Comparative ultrastructure of trichomes on various organs of <scp> <i>Rosa roxburghii</i> </scp>

Chestnut rose, R. roxburghii Tratt. (Rosaceae) (RR) is an important crop in China due to its nutritional and medicinal values. RR frequently produces trichomes on the surfaces of a diverse range organs, however genetic component exists control trichome development, with some cultivars having significantly fewer others. Certain varieties have fruits that are thickly covered macroscopic trichomes, which undesirable trait for fruit processing consumption. However, smooth-fruit exist, such as f. esetosa Ku (RRE). Despite their economic importance, anatomical features not been explored detail these two chestnut rose germplasms. Here, we investigate ultrastructure distributed stem, sepal, RRE using transmission electron microscopy (TEM). The internal structure stem prickle was oval shape did contain nucleoli or other organelles. cell walls prickles thick intercellular spaces occupied liquid, whereas cells wall thin air-filled spaces. sepal acicular glandular (GTs) sepals had similar vacuole sizes, cytoplasm content, spaces, arrangement plastids within cells. there were osmiophilic granules present GTs RRE. flagelliform germplasms composed rod-shaped Although structure, both contained starch grains visible thylakoid membranes, thinner higher proportion more evenly across cell. There stained heavily osmium tetroxide occurred infrequently but observed RR. On RR, shared morphology, size well space. Both stain tetroxide, grains. These differences may be related developmental processes biological functions trichomes. results also suggest good candidates further study ontogeny genus subsequent breeding smooth organ this species.