General connections between latex and nectar secretional systems of Asclepias syriaca l.

Tóth-Soma, László (1995) General connections between latex and nectar secretional systems of Asclepias syriaca l. ACTA BIOLOGICA SZEGEDIENSIS, 41. pp. 37-44. ISSN 1588-385X

Preview

Text General connection_Asclepias_biologica_041_037-044.pdf - Published Version Download (1MB) | Preview

Abstract

The intracellular latex secretion and the extracellular nectar secretion are anatomically connected to each other in Asclepias syriaca L. The whole gynostemium is interwoven by the non-articulated laticifers, and they can also be found in the tissues of the epimorph nectary. The latex system is divided into several branches in the gland parenchyma, and the epithelial glandular tissues of the nectary. The question as to whether there is also a functional connection as a consequence of the anatomical connection (or whether it is possible that certain materials of the latex are sccrcted into the nectar and arc finally mixed into the honey) between the two secretional systems was answered by TLC and GC-MSD analyses of the latex and the honey. By means of TLC analyses at 254 nm and reactions with general alkaloid reagents (Dragendorff reagent, Meyer reagent and 1% Cc(S04). solution in I M H,S04), several compounds were detected both in the latex and in the honey of Asclepias. Due to the lack of TLC standards, these compounds were not identified, and only the degree of compositional identity of the latex and the honey was established. By means of GC-MSD (a gas chromatograph coupled with a mass selective detector) analyses, the following compounds which can also be found in the latex were identified in the honey of Asclepias syriaca: 2propcnoic acid 6-methylheptyl ester (retention lime: 6.95 min). pentadecane (ret. time: 10.80 min), diethyl phthalate (ret. time: 11.43 min), hexadecane (ret. time: 12.05 min), heptadecane (ret. time: 13.20 min), 2.6,10,14-tetramethyl pentadecane (ret. time: 13.30 min), octadccane (ret. time: 14.32 min). 2-tetradecanoic acid methyl ethyl ester (ret. time: 14.45 min), phthalic acid butyl 2-mcthylpropyl ester (ret. time: 15.56 min), I -eicosene (ret. time: 17.15 min), docosane (ret. time 18.30 min) and his (2-cthylhexyl) phthalate (ret. time: 20.94 min) The functional connection between the two secretional systems consequent from their anatomical connection is strongly suggested by the partial compositional identity of the latex and the honey, and the direct connection of the latex-system with the glandular tissue of the nectary.

Actions (login required)

Edit Item