Boerhavia diffusa (Nyctaginaceae) rich in several secondary metabolites is recommended for various ailments in the Ayurvedic system of medicine. Present study reveals that the medicinal properties of this plant are largely due to presence of digitiform and capitate trichomes on both vegetative and reproductive parts. These trichomes secret alkaloids, phenols, polysaccharides, proteins, saturate...

BACKGROUND AND AIMS Changes in number of trichomes and in composition and concentrations of their exudates throughout leaf development may have important consequences for plant adaptation to abiotic and biotic factors. In the present study, seasonal changes in leaf trichomes and epicuticular flavonoid aglycones in three Finnish birch taxa (Betula pendula, B. pubescens ssp. pubescens, and B. pub...

Cell differentiation is generally tightly coordinated with the cell cycle, typically resulting in a nondividing cell with a unique differentiated morphology. The unicellular trichomes of Arabidopsis are a well-established model for the study of plant cell differentiation. Here, we describe a new genetic locus, SIAMESE (SIM), required for coordinating cell division and cell differentiation durin...

two-spotted spider mite (tssm) is becoming resistant to many of the pesticides used in the tomatofields. a potential alternative method of control is host plant resistance, which may be mediated byglandular trichomes. in this experiment, level of entrapment and mortality of the pest by type ivglandular trichomes were studied on accessions of lycopersicon hirsutum humb & bonpl, l. pennellii(cor....

Histochemical, micromorphology, ultrastructural and confocal analyses of the trichomes of Micromeria thymifolia (Scop.) Fritsch, were carried out using light microscopy, confocal laser scanning electron microscopy, scanning electron and transmission fluorescent microscopy. Three types of glandular trichomes – peltate, capitate and digitiform and non-glandular trichomes are described on the abax...

Glandular trichomes are currently known only to store mono- and sesquiterpene compounds in the subcuticular cavity just above the apical cells of trichomes or emit them into the headspace. We demonstrate that basipetal secretions can also occur, by addressing the organization of the biosynthesis and storage of pyrethrins in pyrethrum (Tanacetum cinerariifolium) flowers. Pyrethrum produces a div...

Glandular trichomes are metabolic cell factories with the capacity to produce large quantities of secondary metabolites. Little is known about the connection between central carbon metabolism and metabolic productivity for secondary metabolites in glandular trichomes. To address this gap in our knowledge, we performed comparative metabolomics, transcriptomics, proteomics, and 13C-labeling of ty...

The Arabidopsis thaliana MYB5 gene is expressed in trichomes and seeds, including the seed coat. Constitutive expression of MYB5 resulted in the formation of more small trichomes and ectopic trichomes and a reduction in total leaf trichome numbers and branching. A myb5 mutant displayed minimal changes in trichome morphology, while a myb23 mutant produced increased numbers of small trichomes and...

Trichomes reduce herbivore attack on plants by physically and/or chemically inhibiting movement or other activities. Despite evidence that herbivores are negatively affected by trichomes there also reports of insect counter-adaptations that circumvent the plant’s defense. This paper reports on a study that investigated the likely mechanisms employed by larvae of the nymphalid butterfl y, Helico...

The flypaper trap of the protocarnivorous plant Roridula gorgonias is known to capture various insects, even those having a considerable body size, by using an adhesive, visco-elastic resinous secretion released by glandular trichomes of different dimensions. However, recent experimental studies have shown that the adhesion of long tentacle-shaped trichome secretion is not as strong as previous...