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55 results for “Cotyledon”
Text-fig. 3. Juglandaceae. Carya (a–x). Scale bars = 1 cm. a–e: USNM PAL 772346. Micro-CT scan surface rendering. a, b: Lateral, c: apical, d: basal views. e: Virtual equatorial transverse section. f–n: USNM PAL 772347. f: Lateral view, reflected light, showing path of saw cut for transverse section of (i). g: Basal view, reflected light. h: Apical view, micro-CT surface rendering. i: Physical transverse section displaying locule and cellular preservation of parts of wall. j–n: Virtual sections from micro-CT scan data. j: Transverse section at apical 1/3 of nut. Note narrow lacunae (arrows). k: Longitudinal section parallel to primary septum, traversing one of the cotyledon lobes and showing secondary septum at base. l: Longitudinal section in plane at right angles to (k) in plane of primary septum, showing divergent placental bundles arising from base of nut (arrows). m: Equatorial transverse section showing two lobes of locule separated by primary septum. n: Transverse section near base of nut showing primary and secondary septa, creating four basal lobes of locule; note diverging placental bundles (arrows). o–x: USNM PAL 772351. o: Lateral view of broken nut with exposed locule cast, reflected light. p: Same orientation of nut, micro-CT surface rendering. q: Same specimen lateral view, rotated 90° from (p), micro-CT surface rendering. r: Apical view, reflected light. s–x: Virtual sections from micro-CT in The Early Middle Eocene Wagon Bed Carpoflora Of Central Wyoming, U.S.A.
Text-fig. 3. Juglandaceae. Carya (a–x). Scale bars = 1 cm. a–e: USNM PAL 772346. Micro-CT scan surface rendering. a, b: Lateral, c: apical, d: basal views. e: Virtual equatorial transverse section. f–n: USNM PAL 772347. f: Lateral view, reflected light, showing path of saw cut for transverse section of (i). g: Basal view, reflected light. h: Apical view, micro-CT surface rendering. i: Physical transverse section displaying locule and cellular preservation of parts of wall. j–n: Virtual sections from micro-CT scan data. j: Transverse section at apical 1/3 of nut. Note narrow lacunae (arrows). k: Longitudinal section parallel to primary septum, traversing one of the cotyledon lobes and showing secondary septum at base. l: Longitudinal section in plane at right angles to (k) in plane of primary septum, showing divergent placental bundles arising from base of nut (arrows). m: Equatorial transverse section showing two lobes of locule separated by primary septum. n: Transverse section near base of nut showing primary and secondary septa, creating four basal lobes of locule; note diverging placental bundles (arrows). o–x: USNM PAL 772351. o: Lateral view of broken nut with exposed locule cast, reflected light. p: Same orientation of nut, micro-CT surface rendering. q: Same specimen lateral view, rotated 90° from (p), micro-CT surface rendering. r: Apical view, reflected light. s–x: Virtual sections from micro-CT
◂Fig. 6 Gynoecial development, fruit and seedling of C. crenata %yellow frames), C. cf. grandicalyx %blue frames) and C. sinensis %pink frames; A–F light microscopy, G–K stereo microscopy of endocarp, mesocarp removed; L–O field images; TS in horizontal orientation). A, B TS of anthetic flower %note two to three abortive ovules and strongly stained, peripheral tissue). C, D TS of anthetic flower %note two to three abortive ovules and lignifying portions of prospective mesocarp). E Young fruit %note developing endocarp and flashily pink portions of the mesocarp). F TS of postanthetic flower %note three abortive ovules and lignifying portions of prospective mesocarp). G TS of endocarp, with three developed embryos removed %note scanty endosperm). H Endocarp. J TS of endocarp. K Endocarp. L Immature fruits. M Mature fruits. N Seedlings %note short hypocotyl and long petioles of cotyledons). O Seedlings %note long hypocotyl and short petioles of cotyledons; image taken from cultivated plant, accession number 2012–0005, in the Botanical Garden Munich) %LS, longisection; TS, transverse section; ao, abortive ovule; cot, cotyledon; db, dorsal bundle; c, calyx; ec, endocarp; ens, endosperm; ex, exocarp; fr, fruit; h, hypocotyl; int, integument; lb, lateral bundle; mc, mesocarp; o, ovule; pet, petiolus; sty, style; ut, peripheral tissue; vs, ventral slit) in Observations on flower and fruit anatomy in dioecious species of Cordia (Cordiaceae, Boraginales) with evolutionary interpretations
