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Silicon amendment induces synergistic plant defense mechanism against pink stem borer (Sesamia inferens Walker.) in finger millet (Eleusine coracana Gaertn.)
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Silicon amendment induces synergistic plant defense mechanism against pink stem borer (Sesamia inferens Walker.) in finger millet (Eleusine coracana Gaertn.)
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Journal Article
Silicon amendment induces synergistic plant defense mechanism against pink stem borer (Sesamia inferens Walker.) in finger millet (Eleusine coracana Gaertn.)
2020
Overview
Silicon (Si) uptake and accumulation in plants can mitigate various biotic stresses through enhanced plant resistance against wide range of herbivores. But the role of silicon in defense molecular mechanism still remains to be elucidated in finger millet. In the present study, we identified three silicon transporter genes viz.
EcLsi1
,
EcLsi2
, and
EcLsi6
involved in silicon uptake mechanism. In addition, the study also identified and characterized ten different Si transporters genes from finger millet through transcriptome assembly. The phylogenetic study revealed that
EcLsi1
and
EcLsi6
are homologs while
EcLsi2
and
EcLsi3
form another pair of homologs.
EcLsi1
and
EcLsi6
belong to family of NIP2s (Nod26-like major intrinsic protein),
bona fide
silicon transporters, whereas
EcLsi2
and
EcLsi3
, an efflux Si transporter, belong to an uncharacterized anion transporter family having a significant identity with putative arsB transporter proteins. Further, the phylogenetic and topology analysis suggest that
EcLsi1
and
EcLsi2
co-evolved during evolution while,
EcLsi2
and
EcLsi3
are evolved from either
EcLsi1
and/or
EcLsi6
by fusion or duplication event. Moreover, these silicon transporters are predicted to be localized in plasma membrane, but their structural differences indicate that they might have differences in their silicon uptake ability. Silicon amendment induces the synergistic defense mechanism by significantly increasing the transcript level of silicon transporter genes (
EcLsi1
,
EcLsi2
and
EcLsi6
) as well as defense hormone regulating genes (
EcSAM
,
EcPAL
and
EcLOX
) at 72 hpi (hours of post infestation) in both stem and roots compared to non-silicon treated plants against pink stem borer in finger millet plants. This study will help to understand the molecular defense mechanism for developing strategies for insect pest management.
