Abstract
The effects of NH4+ : NO3- in culture medium on growth and nutrient absorption of Phalaenopsis seedlings in vitro were investigated. Leaf number decreased at 8 : 2 and 10: 0 of NH4+ : NO3- (N ratio), and leaf area increased at 0 : 10 and 2 : 8 N ratios. Root number and root length were linearly decreased with increasing NH4+ ratio. Consequently, possibility to control root growth by incubating on the medium with 2 : 8 N ratio without suppression of leaf growth was indicated. Although nitrogen absorption was not affected by N ratios between 0 : 10 and 4 : 6, P, K, Ca, and Mg absorption were remarkably decreased with increasing NH4+ ratio. NH4+ antagonistically inhibited Ca and Mg absorption. Thus, growth and nutrient absorption of Phalaenopsis seedling in vitro were promoted by incubating in culture medium containing NO3- as sole nitrogen source.
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