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Liquid Culture Systems for in vitro Plant Propagation

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238 T<strong>in</strong>o Hempfl<strong>in</strong>g & Walter Preil<br />

Figure 6: Effect of 0.5 mg l -1 IAA (A) and 1.0 mg l -1 NAA (B) on root<strong>in</strong>g of Phalaenopsis<br />

cv. Jaun<strong>in</strong>a after 8-week culture. 1.0 mg l -1 NAA <strong>in</strong>duced thick roots and <strong>in</strong>hibited shoot<br />

elongation.<br />

The highest percentage of rooted shoots (93.8 %) and highest root<br />

number (3.7 roots per shoot) were achieved <strong>in</strong> 1.0 mg l -1 IAA-conta<strong>in</strong><strong>in</strong>g<br />

medium after exposure to six immersions per day. The <strong>in</strong>crease of fresh<br />

weight was 3.7-fold.<br />

Two immersions per day resulted <strong>in</strong> an overall average of 63.5 % of<br />

rooted shoots. Four and six immersions gave rise to 88.7 % and 87.4 %<br />

rooted shoots, respectively (Figure 7). The fresh weight <strong>in</strong>crease was 2.2fold<br />

when two immersions per day were applied and reached 3.3-fold after<br />

application of four and six immersions per day.<br />

The survival rate of plants rooted <strong>in</strong> TIS under different experimental<br />

conditions was determ<strong>in</strong>ed <strong>in</strong> the greenhouse after 42 days of<br />

acclimatization. On average 94 % of the plants survived. There was no<br />

significant statistical difference between plants from different TIS precultures.

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