Table 1 The effect of PEG and SiO₂-NPs on carotenoid, Fv, and Fv/Fm contents of the genotypes ‘Maragheh’ and ‘Kashan’

PEG (g L^− 1)

SiO₂-NPs (mg L^− 1)

Carotenoid (mg g^− 1 FW)

Carotenoid (mg g^− 1 FW)

Fv

Fv

Fv/Fm

Fv/Fm

0

0

1.627de

1.373j

3.913ab

3.095jk

0.7823a-c

0.7480 g-k

50

1.723b

1.550 fg

3.977a

3.286gh

0.7913ab

0.762d-g

100

1.880a

1.730b

4.004a

3.723 cd

0.7980a

0.7927ab

25

0

1.450i

1.247 l

3.543e

2.816 l

0.7657d-f

0.733j-n

50

1.595ef

1.351jk

3.841bc

2.981 k

0.7713c-e

0.749 g-j

100

1.712bc

1.469hi

3.920ab

3.104jk

0.7767b-d

0.7607d-g

50

0

1.348jk

1.108n

3.5ef

2.625 m

0.7507f-i

0.7323 k-n

50

1.513gh

1.249 l

3.683d

2.744 lm

0.7653d-f

0.7227 l-o

100

1.662 cd

1.363jk

3.841bc

2.756 l

0.7703c-e

0.7380i-l

75

0

1.182 m

1.008o

3.277gh

2.283op

0.7347i-m

0.7053pq

50

1.336jk

1.093n

3.478ef

2.495n

0.7477 g-k

0.7183n-p

100

1.503gh

1.182 m

3.673d

2.695 lm

0.7563e-h

0.7327 k-n

100

0

1.078n

0.8637p

3.143ij

2.169p

0.7217 m-o

0.6957q

50

1.192 m

0.9943o

3.24hi

2.306o

0.733j-n

0.702q

100

1.316 k

1.108n

3.381 fg

2.472n

0.7427 h-k

0.7090o-q

 Drought (a)

**

**

**

**

**

**

 Treatment (b)

**

**

**

**

**

**

 ab

ns

ns

ns

ns

**

**

 Genotype (c)

**

**

**

**

**

**

 ac

*

*

**

**

ns

ns

 bc

ns

ns

ns

ns

**

**

 abc

**

**

**

**

**

**