Title:

Stress-inducible expression of barley Hva1 gene in transgenic mulberry displays enhanced tolerance against drought, salinity and cold stress

Journal name:

Transgenic Research

Authors:

Vibha G. Checker, Anju K. Chhibbar and Paramjit Khurana

Corresponding Authors:

Paramjit Khurana Department of Plant Molecular Biology, University of Delhi South Campus, Dhaula Kuan, New Delhi-110021, India.

Supplementary data 2 Table 1 and Fig. S1 to S7

 

Line

 

Abbreviation

 

Average Leaf 

Area (cm2)

 

Internodal   

Length (cm)

Control (NT) NT 44.3 ± 07.51 3.2 ± 0.2

actin1:Hva1 ST 37.0 ± 05.19 2.3 ± 0.6

rd29A:Hva1 VR1 53.3 ± 04.00 2.7 ± 1.2

rd29A:Hva1 VR6.2 56.1 ± 01.80 2.6 ± 0.5

rd29A:Hva1 VR7.1 51.6 ± 10.00 2.7 ± 0.3

rd29A:Hva1 VR8.1 52.3 ± 04.72 2.6 ± 0.4

rd29A:Hva1 VR9.1 60.3 ± 16.20 2.4 ± 0.0

rd29A:Hva1 VR11.3 96.4 ± 05.80 2.4 ± 0.2

Supplementary data 2 Table 1: Morphological features of transgenic and non-transgenic lines

a

b

c

DROUGHT STRESS SALT STRESS

a

b

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

K2 ST02 ST17 ST25 ST33 ST46

Yie

ld F

v/Fm

0h 6h 24h 48h

c

Supplementary data 2, Fig. S1 Physiological characterization of actin1:Hva1 transgenic lines under drought (2% PEG) and salinity stress (400 mM NaCl). Proline content (a), Membrane injury (b), and Photosynthetic yield (Fv/Fm) (c) were measured at indicated time points. (K2 = Non-transgenic line, ST = actin1:Hva1 transgenic lines) Values are significant at P ≤ 0.05

(b) (c)

(d)

(g)

(f)(e)

(h)

NT ST VR9.1

(a)

Right border

(25bp)

Bam

HI

Sac

I

pBI121:rd29a:Hva1

Nos-pro(302 bp)

NPT II (795bp)

Nos-ter(253 bp)

rd29A-Pro (686bp)

Hva 1(642bp)

Nos-ter(253 bp)

Left Border (26 bp)

Hin

dIII

I

(g)

Supplementary data 2, Fig. S2 Transformation and regeneration of mulberry (Morus indica) cv. K-2 via Agrobacterium tumefaciens (pBI121:rd29A:Hva1). (a) Vector map of pBI121:rd29a:Hva1. (b) Non-transformed hypocotyl, cotyledon and calli respectively. (c) Transformed explants after transfer to selection medium. (d) Regenerating explants on shoot elongation medium. (e) Shoot explants on root inducing medium. (f) Regenerants established in earthen pots. (g) Morphology of some transgenic plants. (h) Appearance of non-transgenic (NT), ST (actin1:Hva1) and VR9.1 (rd29A:Hva1) plants

Ladd

er

Hva 1

Pos

itive

1000 bp

500 bp

250 bp

a

Transgenic plants

Neg

ativ

e

VR

1

VR

2

VR

4.2

VR

5.5

VR

6.2

VR

7.1

VR

8.1

VR

9.1

VR

11.3

VR

12.1

VR

11.3

Ladd

er

Transgenic plants

npt II1000 bp

500 bp

b

VR

1

VR

4

VR

5.5

VR

6.2

VR

7.1

VR

8.1

VR

9.1

Pos

itive

Neg

ativ

e

Supplementary data 2, Fig. S3 PCR analysis of genomic DNA samples of putative transgenic plants of M. indica cv. K2 using specific primers of Hva1 (a) and nptII (b)

Supplementary data 2, Fig. S4 Molecular confirmation of rd29A:Hva1 overexpressing transgenic mulberry plants (VR) and non-transgenic control plants (NT). Southern hybridization of genomic DNA samples of transgenic plants of mulberry was carried out with Hva1 gene as probe. Lane 1 and 2: NT (Non-transgenic/negative control), lane 3 to 8: BamHI and SacI digested samples of genomic DNA of transformed plantlets

a b

c d

Supplementary data 2, Fig. S5 Comparison of non-transgenic (NT), actin1:Hva1 (ST) and rd29A:Hva1 (VR) transgenic mulberry plants under control conditions. Proline content (a), percent membrane injury (b), photosynthetic yield (Fv/Fm) (c), and relative water content (RWC) (d) were measured to evaluate metabolic status of plants. Leaf tissues harvested on 0 day of the experiment were used for various analyses. Results are average of three experiments and three independent plants were taken for each experiment. Error bars represent standard deviation. Values are significant at P ≤ 0.05

STNT VR1 VR6.2 VR7.1 VR8.1 VR9.1 VR11.3

NT VR1 VR9.1 VR11.3ST

Supplementary data 2, Fig. S6 Western blot analysis to confirm expression of barley HVA1 in transgenic mulberry plants leaf proteins under field conditions

Supplementary data 2, Fig. S7 In situ detection of reactive oxygen species (ROS) by nitroblue tetrazolium (NBT) staining of non-transgenic (NT), actin1:Hva1 (ST) and rd29A:Hva1 (VR) transgenic mulberry leaves. Blue color indicates the characteristic staining pattern of ROS