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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).
1 cze 2013 · This review summarizes current knowledge of interrelationships between the form and function of leaf venation and the evolution of Leaf venation patterns and refers to the topic of individual and intraspecific variation.
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 \(\PageIndex{11}\)). Figure \(\PageIndex{11}\): The main (primary ...
We synthesize classical concepts and the recent literature on a wide range of aspects of leaf venation. We describe 10 major structural features that contribute to multiple key functions, and scale up to leaf and plant performance.
18 kwi 2013 · Leaf vein segmentation plays a crucial role in the fields of botany and biology due to the important physiological functions and unique morphological characteristics of leaf veins.
LEAF VEINS The internal connections of the leaf to the rest of the plant are through veins. Leaf veins are actually vascular bundles. Vascular bundles (recall from Chapter 4) are composed of xylem (to transport water) and phloem (to transport sugars). The pattern they make in leaves is often quite elaborate (Fig. 6.4).
Veins in a branching pattern are called netted veins. A cross section of a leaf blade reveals a layer of cuticle covering a layer of epidermal cells. Beneath the upper epidermis are a layer of standing cells called the palisade mesophyll and a layer of loosely packed cells called the spongy mesophyll.
