Mechanism of staggered multiple seedling production from Amorphophallus bulbifer and Amorphophallus muelleri and its application to cultivation in Southeast Asia

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  • ZHANG Donghua
    School of Chemistry & Biotechnology, the Yunnan Nationalities University
  • WANG Qingping
    Quality Standard Research Institute,Yunnan Academy of Agriculture Sciences, and Supervision & Testing Center for Farm Products Quality, Ministry of Agriculture
  • GEORGE S. Srzednicki
    Food Science & Technology, School of Chemical Sciences & Engineering, The University of New South Wales

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  • Mechanism of Staggered Multiple Seedling Production from <I>Amorphophallus bulbifer</I> and <I>Amorphophallus muelleri</I> and its Application to Cultivation in Southeast Asia

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In Amorphophallus bulbifer and Amorphophallus muelleri, five seedlings develop sequentially in a year when seeds are sown, and two seedlings develop when bulbils are used as planting materials. This growth mode of release of multiple seedlings contrasts with the traditional growth mode of commonly grown konjak species, i.e. production of one corm by a single seedling. In the present study, the propagation rate and the bulking rate were compared between the relay seedling release mode and one seedling release mode. The propagation coefficients were 1, 10 and 330 when seed corms, bulbils and seeds were used as planting materials, respectively. The bulking rates were 6,000 and 100 when seeds and bulbils were planted, whereas 4-6 when seedlings were raised directly from a corm. Cultivation under greenhouse conditions enhanced the germination and prevented the onset of dormancy. As a result, the cultivation period was prolonged from 6 to 9-10 months. The prolongation of the growth period and the multiple seedling release mode may enable to produce a big corm within a year; two years earlier under greenhouse conditions than under fieldconditions. It is likely that the yield potential of cultivated species of konjak which is presently low could be enhanced if seedlings derived from seeds were grown in a greenhouse.

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