Leaf venation patterns and principles of evolution e l i b. Within and across species, leaves are enormously diverse in venation architecture. I came across a brilliant set of scripts and applets by nervous system, a design studio working with algorithms to produce jewellery and other designs. Two types of venation are reticulate venation and parallel venation. In an elliptic leaf with cell division at the apical leaf margin, the leaf can generate a typical pinnate venation pattern fig. This study has been undertaken for identification of 30 mangifera indica l. Pdf leaf shape and venation pattern alter the support. Leaf venation can be classified into some characters or patterns that may have taxonomic value for the identification and classification of species, including veinlets, ultimate marginal venation, areolar venation and areolation shape hickey 1973. A constant production hypothesis guides leaf venation. Of the 200 species of conifers in north america, pines, redwoods, firs, spruces, larches, cypress, and cedars are the most familiar ones. This theory is largely based on interspecific comparisons and has never been tested. The digital version of the filemaker pro entry form is on the cd that contains this manual.
In a simple sentence we may say that the arrangement of veins and veinlets in the lamminaleaf blade of leaf is term as venation. In this study, two types of ultimate marginal venation were observed. The development of venation patterns is correlated with the growth of leaf blades. Pdf modeling and visualization of leaf venation patterns. While the differences in foliar physiognomy have attracted numerous researchers, the significance of different leaf shapes and sizes for species niche differentiation is still not entirely understood, partly because of a lack of information on the costs and benefits of specific. We hypothesize that the fraction of biomass in the mid.
This leaf was subjected to a chemical treatment to remove all the soft tissues, leaving only the veins. Compound leaves are further described as pinnately, palmately, and. Parallel venation involves smaller veins running parallel to each other. Through a comparison of leaves of a fern, a dicotyledoneous plant and a typical monocot the great variability of the venation pattern becomes obvious.
In the mature leaf, tertiary veins and veins oflesser categories are notreadily distinguish able. These algorithms simulate the in terplay between three processes. The arrangement of veins in a leaf is called the venation pattern. Studies on leaf venation in selected taxa of the genus ficus. The most common shapes include oval, truncate, elliptical, lancolate, and linear.
It would be nice if they had taught us what a monocotdicot is. Venation pattern analysis of leaf images request pdf. Repeated origin of threedimensional leaf venation releases constraints on the evolution of succulence in plants r. A constant production hypothesis guides leaf venation patterning. Finally, we decided against a fully quantitative approach because many of the most systematically valuable features of leaves are in the venation. In earlier studies, foster 1936, 1952 clearly brought out the diagnostic features in the venation pattern of cleared leaves and advised palaeobotanists to use these for describing fossilised leaf samples.
Pdf description of leaf venation pattern in spathicarpa. This study aimed at characterizing the pattern of leaf venation of rubiaceae, recognizing individual characters among the taxa of this group and testing the use of leaf architecture as a taxonomic. These algorithms simulate the interplay between three processes. This manual is organized in the same order as the database form. An online database for plant image analysis software tools lobet g.
Edwards1 1department of ecology and evolutionary biology, brown university, 80 waterman street, box gw, providence, ri 02912, usa summary succulent water storage is a prominent feature among. The interrelationships between topological or geometric properties of the various leaf venation patterns and functional aspects are far from being well understood. Interestingly, complex shape phenotypes correlate with epidermal features, such as hirsuteness, and reproductive traits, revealing that disparate, potentially adaptive and economically relevant phenotypes cosegregate. A large percentage of leaf shape and venation patterning exhibits high heritability figs. Below is a link to their work followed by a link to a specific paper or algorithmic modelling of leaf venation patterns. The origin of the diversity of leaf venation pattern. Outline of working hypotheses of how leaf shape and venation affect biomass investment in support. Difference between reticulate and parallel venation. Based on the gross venation patterns, the species have been grouped into uni. For leaves of the same length l the location of mass centre centroid, c varies in dependence on the distribution of leaf mass along the leaf length. As a bonus, we share some of the common uses of each tree, like decoration, fuel, furniture, etc. The angiosperm leaf venation is a developmental marvel, including up to 2 m of length per square centimetre of the leaf, arranged in a regular network. Constitutive property of the local organization of leaf.
