Overexpression of Del Gene from Snapdragon Improves Anthocyanin Accumulation and Abiotic Stress Tolerance in Tobacco
The co-expression of Rosea1 (Ros1) and Delila (Del) genes control the
anthocyanin accumulation in snapdragon flowers. In tomato, their
overexpression strongly induces anthocyanin accumulation. Korean researchers
led by Aung Htay Naing from Kyungpook National University investigated how
Del expression alone influences anthocyanin accumulation.
In tobacco, Del expression enhanced leaf and flower anthocyanin production
through the regulation of NtCHS, NtCHI, NtF3H, NtDFR, and NtANS transcript
levels. Transgenic overexpression lines displayed different anthocyanin
colors, resulting from varying levels of biosynthetic gene transcripts.
Under salt stress, the T2 generation had higher total polyphenol content,
radical scavenging activities, antioxidant-related gene expression, as well
as overall greater salt and drought tolerance than wildtypes.
These results suggest that Del overexpression elevates transcript levels of
anthocyanin biosynthetic and antioxidant-related genes, leading to enhanced
anthocyanin production and antioxidant activity, leading to improved abiotic
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