Table 22.2
Heavy metal(loid)-resistant PGPR including rhizobia discovered in the last two decades and their applications
PGPR
Associated crop
Media
a
PGP traits
b
MIC
c
/MBC/
MTC/MRL/
Highest
tolerance
Plant growth
promotion
study
performed on
(plant)
Mode of
study
Improvements in
crops after PGPR
inoculation
Reference
Enterobacter
bugandensis
TJ6
Lactuca sativa
(Lettuce)
Urease screening
agar plates
Urease, IAA,
siderophore
(MIC-mg
L
À1
)
Cd-400
Pb-1700
L. sativa
Hydroponic
experiment
in a
glasshouse
• Compared with
controls, inoculation with both
strains significantly improved
the root and shoot
dry weight
• Soluble protein
and vitamin C
content enhanced
by both strains
• Reduced Cd and
Pb content in edible tissue.
• Strain HD8
found more proficient in reduction
of Cd and Pb
uptake in lettuce
than TJ6
Wang
et al.
(2020)
Bacillus
megaterium
HD8
Cd-700
Pb-2100
Serratia
marcescens
SNB6
Chrysopogon
zizanioides
(Vetiver
grass)
NM
Phosphate,
IAA,
siderophore
(MIC- ND)
Cd
C. zizanioides
Pot experiment
conducted in
green house
• Improved the
genes expression
of (low molecular
weight organic
acids) LMWOAs,
PGP traits, biomass
• Improved the
activities of antioxidant enzymes
Wu et al.
(2020)
(continued)
22 Beneficial Role of Plant Growth-Promoting Rhizobacteria in Bioremediation of. . .
455
Heavy metal(loid)-resistant PGPR including rhizobia discovered in the last two decades and their applications
PGPR
Associated crop
Media
a
PGP traits
b
MIC
c
/MBC/
MTC/MRL/
Highest
tolerance
Plant growth
promotion
study
performed on
(plant)
Mode of
study
Improvements in
crops after PGPR
inoculation
Reference
Enterobacter
bugandensis
TJ6
Lactuca sativa
(Lettuce)
Urease screening
agar plates
Urease, IAA,
siderophore
(MIC-mg
L
À1
)
Cd-400
Pb-1700
L. sativa
Hydroponic
experiment
in a
glasshouse
• Compared with
controls, inoculation with both
strains significantly improved
the root and shoot
dry weight
• Soluble protein
and vitamin C
content enhanced
by both strains
• Reduced Cd and
Pb content in edible tissue.
• Strain HD8
found more proficient in reduction
of Cd and Pb
uptake in lettuce
than TJ6
Wang
et al.
(2020)
Bacillus
megaterium
HD8
Cd-700
Pb-2100
Serratia
marcescens
SNB6
Chrysopogon
zizanioides
(Vetiver
grass)
NM
Phosphate,
IAA,
siderophore
(MIC- ND)
Cd
C. zizanioides
Pot experiment
conducted in
green house
• Improved the
genes expression
of (low molecular
weight organic
acids) LMWOAs,
PGP traits, biomass
• Improved the
activities of antioxidant enzymes
Wu et al.
(2020)
(continued)
22 Beneficial Role of Plant Growth-Promoting Rhizobacteria in Bioremediation of. . .
455