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Liquid Culture Systems for in vitro Plant Propagation

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Adaptions of the m<strong>in</strong>eral composition of culture media 501<br />

Table 4: Ratio between concentrations of m<strong>in</strong>erals <strong>in</strong> tissue culture media and closed system<br />

hydroponics <strong>for</strong> Gerbera; * bold: Cu and Mn values after ‘adaptation’ to hydroponic<br />

concentrations<br />

N<br />

total<br />

M<strong>in</strong>eral<br />

NH4 +<br />

- 5.0<br />

NO3<br />

‘Ideally’<br />

adapted med.<br />

not<br />

known<br />

4.8<br />

GAM MS DKW<br />

8.0<br />

4.4<br />

7.5<br />

26.7<br />

5.5<br />

K 4.6 2.6 4.4 4.0<br />

Ca 4.8 5.0 1.7 5.8<br />

Mg 6.0 6.3 3.8 7.5<br />

S(O4 -2 ) n.a. 3.6 2.1 17.1<br />

P(O4 -3 ) 3.2 2.8 1.8 2.8<br />

Fe n.a. 4.0 4.0 4.8<br />

Mn 4.6 20 > 2 * 20 40<br />

Zn 5.0 10 10 24<br />

B 3.1 5.0 5.0 3.9<br />

Cu 5.0 0.2 > 3.2 * 0.2 2.0<br />

Mo 0.15 2.0 2.0 3.2<br />

n.a. = not available<br />

6.3<br />

22.6<br />

4.6<br />

Table 5: <strong>Propagation</strong> results <strong>for</strong> Gerbera after 4 weeks of growth, <strong>for</strong> a representative<br />

propagation cycle on six media<br />

Medium<br />

Weight of<br />

cluster <strong>in</strong> mg<br />

Number of<br />

plantlets<br />

Average size of<br />

plantlets (a.u.)<br />

Colour of<br />

plantlets, habit<br />

MS 166 + 11 3.8 + 0.2 1.01 + 0.01 Green, normal<br />

DKW 277 + 19 4.9 + 0.2 1.38 + 0.04 Green, normal<br />

GAM 411 + 24 6.4 + 0.3 1.33 + 0.04<br />

Green, more<br />

adult leaflets*<br />

GAM–Mn 453 + 22 6.1 + 0.3 1.55 + 0.04 Often chlorotic<br />

GAM+ Cu 590 + 27 6.3 + 0.3 1.56 + 0.05 Dark green<br />

Sometimes<br />

GAM–Mn +Cu 631 + 25 5.8 + 0.3 1.74 + 0.06<br />

chlorotic<br />

*<br />

all’GAM’ plantlets had a more adult habit than plantlets from MS and DKW<br />

a.u. = arbitrary units

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