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Effect of triticale waxes on host selection by aphids

100%

Wojcicka A., Leszczynski B.

Herba Polonica

2004

tom 50

nr 3-4

Epicuticular components from the surface of flag leaves and ears of the triticale cultivars were identified by combined gas chromatography/mass spectrometry. After separating dichloromethane extracts of flag leaves and ears, the major chemicals of the LAD 898 cultivar were 14,16- hentriacontanedione (39.01 V40.21%) and lauric acid 2-(hexadecyloxy)-3-(octadecyloxy) propyl ester (15.22%-23.02%), while waxes of flag leaves and ears of MSx366 contained a high percentage of octacosane and triacontane. The results presented here suggest that 14,16-hentriacontanedione and lauric acid 2-(hexadecyloxy)-3-(octadecyloxy) propyl ester might be responsible for resistance of waxy triticale to the grain aphid.

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Epibionts on upper Eifelian crinoid columnals from the Holy Cross Mountains, Poland

84%

Gluchowski E.

Acta Palaeontologica Polonica

2005

tom 50

nr 2

Most of 378 upper Eifelian crinoid columnals collected from the lower part of Skały Beds in the Holy Cross Mountains display traces of borings produced by endobionts, but only approximately 20% of them show traces of epibionts. These infested crinoids are represented by 5 stem−based species: Tantalocrinus scutellus, Schyschcatocrinus creber, Gilbertsocrinus vetulus, Pentagonostipes petaloides, and Cycloocetocrinussp. They were fouled by 19 species of suspension−feeding epibionts, including saccamminid foraminiferans, rugose and tabulate corals, cyrtinitid and productid brachiopods, “ctenostome bryozoans”, “cyclostome bryozoans”, cystoporate bryozoans, and rhabdomesid? bryozoans, crinoids, and organisms of uncertain affinities. The majority of these epibionts were opportunistic commensals colonizing living crinoids, and only some utilized dead crinoids as hard substrate for attachment. At least some of these epibionts seem to have settled selectively on particular crinoid host species.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Herba Polonica

1 Gluchowski E.

1 Leszczynski B.

1 Wojcicka A.

1 2005

1 2004

Wyniki wyszukiwania

Effect of triticale waxes on host selection by aphids

Epibionts on upper Eifelian crinoid columnals from the Holy Cross Mountains, Poland