Micromorphology of epicuticular waxes in genus Mimosa (Fabaceae)

Abstract

Epicuticular waxes crystallize on the foliar surface with different morphologies, which can be taxonomically relevant features in many taxa. Their morphological analysis was based on scanning electron microscopy (SEM) images on herbarium specimens of selected sections of Mimosa. The present work is the first detailed description and classification of the epidermal micromorphology in the genus Mimosa, focusing on section Calothamnos and Mimosa series Mimosa, subseries Dolentes and Brevipedes. We also describe different wax crystallization morphologies present in these taxa, identifying three different crystallization types: film, plates, and platelets. Novel epidermal micromorphologies have been described, such as papillae in M. lepidorepens. Results allow grouping taxa of the studied sections, contributing to clarifying their taxonomy. SEM images of epicuticular waxes and leaf surfaces could be a new tool for performing a new taxonomic treatment of section Mimosa subser. Dolentes and subser. Brevipedes, and section Calothamnos.

Image-based approach for postharvest characterization of Red Torch inflorescences

“…Therefore, wax is naturally present in the epidermis of the Red Torch. Epicuticular waxes present in plants constitute the first contact surface between the plant and the environment, acting as protection against water loss and a barrier against pathogens, and dissipating excess heat or radiation by forming a bright and reflective layer (Grohar et al 2023). Although Grohar et al (2023) observed the presence Image-based characterization of Red Torch Bragantia, Campinas, 83, e20230194, 2024 of natural wax in the bracts, the amounts of wax in the involucral and floral bracts were not determined, and no difference in this amount was observed in relation to the inflorescence opening point when they were harvested.…”

“…Epicuticular waxes present in plants constitute the first contact surface between the plant and the environment, acting as protection against water loss and a barrier against pathogens, and dissipating excess heat or radiation by forming a bright and reflective layer (Grohar et al 2023). Although Grohar et al (2023) observed the presence Image-based characterization of Red Torch Bragantia, Campinas, 83, e20230194, 2024 of natural wax in the bracts, the amounts of wax in the involucral and floral bracts were not determined, and no difference in this amount was observed in relation to the inflorescence opening point when they were harvested. Understanding the specific characteristics of Red Torch, such as hydrophobicity, high fluid movement inside the cells, and high levels of natural wax, assists in decision-making regarding the use of postharvest coatings to increase durability.…”