Early Development of the Secretory Cavity of Peltate Glands in Humulus lupulus L. (Cannabaceae)

Kim, Eun-Soo; Mahlberg, Paul G.

doi:10.1016/s1016-8478(23)17507-8

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…Glandular trichomes have undergone extensive study within Cannabaceae, especially in C. sativa [ 2 , 4 , 25 , 39 , 86 ] and H. lupulus [ 30 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 87 ] , with some reports for the genera Trema , Celtis and Pteroceltis [ 88 ]. The prevalence of glandular trichomes in various parts of the plant body, particularly in wind-pollinated species as Hops and other Urticalean Rosids [ 88 , 89 , 90 ], suggests their primary role in defense against herbivory [ 85 , 91 ] rather than attracting pollinators.…”

Section: Discussionmentioning

confidence: 99%

“…The occurrence of glandular trichomes in almost all parts of staminate inflorescences, such as bract, bracteoles, peduncle, calyx, filament and anther connective, is a new report for the species. The lack of studies on staminate inflorescences could be related to the research focus on the peltate glandular trichomes of pistillate flowers, which are extensively researched due to their main role in beer production and potential pharmacological properties [ 8 , 9 , 30 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 94 , 95 , 96 ].…”

Section: Discussionmentioning

confidence: 99%

“…Peltate glandular trichomes, also known as lupulin glands, have received significantly more attention than the laticifer system in this species. However, existing studies primarily focus on proteomics and the description of biochemical pathways of secondary metabolites [ 30 , 31 , 32 , 33 , 34 ], with few records of histochemical tests and ultrastructural analyses [ 35 , 36 , 37 , 38 , 39 ]. Much like in the case of the laticifer system, there are very few records of the presence of secretory idioblasts in H. lupulus .…”

Section: Introductionmentioning

confidence: 99%

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Updating the Knowledge on the Secretory Machinery of Hops (Humulus lupulus L., Cannabaceae)

Ramos,

Iwamoto,

Piva

et al. 2024

Plants

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Cannabaceae species garner attention in plant research due to their diverse secretory structures and pharmacological potential associated with the production of secondary metabolites. This study aims to update our understanding of the secretory system in Hops (Humulus lupulus L.), an economically important species especially known for its usage in beer production. For that, stems, leaves, roots, and inflorescences were collected and processed for external morphology, anatomical, histochemical, ultrastructural and cytochemical analyses of the secretory sites. Our findings reveal three types of secretory structures comprising the secretory machinery of Hops: laticifer, phenolic idioblasts and glandular trichomes. The laticifer system is articulated, anastomosing and unbranched, traversing all plant organs, except the roots. Phenolic idioblasts are widely dispersed throughout the leaves, roots and floral parts of the species. Glandular trichomes appear as two distinct morphological types: capitate (spherical head) and peltate (radial head) and are found mainly in foliar and floral parts. The often-mixed chemical composition in the secretory sites serves to shield the plant from excessive UVB radiation, elevated temperatures, and damage inflicted by herbivorous animals or pathogenic microorganisms. Besides the exudate from peltate glandular trichomes (lupulin glands), latex and idioblast content are also likely contributors to the pharmacological properties of different Hop varieties, given their extensive presence in the plant body.

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