Overexpression of flowering locus D (FLD) in Indian mustard (Brassica juncea) enhances tolerance to Alternaria brassicae and Sclerotinia sclerotiorum
Key message Overexpression of BjFLD in Brassica juncea imparts resistance against fungal pathogens and increases the yield. These transgenics could lower the use of fungicides, which have detrimental effects on the environment. Productivity of Indian mustard ( Brassica juncea) is adversely affected...
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Published in | Plant cell reports Vol. 42; no. 7; pp. 1233 - 1250 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.07.2023
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Key message
Overexpression of BjFLD in Brassica juncea imparts resistance against fungal pathogens and increases the yield. These transgenics could lower the use of fungicides, which have detrimental effects on the environment.
Productivity of Indian mustard (
Brassica juncea)
is adversely affected by fungal phytopathogens,
Alternaria brassicae
and
Sclerotinia sclerotiorum. Arabidopsis
flowering locus D (FLD) positively regulates jasmonic acid signaling and defense against necrotrophic pathogens. In this study, the endogenous FLD (
B. juncea
FLD;
BjFLD)
in Indian mustard was overexpressed in
B. juncea
to determine its role in biotic stress tolerance. We report the isolation, characterization, and functional validation of
BjFLD.
The transgene expression was confirmed by qRT-PCR. The constitutive overexpression of
BjFLD
enhanced the tolerance of
B. juncea
to
A. brassicae
and
S. sclerotiorum
, which was manifested as delayed appearance of symptom, impeded disease progression, and enhanced percentage of disease protection. The transgenic lines maintained a higher photosynthetic capacity and redox potential under biotic stress and could detoxify reactive oxygen species (ROS) by modulating the antioxidant machinery and physiochemical attributes. The
BjFLD
-overexpressing lines showed enhanced SA level as well higher NPR1 expression. The overexpression of BjFLD induced early flowering and higher seed yield in the transgenic lines. These findings indicate that overexpression of
BjFLD
enhances the tolerance of
B. juncea
to
A. brassicae
and
S. sclerotiorum
by induction of systemic acquired resistance and mitigating the damage caused by stress-induced ROS. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0721-7714 1432-203X |
DOI: | 10.1007/s00299-023-03021-w |