Search results
18 sty 2024 · Venation. Leaf veins are vascular bundles coming to the leaf from stem. The arrangement of veins in a leaf is called the venation pattern. Frequently, there is one or more main vein (primary vein) and secondary veins that branch from it. Tertiary veins branch from secondary veins (F igure \(\PageIndex{11}\)).
31 paź 2023 · The arrangement of veins in a leaf is called the venation pattern; monocots have parallel venation, while dicots have reticulate venation. The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled.
18 kwi 2013 · 7. Free-ending veins. Leaves vary strongly in the presence and number of free-ending veins (FEVs; Fig. 2a–d). The morphology of the cells in the FEVs is diverse, often including one to three tracheids with large lumens, and cell walls thickened in discrete hoops (Strain, 1933).
2 cze 2020 · Leaf venation. A leaf contains one or more strands of vascular tissue, called veins, for transporting food and water. The leaf veins, especially the larger ones, are often easily observed on the surface of the leaf. (Shining a light through a leaf can help to make the venation stand out if it is difficult to see.)
1 lip 2005 · We introduce a class of biologically-motivated algorithms for generating leaf venation patterns. These algorithms simulate the interplay between three processes: (1) development of veins towards hormone (auxin) sources embedded in the leaf blade; (2) modification of the hormone source distribution by the proximity of veins; and (3) modification ...
28 wrz 2021 · Leaf architecture ←. Overview of angiosperm phylogeny. Paleoecology: Paleoclimate estimation with plant fossils. Introduction to vascular plant structure: Leaf structure and evolution. Feature image: Leaf of witch hazel (Hamamelis) showing reticulate venation. Credit: E.J. Hermsen (DEAL). Topics covered on this page: Introduction.
22 gru 2008 · We developed a method for extracting spatial vein pattern data from leaf images, such as vein densities and also the sizes and shapes of the vein reticulations. We used this method to quantify leaf venation patterns of the first rosette leaf of Arabidopsis thaliana throughout a series of developmental stages.