In order to initiate a causal analysis of venation pattern formation in dicotyledonous plant leaves, we have first studied its developmental profile in vegetative. The arrangement and distribution of veins and veinlets on the lamina of a leaf is called venation. Pdf modeling and visualization of leaf venation patterns adam. Land plants lose vast quantities of water to the atmosphere during photosynthetic gas exchange.
The veins consist of vascular tissues which are important for the transport of food and water. Leaf venation studies of 30 varieties of mangifera indica. Foliage leaf venation is qualitatively different, with welldeveloped minor venation and freely ending veinlets. Modeling and visualization of leaf venation patterns algorithmic. When the veins are irregularly distributed to form a channel, it is known as reticulate venation. Minor venation was measured up to five orders and all varieties studies showed fimbriate venation. Leaf venation patterns in the genus saxifraga saxifragaceae article pdf available in phytotaxa 22122.
Most of the angiosperms with two cotyledons in the seed exhibit reticulate venation. Venation refers to the arrangement of veins in a leaf. Plant species with widely varying leaf shape, size and venation architecture co. Within the leaf blade, numerous transverse or commissura l veins interconnec t adjacen longitudina veins so that, at the level of the smallest order of venation, the pattern is essentially reticulate, a s it for th e dicot figur 1 d. With pinnate venation, the veins all come off the central midrib and go out to the leaf edge. A relationship between vein patterning and leaf shape is obvious in grape. In particular i am trying to replicate their hyphae lamps that are grown using algorithms based on leaf venation.
Reticulate venation involves netlike pattern of arrangement of veins. Pattern and ontogeny of the foliar venation of bobea. To a large extent, the positioning of lobes is determined by the placement of the superior l 2 and inferior l 3 lateral veins, and the shape of the petiolar sinus is determined by the branching angles of the petiolar l 4 veins figs. The midrib is the largest, central vein, becoming the petiole below the blade. Learn leaf venation with free interactive flashcards. Figure 1 global scaling of leaf venation with leaf size. In parallel venation,the veins run parallel to each other from base to tip. In a compound leaf, the midrib of the leaf is branched into different leaflets and is.
Leaf arrangement is mainly limited to two basic petiole attachments. Main veins branch from the midrib into a successively smaller network pinnate venation shows all main veins branching from along midrib palmate venation shows several main veins branching from a common point of midrib at base of blade arcuate venation is essentially pinnate, but main veins curve to. We introduce a class of biologicallymotivated algorithms for generating leaf venation patterns. Choose from 78 different sets of leaf venation flashcards on quizlet. Evolution and function of leaf venation architecture. Manual of leaf architecture pennsylvania state university. We now derive the more specific behavior implied by cf4 as imposed by the first three functions. Venation pattern formation in arabidopsis thaliana vegetative leaves. In angiosperms, a complex network of veins irrigates the leaf, and it is widely held that the density and placement of these veins determines maximum leaf hydraulic capacity and thus maximum photosynthetic rate. The veins which enter the leaf through the petiole are called primary veins or first order veins. The two major types of venation, parallel and reticulate, can both be subdivided, and a third, distinct type of venation is found in ginkgo trees. Suppose the leaf is endowed with a venation pattern, and focus on an areole. Modeling and visualization of leaf venation patterns adam runions martin fuhrer brendan lane pavol federl annega. Leaf shape and venation pattern alter the support investments within leaf lamina in temperate species.
These data collectively indicate that leaf size, longevity, shape and venation pattern can importantly modify the distribution of foliage biomass between support and functional tissues, and thus can alter foliage physiological activity and leaf functioning in environments with different resource availability. When the apical part of the leaf is cut and removed at a young stage, the venation pattern changes to a dichotomous. As this aerole expands, new cvascular strands need to be created. Jan 31, 2018 in a simple sentence we may say that the arrangement of veins and veinlets in the lamminaleaf blade of leaf is term as venation. Leaf shape and venation pattern alter the support investments. Modeling and visualization of leaf venation patterns acm. Pdf we introduce a class of biologicallymotivated algorithms for generating leaf venation patterns. Request pdf venation pattern analysis of leaf images the work investigates pattern recognition methods to detect venation patterns on leaves. It is the pattern, histology, and ontogeny of the minor venation with which the present study is particularly concerned. Linking auxin with photosynthetic rate via leaf venation. Studies on leaf venation in selected taxa of the genus.
