Gülay ECEVİT GENÇ, Şükran KÜLTÜR, İlker GENÇ

CAPSULE, LEAF AND CYATHIAL GLAND MORPHOLOGY OF TURKISH PERENNIAL TAXA OF Euphorbia L. SECTION Pithyusa (Raf.) Lázaro

Bu çalışma Euphorbia L. subg. Esula Pers. sect. Pithyusa (Raf.) Lázaro çok yıllık türlerinin siatyum gland şekilleri, kapsula ve gövde yaprak yüzey mikromorfolojilerine dayanmaktadır. Siatyum gland yapılarının incelenmesi doğrudan arazi çalışmaları sırasında canlı örnekler üzerinden yapılmıştır. Gövde yaprağı ve kapsulanın yüzey özellikleri taramalı elektron mikroskobu (SEM) ile incelenmiştir. Ayrıca kapsula boyutu, kapsula şekli, kapsula ve gövde yaprak yüzey özellikleri de incelenmiştir. Çalışılan türlerin kapsula şekilleri hemen hemen küresel’den koniğe değişir. Araştırılan türlerden çoğunun gland rengi parlak sarı-yeşil veya yeşilimsi sarıdır. Bazı türlerde ise glandlar kırmızı veya mor renkli olabilir. Tüm türlerde gland sayıları E. pestalozzae Boiss. haricinde dörttür. Bu türün bazı bireylerinin 5 glandlı olduğu saptanmıştır. Üç farklı gland şekli (eliptik, trapezoid-eliptik veya böbreksi) gözlenmiştir. kapsula yüzeyleri, incelenen türlerin yarısından fazlasında (7 takson) meme başı benzeri çıkıntılarla (papillat-mammillat) kaplı iken, diğer türlerde küçük yuvarlak veya tepecik benzeri yükseltilerle (kollikulat) kaplıdır. İncelenen türlerin çoğunluğunda gövde yaprak yüzeyleri papillat-mammillattır. Kollikulat yüzeyler de iki türde görülmüştür (E. seguieriana Necker ve E. thessala (Form.) Degen & Dörf.) Sonuç olarak, Euphorbia sect. Pithyusa türlerine ait gland ve kapsula morfolojik özelliklerinin türlerin ayrımında ayırt edici karakterler olarak kullanılabileceği gösterilmiştir.

CAPSULE, LEAF AND CYATHIAL GLAND MORPHOLOGY OF TURKISH PERENNIAL TAXA OF Euphorbia L. SECTION Pithyusa (Raf.) Lázaro

Macro and micromorphology of cyathial glands, capsules and cauline leaf surfaces of 13 perennial species ofEuphorbia L. subg. Esula Pers. sect. Pithyusa (Raf.) Lázaro in Turkey were studied. Cyathial gland structure, based on cyathialgland shapes, colour and appendages was examined from live material by direct field observations and investigations. Caulineleaves and capsule surface features were analysed with scanning electron microscopy (SEM). Capsule sizes, capsule shapesand capsule and cauline leaf surface ornamentations were also studied. The capsule shape was found to vary from subgloboseto conical. In most species, cyathial gland colour ranged from greenish-yellow to yellowish-green but some species weredistinguished by their reddish or purplish cyathial glands. Although the number of cyathial glands in all species was four, fivecyathial glands were determined to exist in some specimens of E. pestalozzae Boiss. Three different cyathial gland shapes(elliptic, trapezoid-elliptic or elliptic-reniform) were observed. Capsule surface of more than half of the studied species (7 taxa)is covered with nipple-like projections (papillate-mammillate) and the rest are covered with tiny rounded or hillock-likeornamentation (colliculate). The cauline leaf surface is papillate-mammillate in the majority of the studied species, although,colliculate surface is also observed in two species (E. seguieriana Necker and E. thessala (Form.) Degen & Dörf.). In conlusion,macro and micromorphological structures of cyathial gland and capsule of Euphorbia sect. Pithyusa taxa appeared to be usefuldiagnostic characters for species identifications.

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