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Plant growth promoting rhizobacteria Dietzia natronolimnaea modulates the expression of stress responsive genes providing protection of wheat from salinity stress
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Plant growth promoting rhizobacteria Dietzia natronolimnaea modulates the expression of stress responsive genes providing protection of wheat from salinity stress
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Journal Article
Plant growth promoting rhizobacteria Dietzia natronolimnaea modulates the expression of stress responsive genes providing protection of wheat from salinity stress
2016
Overview
Plant growth promoting rhizobacteria (PGPR) hold promising future for sustainable agriculture. Here, we demonstrate a carotenoid producing halotolerant PGPR
Dietzia natronolimnaea
STR1 protecting wheat plants from salt stress by modulating the transcriptional machinery responsible for salinity tolerance in plants. The expression studies confirmed the involvement of ABA-signalling cascade, as
TaABARE
and
TaOPR1
were upregulated in PGPR inoculated plants leading to induction of
TaMYB
and
TaWRKY
expression followed by stimulation of expression of a plethora of stress related genes. Enhanced expression of
TaST
, a salt stress-induced gene, associated with promoting salinity tolerance was observed in PGPR inoculated plants in comparison to uninoculated control plants. Expression of SOS pathway related genes (
SOS1
and
SOS4
) was modulated in PGPR-applied wheat shoots and root systems. Tissue-specific responses of ion transporters
TaNHX1
,
TaHAK
, and
TaHKT1
, were observed in PGPR-inoculated plants. The enhanced gene expression of various antioxidant enzymes such as
APX
,
MnSOD
,
CAT
,
POD
,
GPX
and
GR
and higher proline content in PGPR-inoculated wheat plants contributed to increased tolerance to salinity stress. Overall, these results indicate that halotolerant PGPR-mediated salinity tolerance is a complex phenomenon that involves modulation of ABA-signalling, SOS pathway, ion transporters and antioxidant machinery.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 38/39
/ 38/77
/ Abscisic Acid - pharmacology
/ Actinomycetales - classification
/ Actinomycetales - physiology
/ Enzymes
/ Gene Expression Regulation, Developmental
/ Gene Expression Regulation, Plant
/ Humanities and Social Sciences
/ Plant Roots - growth & development
/ Plant Shoots - growth & development
/ Proline
/ Salinity
/ Salt-Tolerant Plants - genetics
/ Salt-Tolerant Plants - growth & development
/ Salt-Tolerant Plants - microbiology
/ Science
/ Shoots
/ Triticum - growth & development
/ Wheat