Difference between reticulate and parallel venation compare. The design and function of leaf venation are important to plant. Sep 12, 2006 in an elliptic leaf with cell division at the apical leaf margin, the leaf can generate a typical pinnate venation pattern fig. Fully automated quantification of leaf venation structure. The majority of water carried by xylem in roots and shoots leaves plants through a 2d array of venation in photosynthetic laminae. The institute of food and agricultural sciences ifas is an equal opportunity institution authorized to provide research, educational information and other services only to individuals and institutions that function with nondiscrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. On the other hand, broadleaf trees have exactly that. Pattern and ontogeny of the foliar venation of bobea elatior.
Leaf morphological characters are mainly used for classifying a particular genus, species and varieties, but leaf architectural patterns are not much studied. There are no page or colour charges and a pdf version will be provided for each. The origin of the diversity of leaf venation pattern fujita. We found that hvecand1 binds to cullin1, and that the venation patterns of axr1 and hve mutants are similar, which suggest that ubiquitinmediated auxin signaling is required for venation patterning in laminar organs, the only exception being cauline leaves. Before approaching the term parallel venation, the terms primary veins and secondary veins are explained.
Description of leaf venation pattern in spathicarpa hook. The design and function of leaf venation are important to plant performance, with key. Plant processes are increasingly thought to be governed by rules and unifying models, which attempt to scale conducting tissue density in leaves 1, 2, 3 with xylem dimensions and general leaf traits 5, 6. Plants with alternate and spiral leaf arrangements have only one leaf. In most leaves, the primary photosynthetic tissue, the palisade mesophyll, is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of eucalyptus, palisade mesophyll is present on both sides and the leaves are said to be isobilateral. A leaf is a dorsiventrally flattened organ, usually borne above ground and specialized for photosynthesis.
What are some examples of leaves with parallel venation. Leaf tips and bases may also be unique, with names based on their shapes. A simple leaf may be incised to any depth but not down to the midrib or petiole. Developmentally based scaling of leaf venation architecture. The basic vascular pattern of juvenile leaves is elaborated in adult rosette and cauline leaves, such that numbers of sec ondary veins and orders of minor venation are greater. One, which they term type i, has the carbohydratetransporting phloem of secondary vascular bundles arranged centripetally around a primary, central vein, and this pattern seems to have arisen independently eight times. We aimed to initiate new researchers into the breadth of classical and. Most have some form of a needle in the place of flat leaves.
Araceae article pdf available in acta botanica brasilica 211. A chart of tree leaf shape, arrangement, margin, and venation can be used to identify individual tree species. Modeling and visualization of leaf venation patterns. Other qualitative characters of secondary vein angle of divergence, course, intersecondary vein, tertiary vein pattern, higher order venation course, veinlet branching, areole development, areole arrangement and areole shape were undertaken. May 15, 2012 the angiosperm leaf venation is a developmental marvel, including up to 2 m of length per square centimetre of the leaf, arranged in a regular network. The simple venation pattern of hve plants seems to arise from an early patterning defect. The term venation, when used in botany, refers to the distribution of veins in the leaf blade. Studying leaf shape and the arrangement of leaves on a stem is the most common way of identifying a tree in the field during the growing season. This theory is largely based on interspecific comparisons and has never been. In this pattern the veins have ybranches with no small veins interconnecting them fig. With palmate venation, all the veins radiate fanlike from a single point at the leafs base. The developing vein pattern can be assessed once procambial cells are.
Fully automated quantification of leaf venation structure j. Leaf venation is the pattern of veins in the blade of a leaf. Hence it is convenient to refer to the entire intercostal venation exclusive of the obvious intermediates as the minor venation. A compound leaf is a leaf made up of two or more leaflets. Additionally, the higher tissue succulence in these species was associated with two contrasting 3d venation patterns. Leaf venation patterns of 150 species of euphorbia are presented and their value as a diagnostic feature in the genus assessed. Dicotyledons, or plants with two seed leaves, are reticulateveined. Leaf venation studies of 30 varieties of mangifera indica l. The venation patterns of plant leaves have a great beauty, which results from the visual combination of their complexity and regularity. Both the expansion and the formation of new venation are constrained by our model.
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