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66 results for “leaf shape”
FIGURE 2. Sapium argutum. A. Branch. B–C. Acropetiolar glands. D. Leaf shape and veins pattern. E–F. Leaf margin. G. Inflorescence apex. H. Inflorescence base. I. Staminate flower. J. Pistillate flower. K. Pistillate sepal. L. Seed. A–L. W. Cordeiro 780 in Reinstatement of Sapium sceleratum (Euphorbiaceae), an endemic species from Northeast Brazil, and new circumscription of Sapium argutum
FIGURE 2. Sapium argutum. A. Branch. B–C. Acropetiolar glands. D. Leaf shape and veins pattern. E–F. Leaf margin. G. Inflorescence apex. H. Inflorescence base. I. Staminate flower. J. Pistillate flower. K. Pistillate sepal. L. Seed. A–L. W. Cordeiro 780 (PEUFR).
FIGURE 1. Critoniopsis hermogenesii. A. Reproductive branch. B. Leaf shape. C in Critoniopsis hermogenesii (Vernonieae, Asteraceae), a new endemic species from Serra do Mar Mountain Range, São Paulo state, Brazil
FIGURE 1. Critoniopsis hermogenesii. A. Reproductive branch. B. Leaf shape. C. Types of inflorescences. D. Detail of capitulum. E. Corolla with papillae and trichomes at the apex of the lobes. F. Detail of corolla lobe. G. Anther. H. Style. I. Detail of the sweeping hairs. J. Cypsela. Drawing by Klei Sousa.
Data sets and code for Sullivan and Koski "The role of photosynthetic response to environmental variation in shaping an elevational cline in leaf variegation"
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FIGURE 4. A–J. Pontederia reflexa. A. Habit. B. Different leaves showing the leaf-shape variation. C. Inflorescence. D in Two new species of Pontederia L. (Pontederiaceae Kunth) to South America
FIGURE 4. A–J. Pontederia reflexa. A. Habit. B. Different leaves showing the leaf-shape variation. C. Inflorescence. D. Trichome of the inflorescence rachis and perianth. E. Detail of a flower sectioned in the middle. F. Stamens. G. Trichome of the filament. H. Gynoecium. I. Trichome of the style. J. Dispersion unit. (D.J.L. Sousa 553).
Data from: Leaf shape in Populus tremula is a complex, omnigenic trait.
<p>Leaf shape is a defining feature of how we recognise and classify plant species. Although there is extensive variation in leaf shape within many species, few studies have disentangled the underlying genetic architecture.</p> <p>We characterised the genetic architecture of leaf shape variation in Eurasian aspen (<i>Populus tremula </i>L.) by performing a genome wide association studies (GWAS) for physiognomy traits. To ascertain the roles of identified GWAS candidate genes within the leaf development transcriptional program, we performed gene co-expression network analyses from a developmental series, which is publicly available within the PlantGenIE resource. We additionally used gene expression measurements across the population to analyse GWAS candidate genes in the context of a population-wide co-expression network and to identify genes that were differentially expressed between groups of individuals with contrasting leaf shapes. These data were integrated with expression GWAS (eQTL) results to define a set of candidate genes associated with leaf shape variation.</p> <p>Our results identified no clear adaptive link to leaf shape variation and indicate that leaf shape traits are genetically complex, likely determined by numerous small-effect variations in gene expression. Genes associated with shape variation were peripheral within the population-wide co-expression network, were not highly connected within the leaf development co-expression network and exhibited signatures of relaxed selection. As such, our results are consistent with the omnigenic model.</p>
FIGURE 3. Senecio fernandinus. A. Habitat and habit. B. Capitulum. C. Corolla. D. Involucral bract. E. Leaf shape variability. Pictures A in Two new species of Senecio (Compositae, Senecioneae) from Peru
FIGURE 3. Senecio fernandinus. A. Habitat and habit. B. Capitulum. C. Corolla. D. Involucral bract. E. Leaf shape variability. Pictures A by Luis Mirano, B by Berni Britto; details C–E from P. Gonzáles & E. Becerra 4188 (USM) by H. Beltrán.
FIGURE 2. Leaf and leaflet shape. A–B. Carapa wohllebenii. A. Bouxin 192. B. Fischer 758 in Carapa wohllebenii (Meliaceae), a new tree species from montane forests in the Democratic Republic of Congo, Rwanda, and Burundi
FIGURE 2. Leaf and leaflet shape. A–B. Carapa wohllebenii. A. Bouxin 192. B. Fischer 758/16 (holotype). C–D. Carapa grandiflora. C. Fischer 633/12. D. Dawe 351 (holotype). Drawings by D. Killmann. Scale bar: 5 cm.
FIGURE 5. Mimosa pseudoracemosa. A. Habit. B. Stipule. C. Leaf. D. Interpinnal projection. E. Paraphyllidia. F. and G. Leaflets with different shapes. H in Novelties in Mimosa sect. Mimosa ser. Mimosa subser. Polycephalae: a new species, new status, and new synonyms
FIGURE 5. Mimosa pseudoracemosa. A. Habit. B. Stipule. C. Leaf. D. Interpinnal projection. E. Paraphyllidia. F. and G. Leaflets with different shapes. H. Detail of leaflets margins. I. Detail of the synflorescence. J. Bracteoles. K. Flower. L. Androecium. M. Detail of the filament. N. Anthers. O. Gynoecium. P. Detail of the ovary.
