JAMES AND H . B E E V E R S Oxford Medicinal Plants Scheme, Department of Botany, University of Oxford (Received 13 March 1950) (With 16 figures in the text) It has long been known that the spadix of Arum has an unusually fast rate of respiration while the inflorescence is developing. Church (1908) speculated that the resulting rise of temperature within the opening spathe, amounting almost to 20Â° C. in ^ . italicutn, might have biological significance in attracting pollinating insects to the flowers; but the metabolic mechanism of the respiration has not previously been studied. Van Herk (1937) has made a notable investigation of the corresponding tissue in the tropical aroid Sauromatum, and his results will be discussed after describing our own. MATERIAL The sterile region of the Arum spadix has been examined in varying stages of development, as shown in Fig. ia-^. The material was mostly growing wild, and was collected from typical sites around Oxford. It was therefore not possible to assess accurately the average time interval between the stages selected, and the intervals may not have been equal between each pair of stages. Nevertheless, by assuming them to be equal, one may
New Phytologist – Wiley
Published: Nov 1, 1950
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