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

Author(s)

Ramos, Felipe Paulino ; Iwamoto, Lucas ; Piva, Vitor Helio ; Teixeira, Simone Padua

• Document type: Journal article
• Source: PLANTS-BASEL; v. 13, n. 6, p. 23-pg., 2024-03-01.

Abstract

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. (AU)

• FAPESP's process: 21/14731-3 - Development of staminate and pistillate flowers of the hop (Humulus lupulus L. - Cannabaceae) with emphasis on the calyx and gynoecium
• Grantee: Vítor Hélio Piva
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/11089-9 - Elucidation of foliar glands of Rhamnaceae species
• Grantee: Lucas Iwamoto Feitosa
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 22/12533-2 - Biology of secretory cell in rosales species
• Grantee: Simone de Pádua Teixeira
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants
• FAPESP's process: 19/23977-6 - Where does the latex of Humulus lupulus come from? anatomical, histochemical and ultrastructural analyses of the laticifers
• Grantee: Felipe Paulino Ramos
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 18/03691-8 - SECRETORY STRUCTURES IN ROSALES SPECIES
• Grantee: Simone de Pádua Teixeira
• Support Opportunities: Regular Research Grants