Abstract
In this study, pollen micromorphological structure, leaf and stem anatomy structure of six species of Onopordum (O. acanthium L., O. armenum Grossh., O. carduchorum Bornm. & Beauv., O. carmanicum (Bornm.) Bornm., O. heteracanthum C. A. Mey and O. leptolepis DC) were examined with different repetitions. About 17 qualitative anatomical features were statistically analyzed. Glandular trichome, cortex fiber tissue, embowed in subsidiary vascular, its fiber tissue and vascular sheath extensions, adaxial collenchyma tissue and types of adaxial and abaxial stomata were distinct characters in separating of the species. In palynologic studies based on P/E ratio, 2 types of pollen grains were observed: oblate- spheroidal and suboblate. SEM study of the exine showed echinate, reticulate and perforate sculpturing in all six species.
Highlights
The genus Onopordum L. belongs to Cardueae tribe of Asteraceae family, native to Europe, northern Africa, the Canary Islands, the Caucasus, and southwest and central Asia (Keleonikos, 2006)
The present study considers anatomy and micromorphological study of pollen in six Onopordum species occurring in Iran with the aim of providing some basic anatomical and palynological data and to obtain the relationships between taxonomy in the one hand and anatomy and palynolog in the other hand
This study have performed on 40 populations of six Onopordum species, namely O. acanthium L., O. armenum Grossh., O. carduchorum Bornm. & Beauv., O. carmanicum (Bornm.) Bornm., O. heteracanthum C
Summary
The genus Onopordum L. belongs to Cardueae tribe of Asteraceae family, native to Europe (mainly the Mediterranean region), northern Africa, the Canary Islands, the Caucasus, and southwest and central Asia (Keleonikos, 2006). The shape of crosse section of the leaves in all species except O. armenum were U shape while in this taxon lower surface in subsidiary vascular bundles was flat (Fig. 3- I). Leptolepis, O. heteracanthum and O. acanthium were in the upper and lower bundles or completely surrounded the vascular bundles (Fig. 3, 4).
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