying mechanisms of the soybean GmMYB12 gene in regulation of flavonoids accumulation and tolerance to abiotic stresses are rarely known. In the present study, the GmMYB12 gene was isolated and its function was characterized. Sequence and yeast one-hybrid analyses showed that GmMYB12 contained two MYB domains and belonged to R2R3-MYB protein with transactivation activity. Subcellular localization analysis in onion epidermal cells indicated that GmMYB12 was localized to the nucleus. Overexpression of GmMYB12 increased the production of downstream flavonoids and the expression of related genes in the flavonoid biosynthesis pathway. It also improved resistance to salt and drought stresses during seed germination, root development, and growing stage. Further component and enzymatic analyses showed significant increases of proline content, pyrroline-5-carboxylate synthase (P5CS), superoxide dismutase (SOD), and peroxidase (POD) activities, as well as significant reduction of H2O2 and malonaldehyde (MDA) content under salt and drought stresses in transgenic plants. Meanwhile, the expression level of AtP5CS, AtSOD and AtPOD genes was up-regulated against salt and drought stresses. Together, our finding indicated that changing the expression level of GmMYB12 in plants alters the accumulation of flavonoids and regulates plantlet tolerance to abiotic stress by regulating osmotic balance, protecting membrane integrity and maintaining ROS homeostasis. The GmMYB12 gene has the potential to be used to increase the content of valuable flavonoids and improve the tolerance to abiotic stresses in plants
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참고문헌 (65)
참고문헌 신청
Albert NW / 2009 / Light-induced vegetative anthocyanin pigmentation in Petunia / J Exp Bot 60:2191~2202
Alia / 2001 / Effect of proline on the production of singlet oxygen / Amino Acids 21:195~200
Balasundram N / 2006 / Phenolic compounds in plants and agri-industrial by-products : antioxidant activity, occurrence, and potential uses / Food Chem 99:191~203
Baudry A / 2004 / TT2, TT8, and TTG1 synergistically specify the expression of BANYULS and proanthocyanidin biosynthesis in Arabidopsis thaliana / Plant J 39:366~380
Ben-Amor M / 1999 / Inhibition of ethylene biosynthesis by antisense ACC oxidase RNA prevents chilling injury in Charentais cantaloupe melons / Plant Cell Environ 22:1579~1586
Alia / 2001 / Effect of proline on the production of singlet oxygen / Amino Acids 21:195~200
Balasundram N / 2006 / Phenolic compounds in plants and agri-industrial by-products : antioxidant activity, occurrence, and potential uses / Food Chem 99:191~203
Baudry A / 2004 / TT2, TT8, and TTG1 synergistically specify the expression of BANYULS and proanthocyanidin biosynthesis in Arabidopsis thaliana / Plant J 39:366~380
Ben-Amor M / 1999 / Inhibition of ethylene biosynthesis by antisense ACC oxidase RNA prevents chilling injury in Charentais cantaloupe melons / Plant Cell Environ 22:1579~1586
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