Corm Weight-Dependent Reproduction of Pinellia ternata.

Tominaga Tohru, Nakagaki Akiko

doi:10.3719/weed.42.18

Pinellia ternata (Thunb.) Breit. is an Araceae perennial weed and reproduces by seeds, bulbils produced on both lamina joints and petioles, and cormlets. The relationship between its reproductive mode and corm weight was investigated.<br>In April, 1992, two hundred fifty corms were sampled in a flower garden, weighed, planted individually in 11cm diameter ×10cm depth pots filled with soil from a vegetable field and dug up in October, 1992. The number of leaves expanded, bulbils and scapes formed were recorded over time. Weight of each bulbil was measured individually.<br>Four different leaf types were produced in order as the plant grew, representing separate growth stages. These were the cordate, auriculate, tripartite and ternately compound leaf stages. Individuals in the cordate leaf stage seldom produced reproductive organs. Only a few individuals in the auriculate leaf stage produced bulbils on petioles, while almost all of the individuals in the tripartite leaf stage did so. All individuals in the ternately compound leaf stage produced bulbils on both lamina joints and petioles. Flowering plants always had ternately compound leaves and corm fresh weight heavier than 0.79g. Number of leaves expanded, bulbils produced, and bulbil weight were highly related to corm weight. Reproduction of this weed was inferred to be closely dependent on corm weight.

Corm Weight-Dependent Reproduction of Pinellia ternata.

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