Abstract
Phalaenopsis, an important pot plants worldwide, are propagated with a tissue culture technique. The aim of the present study was to validate growth models for Phalaenopsis plantlets with measured data. Effect of temperature and light irradiance on the growth characteristics was investigated by total weight, total leaf area and weight ratio of shoot to root weight for Phalaenopsis Sogo Yukidian ‘V3’. Relationship between culture days and total weight and leaf area of plantlets with was analyzed by nonlinear regression analysis. A four-parameter logistics model for growth rate was selected used as the growth index for further study. The relationships between environmental factors and the total weight, total leaf area of plantlets and the weight ratio of leaf to root were evaluated by multiple regression analysis. These environmental factors all had a significant effect on the growth characteristics. The optimal microclimate conditions for plantlets culture of Phalaenopsis Sogo Yukidian ‘V3’ determined from the regression results were light irradiance 40–60μmolm−2s−1, light temperature 29–32°C and dark temperature 22–25°C. The results can be useful information for propagating Phalaenopsis plantlets.
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