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Table 3 Agronomic traits engineered via chloroplast genome

From: Recent achievements obtained by chloroplast transformation

Site of integration

Regulatory sequences

Transgene/s

Efficiency of expression

Enhanced traits

References

rbcL/accD

Prrn/rbcL 3′

panD

>4-fold β-alanine

Tolerance to high-temperature stress

[39]

trnI/trnA

Prrn/ggagg/psbA

tps1

>169-fold transcript

Drought tolerance: growth in 6% polyethylene glycol and rehydration after 24 days of drought

[40]

rbcL/rbcL

psbA/psbA/3′rbL

Hppd

5% TSP

Resistance to herbicide

[41]

trnI/trnA

Prrn/T7 10/rps16

Badh

93–101 μM g−1 FW

Salt tolerance: carrot plants survived up to 400 mM NaCl

[42]

trnfM/trnG

atpI/rps16

Lycopene β-cyclase

0.28 mg g−1 DW

Herbicide resistance and triggers conversion of lycopene

[43]

rbcL/accD

Prrn/ggagg/psbA

EPSPS/aroA

NR

Resistance to glyphosate (>5 mM)

[32]

prs14/trnG

Prrn/T7 g10/TrbcL

HTP, TCY, TMT

NR

Cold-stress tolerance and increase in vitamin E in fruit

[44]

trnV/rps7/12

Prrn/Trps16

EPSPS

>10% TSP

Resistance to the herbicide glyphosate

[45]

trnV/rps12/7

Prrn/TrbcL

b-bar1

>7% TSP

Resistance to the herbicide phosphinothricin

[46]

trnI/trnA

Prrn/psbA/psbA

phaA

14.71 β-ketothiolase mg−1 FW

Engineered cytoplasmic male sterility

[47]

trnI/trnA

Prrn/T7 g 10/TpsbA

γ-TMT

>7.7% TSP

Increased salt tolerance and enhanced accumulationof É‘-tocopherol in seeds

[48]

trnI/trnA

T7g10 or psbA

RbcS

>150-fold RbcS transcript

Restoration of RuBisCO activity in rbcS mutants

[49]

rbcL/accD

Prrn/ggagg/psbA

cry2Aa2

2–3% of TSP

Resistance to Heliothis virescens, Helicoverpa zea, and Spodoptera exigua

[50]

trnV/3′rps12

prrn T7G10/rps12

Trx f, Trx m

NR

Starch synthesis

[51]

trnI/trnA

5′psbA/3′psbA

ubiC

25% DW

250-fold higher pHBA polymer accumulation than nuclear transgenic lines

[52]

rbcL/accD

PpsbA/Trsp16

TC, γ -TMT

3 nmol h−1 mg−1 FW

Vitamin E accumulation in tobacco and lettuce

[53]

trnV/orf708

psbA/psbA/psbA

BicA

~0.1% TSP

CO2 capture within leaf chloroplasts

[54]

trnV/rps12/7

Prrn/rbcL/rps16

cry1A(c)

3–5% of TSP

Resistance to larvae of Heliothis virescens, Helicoverpa zea, and Spodoptera exigua

[55]

rbcL/accD

Prrn/Trps16

CrtZ, CrtW

NR

Accumulation of astaxanthin fatty acid esters in lettuce

[56]

trnV/rps12/7

Prrn/T7gene10/rbcL

cry1Ab

NR

Resistance to caterpillar of Anticarsia gemmatalis

[57]

trnI/trnA

Prrn/Trps16

MSI-99

89.75 μg g−1 FW

Resistance against rice blast fungus

[30]

trnI/trnA

Prrn/TpsbA

sporamin1, CeCPI2, and chitinase2

0.85–1% TSP

Resistance against Spodoptera litura and Spodoptera exigua leaf spot, as well as soft rot diseases

[58]

trnI/trnA

Prrn/ggagg/psbA

Bt cry2Aa2 operon

45.3% TSP

100% mortality of cotton bollworm, beet armyworm; cuboidal Bt crystals formation

[59]

trnI/trnA

Prrn/ggagg/psbA

msi-99

21–43% TSP

Resistance to in planta challenge of Aspergillus flavus, Fusarium moniliforme, Verticillium dahlia, and Colletotrichum destructivum

[60]

trnI/trnA

Prrn/ggagg/rbcL

Bt cry9Aa2

~10% of TSP

Resistance to Phthorimaea operculella

[61]

trnI/trnA

Prrn/psbA/psbA

Cpo

NR

Resistance to fungal pathogens in vitro (Fusarium verticillioides, and Verticillium dahliae) and in planta (Alternaria alternata)

[62]

trnI/trnA

5′psbA/3′psbA

PelB1, PelD2

~2.42 units mg−1 FW

Resistance against Erwinia soft rot

[63]

trnI/trnA

5′psbA/3′

RC1011, PG12

17–38% TSP

Resistance to Erwinia soft rot and tobacco mosaic virus

[64]

trnI/trnA

5′psbA/3′psbA

Pta

7.1–9.2% TSP

Broad-spectrum resistance against viral/bacterial/phloem-feeding insects

[51]

trnI/trnA

5′psbA/3′psbA

Bgl-1

>160-fold enzyme

Resistance against whitefly and aphid

[65]