IAWA Journal, Val. 16 (2),1995 ADDENDUM TO ABSTRACTS (published in IAWA J. 16 (1), pp. 24-31) Oetober 6 & 7, 1994, Mar deI Plata, Argentina GRACIELZA DOS SANTOS* & REGIS B. MILLER**, *Raneho Santa Ana BG~J.nie Garden, 1500 North College Avenue, Claremont, California 91711-3101, USA; ** USDA, FS, Forest Produets Laboratory, One Gifford Pinehot Drive, Madison, Wiseonsin 537052398, USA. - Wood anatomical oddities in Bignoniaceae. Study of the wood strueture of Bignoniaeeae has led to some interesting diseoveries: multiperforate plates (MPs) in members of different tribes, net-like struetures in vessel elements of Millingtonia hortensis, siliea bodies in Mansoa kerere, oxalate erystals in vessel elements of Tanaecium noeturnum and lapaehol in Maefadyena unguiseati. 1) MPs were known to be present in some members of the family. We surveyed 57 genera and 172 species (sampie size 335) and found 14 genera and 54 species (sampie size 94) to have MPs of either the Tabebuia type or the Oroxylum type. No MPs were observed in lianas. 2) An unusual net-like structure overlays the MPs in Millingtonia hortensis (sampie size 5). Examination of this structure using light and scanning electron microseopy showed that it also oecurs on the lateral walls of the vessel elements. Interestingly, these thickenings were observed only on vessel elements with MPs. To our knowledge, Millingtonia hortensis is the only plant known to have this structure. 3) Siliea bodies were found in ray cells of Mansoa kerere (sampIe size 15), whieh is the only known oceurrenee in the family. 4) Calcium oxalate erystals are commonly found in the ray cells of members of Bignoniaceae. However, we found oxalate erystals in the vessel elements of Tanaeeium noeturnum (sampie size 6). A solid block of crystals completely fills the lumen of some vessel elements. 5) Lapaehol, a yellow powder (naphthoquinone) with cancer-fighting properties, is found in the heartwood vessels and bark of several tree species of Bignoniaceae. It is common in some species of Tabebuia and is occasionally present, to a smaller degree, in the heartwood of related tree genera in Tecomeae. However, we found lapaehol in Maefadyena unguis-eati (sampie size 5), a liana in the tribe Bignonieae. It is not presently clear to us what the funetional and phylogenetic significance of these five interesting features iso Much additional study is needed.
IAWA Journal – Brill
Published: Jan 1, 1995
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