FIGURE 4. Philodendron appendiculatum. A. Habit. B. Leaf shape. C. Inflorescence detail. D. Berries. E–J Philodendron cordatum. E. Habit. F in Araceae from Serra do Brigadeiro State Park, Minas Gerais, Brazil
FIGURE 4. Philodendron appendiculatum. A. Habit. B. Leaf shape. C. Inflorescence detail. D. Berries. E–J Philodendron cordatum. E. Habit. F. Leaf shape, detailed inflorescence, berries. G. Stem. H. Inflorescence. I. Spathe detail. J. Berries.
FIGURE 2. Anthurium atrovinosum. A. Habit. B. Inflorescence before anthesis. C. Berries. Anthurium brigadeiroense. D. Inflorescence after anthesis. E. Berries. Anthurium fontellanum. F. Population. G. Habit. H. Leaf shape. I in Araceae from Serra do Brigadeiro State Park, Minas Gerais, Brazil
FIGURE 2. Anthurium atrovinosum. A. Habit. B. Inflorescence before anthesis. C. Berries. Anthurium brigadeiroense. D. Inflorescence after anthesis. E. Berries. Anthurium fontellanum. F. Population. G. Habit. H. Leaf shape. I. Inflorescence in anthesis. Anthurium gladiifolium J. Inflorescence in anthesis. Anthurium scandens subsp. scandens K. Habit and berries.
Data from: Leaf shape in Populus tremula is a complex, omnigenic trait.
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Data from: A modern ampelography: a genetic basis for leaf shape and venation patterning in Vitis vinifera
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Data from: Relationships between leaf shape and climate in Rhododendron mucronulatum
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Hidden in the DNA: insights on how multiple historical processes and natural history traits shaped patterns of cryptic diversity in an Amazon leaf-litter lizard Loxopholis osvaldoi (Squamata: Gymnophthalmidae).
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Data from: Vertical canopy gradient shaping the stratification of leaf-chewer-parasitoid interactions in a temperate forest
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Data from: Do an ecosystem engineer and environmental gradient act independently or in concert to shape juvenile plant communities? Tests with the leaf-cutter ant Atta laevigata in a Neotropical savanna
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Data from: Resolving distinct genetic regulators of tomato leaf shape within a heteroblastic and ontogenetic context
Leaf shape is mutable, changing in ways modulated by both development and environment within genotypes. A complete model of leaf phenotype would incorporate the changes in leaf shape during juvenile-to-adult phase transitions and the ontogeny of each leaf. Here, we provide a morphometric description of >33,000 leaflets from a set of tomato (Solanum spp) introgression lines grown under controlled environment conditions. We first compare the shape of these leaves, arising during vegetative development, with >11,000 previously published leaflets from a field setting and >11,000 leaflets from wild tomato relatives. We then quantify the changes in shape, across ontogeny, for successive leaves in the heteroblastic series. Using principal component analysis, we then separate genetic effects modulating (1) the overall shape of all leaves versus (2) the shape of specific leaves in the series, finding the former more heritable than the latter and comparing quantitative trait loci regulating each. Our results demonstrate that phenotype is highly contextual and that unbiased assessments of phenotype, for quantitative genetic or other purposes, would ideally sample the many developmental and environmental factors that modulate it.
Data from: The effect of leaf shape on the thermoregulation and frost tolerance of an annual vine, Ipomoea hederacea (Convolvulaceae)
Premise of study: Leaf shape is predicted to have important ecophysiological consequences; for example, theory predicts that lobed leaves should track air temperature more closely than their entire-margined counterparts. Hence, leaf-lobing may be advantageous during cold nights (∼0°C) when there is the risk of damage by radiation frost (a phenomenon whereby leaves fall below air temperature because of an imbalance between radiational heat loss and convective heat gain). Methods: Here, we test whether radiation frost can lead to differential damage between leaf shapes by examining a leaf-shape polymorphism in Ipomoea hederacea, where leaves are either lobed or heart-shaped depending on a single Mendelian locus. We logged leaf temperature during midautumn, and measured chlorophyll fluorescence and survival as proxies of performance. Furthermore, we tested if the leaf-shape locus confers freezing tolerance using freezing assays on leaf tissue from different leaf shapes. Key results: We found that lobed leaves consistently remain warmer than heart-shaped leaves during the night, but that no pattern emerged during the day, and that temperature differences between leaf shapes were typically small. Furthermore, we found that leaf types did not differ in frost tolerance, but that a 1°C decrease leads to a transition from moderate to complete damage. Conclusions: Our results demonstrate that Ipomoea hederacea leaf shapes do experience different nighttime temperatures, and that only minor temperature differences can lead to disparate levels of freezing damage, suggesting that the differential thermoregulation could result in different levels of frost damage.
Fig. 6 Drosera elongata Exell & J.R.Laundon. a. Leaf shape with a pilose petiole and a in Synopsis of the genus Drosera (Droseraceae) in Angola and the Democratic Republic of the Congo
Fig. 6 Drosera elongata Exell & J.R.Laundon. a. Leaf shape with a pilose petiole and a relatively small, elliptic lamina; b. general morphology: very long stems with horizontal leaves and laterally arising, pubescent inflorescences; c. distribution according to the literature; d. province map of Angola and DRC with localities of examined herbarium specimens; e. pollen in tetrads with echinate, conical sculpture elements in low to medium density; f. dry seed 450 × 140 µm. — Scale bars: a = 1 cm; b = 2 cm; e = 10 µm; f = 20 µm.
Data and code associated with "How consistently do species leaf out or flower in the same order? Understanding the factors that shape this characteristic of plant communities."
<p>R script and data used in analyses for the manuscript, "How consistently do species leaf out or flower in the same order? Understanding the factors that shape this characteristic of plant communities." by C. Beiter & T. Crimmins, published in the International Journal of Biometeorology. </p> <p> </p>
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Allen Brain Atlas
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