Abstract
The study of the structure of the pollen presenter of <i>Taraxacum officinale</i> and morphology of pollen grains was conducted based on plant material sampled from three different sites. One of them was a forest meadow situated away from the city, and the other two were located in the city centre of Lublin. Light and electron scanning microscopy were used in the study. The pollen presenter in <i>Taraxacum officinale</i> occurs at the upper part of the style situated over the androecium and on the outer part of the stigma. Numerous unicellular trichomes are found on the entire surface of the epidermis of the presenter. The function of the presenter consists in transferring pollen grains above the androecium and corolla petals. Its activity does not stop after pollen release from anthers. <i>Taraxacum</i> pollen grains represent the <i>Crepis</i> - type. Most frequently, they are <i>tricolporate</i>, radially symmetric and isopolar. In terms of the size, they are included in medium-sized grains. In the material examined, many deformed and asymmetric grains were observed, though they were marked by high viability at the level of 96.5-99%. Grains with the largest average lengths of the equatorial and polar axes were found in plants sampled from the meadow situated out of town. In the plant material from all sites, grains with disturbances of the external structure occurred.
Highlights
Celem pracy by3o okreœlenie struktury prezentera py3kowego po3o¿onego na powierzchni s3upka oraz porównanie morfologii ziaren py3ku pochodz1cych z roœlin mniszka pospolitego wystêpuj1cych w warunkach miejskich na stanowiskach przyulicznych oraz na oddalonej od miasta leœnej 31ce
W tym czasie aktywnoϾ prezentera nie ustaje
Summary
H. Wigg.) jest roœlin[1] jadaln[1], lecznicz[1], truj1c1 i pszczelarsk[1]. Jako roœlina po¿ytkowa dla owadów, mniszek jest wa¿nym Ÿród3em nektaru i py3ku w maju i czerwcu (MaurizioiLouveaux , 1965; Demianowicz , 1979; Lipiñski , 1982, Warakomska , 1962, 2002). Kwiaty Taraxacum officinale charakteryzuj[1] siê wysok[1] wydajnoœci[1] miodow[1] (20 50 kg·ha-1) i py3kow[1] (300 371 kg×ha-1) (Warakomska , 1972; Demianowicz , 1979; Prabucki , 1998). Wed3ug Warakomskiej (2002) procentowy udzia[3] py3ku Taraxacum w miodach okreœlonych przez pszczelarzy jako mniszkowe wynosi3 1 11%, zaœ w miodach z sadów owocowych 1 29%. Taraxacum officinale uznawany jest za gatunek zbiorowy, wielopostaciowy.
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