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Liquid Culture Systems for in vitro Plant Propagation

Liquid Culture Systems for in vitro Plant Propagation

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<strong>Propagation</strong> of Prunus and Malus by temporary immersion 247<br />

Three samples <strong>for</strong> each treatment from each replication of 5-10 mg of<br />

powdered dried tissue, were dissolved <strong>in</strong> water and after 5 m<strong>in</strong>utes<br />

resorc<strong>in</strong>ol (0.05 % <strong>in</strong> absolute ethanol) was added to the water solution.<br />

After addition of HCl (12 mol), the samples were heated at 77° C <strong>for</strong> 8 m<strong>in</strong><br />

and cooled immediately <strong>in</strong> ice <strong>for</strong> 5-10 m<strong>in</strong>. Fructose content was<br />

determ<strong>in</strong>ed with a spectrophotometer (Hitachi 2000) at � = 420nm. S<strong>in</strong>ce the<br />

test does not dist<strong>in</strong>guish between free fructose and fructose bound <strong>in</strong><br />

sucrose, estimation of the amount bound <strong>in</strong> the sucrose was per<strong>for</strong>med after<br />

<strong>in</strong>itial destruction of the free fructose <strong>in</strong> the sample by hot alkal<strong>in</strong>e (KOH<br />

2N) treatment. After KOH addition the samples were boiled <strong>for</strong> 10 m<strong>in</strong> and<br />

cooled immediately <strong>in</strong> ice <strong>for</strong> 5-10 m<strong>in</strong>. The difference between total<br />

fructose content and the fraction bound <strong>in</strong> sucrose molecules represented the<br />

content of free fructose.<br />

Table 1: Multiplication media<br />

Apple Peach Cherry Plum<br />

Macrosalts MS LP MS LP<br />

Microsalts MS MS MS LP<br />

Vitam<strong>in</strong>s MS* MS MS MS<br />

Calcium pantothenate mgl -1 - - - 1<br />

Biot<strong>in</strong> mg l -1 - - - 0.1<br />

Riboflav<strong>in</strong> mg l -1 - - - 0.5<br />

Sucrose g l -1 30 30 30 30<br />

BA mg l -1 0.5 0.4 0.5 0.25<br />

IBA mg l -1 0.1 0.06 0.1 0.1<br />

GA3 mg l -1 - 0.03 - -<br />

Aden<strong>in</strong>e sulphate. mg l -1 - 3 - -<br />

*Thiam<strong>in</strong>e ten-fold concentrated (1mg l -1 )<br />

MS: Murashige and Skoog, 1962; LP: Quoir<strong>in</strong> et al., 1977.<br />

Table 2: Multiplication rate of plants grown <strong>in</strong> different cultural conditions<br />

(Data are the mean of three values ± s.e.). L = liquid, S = solid, 30’ and 60’= TI period of 30<br />

or 60 m<strong>in</strong>utes<br />

Cultural conditions Plum Cherry Peach Apple<br />

L<br />

S<br />

30’<br />

60’<br />

3 ± 0.32a<br />

30 ± 2.89b<br />

n.r.<br />

28 ± 2.54b<br />

2 ± 0.31a<br />

5 ± 1.05bc<br />

6 ± 1.17b<br />

4 ± 0.77c<br />

3 ± 0.28a<br />

20 ± 2.06b<br />

8 ± 1.57c<br />

14 ± 2.79d<br />

3 ± 0.28a<br />

10 ± 1.97b<br />

2 ± 0.41c<br />

8 ± 1.63b<br />

n.r.: not recorded<br />

Means with<strong>in</strong> a column followed by different letter are significantly different (P � 0.05).

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