English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The leaf ultrastructure of five Xyris species were examined using scanning electron microscope (SEM), transmission electron microscope (TEM) and histochemical methods. All studied leaves show some features in epidermis and mesophyll, which were of considerable adaptative significance to drought stress. Such features included the occurrence of a pectic layer on the stomatal guard cells and the presence of a network of pectic compounds in the cuticle. Pectic compunds were also in abundance in lamellated walls of the mesophyll cells and on the inner surface of the sclerified cell walls of the vascular bundle sheaths. There were also specialized chlorenchymatous "peg cells" in the mesophyll and drops of phenolic compounds inside the epidermal cells. Foi estudada a ultra-estrutura foliar de cinco espécies brasileiras de Xyris, utilizando microscópio eletrônico de varredura (MEV), microscópio eletrônico de transmissão (MET) e métodos histoquímicos. Na epiderme e mesofilo de todas as folhas estudadas encontram-se caracteres que podem ser interpretados como adaptativos a condições xéricas. Tais caracteres incluem a presença de uma camada parietal interna de natureza péctica nas células oclusivas e a ocorrência de finas ramificações elétron-densas, também de natureza péctica, formando uma rede na camada cuticular. Compostos pécticos também são freqüentes nas paredes lameladas das células do mesofilo e na superfície interna das paredes esclerificadas das células da bainha dos feixes vasculares. Ocorrem, ainda, acúmulos de compostos fenólicos no vacúolo das células epidérmicas e células especializadas no mesofilo, denominadas "peg cells"

Submicroscopical Features of Leaves of Xyris Species