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Acta Botanica Croatica, Vol. 70 No. 1, 2011.

Original scientific paper

https://doi.org/10.2478/v10184-010-0017-2

Morphogenesis, volume and number of hop (Humulus lupulus L.) glandular trichomes, and their influence on alpha-acid accumulation in fresh bracts of hop cones

Siniša Srečec ; Križevci College of Agriculture, M. Demerca 1, HR-48260 Križevci, Croatia
Vesna Zechner Krpan ; Faculty of Food Technology and Biotechnology, University of Zagreb, Department of Biochemical Engineering, Pierrotijeva 6, HR-10000 Zagreb, Croatia
Sanja Marag ; Faculty of Food Technology and Biotechnology, University of Zagreb, Department of Biochemical Engineering, Pierrotijeva 6, HR-10000 Zagreb, Croatia
Igor Špoljarić ; Forensic Science Centre »Ivan Vu~eti}«, Ilica 335, HR-10000 Zagreb, Croatia
Ivka Kvaternjak ; Faculty of Food Technology and Biotechnology, University of Zagreb, Department of Biochemical Engineering, Pierrotijeva 6, HR-10000 Zagreb, Croatia
Gordan Mršić ; Forensic Science Centre »Ivan Vu~eti}«, Ilica 335, HR-10000 Zagreb, Croatia

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Abstract

The ESEM investigations revealed the morphogenesis of peltate glandular trichomes, which was divided into five phases. In phase one, new peltate glandular trichomes were initiated; in phase two, they were differentiated; in phase three trichomes grew vigorously; in phase four they were determined; in the fifth and final phase they came to maturity. Volume of glandular trichome during the different phases of morphogenesis varied from 0.25 ´ 10–2mm3 in phase 1, to 1.95 ´ 10–2mm3 in phase 5. More glandular trichomes are placed on the base of the adaxial side of bracts (average 7 mm–2) than on the base of abaxial side (average 5.8 mm–2). In this research, positive spearman's rank order correlations were found between the average number of glandular trichomes and content of a-acids as well as between the average volume of glandular trichomes and content of a- acids.

Keywords

Humulus lupulus; trichome; morphogenesis; ESEM; alpha-acid

Hrčak ID:

66272

URI

https://hrcak.srce.hr/66272

Publication date:

5.4.2011.

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