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Liquid Culture Systems for in vitro Plant Propagation

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382 Pratap Kumar Pati et al.<br />

Table 3: Effect of R. damascena microshoot <strong>in</strong>cubation period <strong>in</strong> root<strong>in</strong>g vessels, on the<br />

percent survival after transfer to greenhouse<br />

Week of transfer Survival (%)<br />

1 3.3±3.3<br />

2 23.3±3.3<br />

3 60.0±5.7<br />

4 66.7±8.8<br />

5 73.3±8.8<br />

6 96.7±3.3<br />

Table 4: Comparative response of R. damascena and R. bourboniana to micropropagation<br />

protocols<br />

Stage of<br />

micropropagation<br />

*<br />

Initiation of<br />

aseptic<br />

culture<br />

**<br />

Shoot<br />

proliferation<br />

***<br />

Root<strong>in</strong>g<br />

****<br />

Harden<strong>in</strong>g<br />

and plantlet<br />

establishment<br />

Parameters R. damascena<br />

Contam<strong>in</strong>ation<br />

rate<br />

Response<br />

R. bourboniana<br />

29.6 � 1.9 18.6 � 3.8<br />

Proliferation<br />

rate<br />

(No. of shoots<br />

per explant)<br />

8.1 ± 0.2 7.5 � 0.2<br />

Root <strong>in</strong>duction<br />

(days)<br />

7-8 7-8<br />

Root<strong>in</strong>g (%) 85.8 � 0.6 94.9 � 2.1<br />

Root length<br />

(mm)<br />

4.6 � 0.4 5.2 � 0.4<br />

Root number<br />

per shoot<br />

9.0 � 0.5 11.4 � 0.4<br />

Survival (%) 96.7 100<br />

Remarks<br />

Surface of nodal explants of<br />

R. bourboniana was smooth<br />

and had fewer / smaller<br />

thorns compared to R.<br />

damascena<br />

R. bourboniana shoots were<br />

sturdy, leaves dark green<br />

with greater surface area<br />

compared to R. damascena<br />

Root<strong>in</strong>g is easier <strong>in</strong> R.<br />

bourboniana.<br />

Basal MS medium produces<br />

root<strong>in</strong>g <strong>in</strong> R. bourboniana<br />

unlike R. damascena<br />

Harden<strong>in</strong>g is easier <strong>in</strong> R.<br />

bourboniana compared to<br />

R. damascena<br />

*Data recorded after 4 weeks of culture <strong>in</strong> MS medium without PGRs<br />

**Data recorded after 6 weeks of culture <strong>in</strong> liquid MS medium + BAP (5 µmol) + sucrose<br />

(3% (w/v))<br />

***Data recorded after 3 weeks of culture; 1 week <strong>in</strong> liquid ½ MS + IBA (10 µmol) +<br />

sucrose (3% (w/v)) and 2 weeks <strong>in</strong> MS + sucrose (3% (w/v))<br />

****Data recorded after 3 weeks of transplantation <strong>in</strong> pott<strong>in</strong>g mix (sand : garden soil, 1: 1)

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