◂Fig. 6 Gynoecial development, fruit and seedling of C. crenata %yellow frames), C. cf. grandicalyx %blue frames) and C. sinensis %pink frames; A–F light microscopy, G–K stereo microscopy of endocarp, mesocarp removed; L–O field images; TS in horizontal orientation). A, B TS of anthetic flower %note two to three abortive ovules and strongly stained, peripheral tissue). C, D TS of anthetic flower %note two to three abortive ovules and lignifying portions of prospective mesocarp). E Young fruit %note developing endocarp and flashily pink portions of the mesocarp). F TS of postanthetic flower %note three abortive ovules and lignifying portions of prospective mesocarp). G TS of endocarp, with three developed embryos removed %note scanty endosperm). H Endocarp. J TS of endocarp. K Endocarp. L Immature fruits. M Mature fruits. N Seedlings %note short hypocotyl and long petioles of cotyledons). O Seedlings %note long hypocotyl and short petioles of cotyledons; image taken from cultivated plant, accession number 2012–0005, in the Botanical Garden Munich) %LS, longisection; TS, transverse section; ao, abortive ovule; cot, cotyledon; db, dorsal bundle; c, calyx; ec, endocarp; ens, endosperm; ex, exocarp; fr, fruit; h, hypocotyl; int, integument; lb, lateral bundle; mc, mesocarp; o, ovule; pet, petiolus; sty, style; ut, peripheral tissue; vs, ventral slit)
Text-fig. 9. Lusitanispermum choffatii gen. et sp. nov. seeds from the Early Cretaceous Famalicão locality (sample 025), Portugal; Synchrotron radiation X-ray tomographic microscopy (SRXTM, orthoslices). a) Longitudinal orthoslice (yz0769) through the median plane of the seed (S174345) showing expanded exotestal cells (ex, arrow head) in the hilar region and well-preserved cellular nutritive tissue with an embedded tiny embryo (asterisk markes the margin of the embryo); note well-developed mesotesta (me) on the raphal side of seed. b) Longitudinal orthoslice (yz0750) in the median plane showing detail of micropylar part of seed with well-preserved exotesta (ex) and mesotesta (me) and tiny embryo with two rudimentary cotyledons (asterisks mark the margin of the cotyledons); note numerous granular bodies in the cellular nutritive tissue that are probably the remains of protein and lipid bodies. c) Transverse orthoslice (xy0311) through seed below hilum showing the bulging exotesta (arrow heads) (S174472); note that the exotestal cells in this region have thinner walls (arrows). d) Transverse orthoslice (xy0900) through the middle of a seed showing the uneven thickening of the anticlinal walls of the exotestal cells (ex), which are thicker towards the outside and very thin towards the inside; note also mesotesta (me) and the well-preserved cellular nutritive tissue (S174472). Scale bars = 500 µm (a, d); 250 µm (b, c). in Extinct Taxa Of Exotestal Seeds Close To Austrobaileyales And Nymphaeales From The Early Cretaceous Of Portugal
Text-fig. 9. Lusitanispermum choffatii gen. et sp. nov. seeds from the Early Cretaceous Famalicão locality (sample 025), Portugal; Synchrotron radiation X-ray tomographic microscopy (SRXTM, orthoslices). a) Longitudinal orthoslice (yz0769) through the median plane of the seed (S174345) showing expanded exotestal cells (ex, arrow head) in the hilar region and well-preserved cellular nutritive tissue with an embedded tiny embryo (asterisk markes the margin of the embryo); note well-developed mesotesta (me) on the raphal side of seed. b) Longitudinal orthoslice (yz0750) in the median plane showing detail of micropylar part of seed with well-preserved exotesta (ex) and mesotesta (me) and tiny embryo with two rudimentary cotyledons (asterisks mark the margin of the cotyledons); note numerous granular bodies in the cellular nutritive tissue that are probably the remains of protein and lipid bodies. c) Transverse orthoslice (xy0311) through seed below hilum showing the bulging exotesta (arrow heads) (S174472); note that the exotestal cells in this region have thinner walls (arrows). d) Transverse orthoslice (xy0900) through the middle of a seed showing the uneven thickening of the anticlinal walls of the exotestal cells (ex), which are thicker towards the outside and very thin towards the inside; note also mesotesta (me) and the well-preserved cellular nutritive tissue (S174472). Scale bars = 500 µm (a, d); 250 µm (b, c).
Text-fig. 4. Pazlia hilaris gen. et sp. nov. (a, b) from the Early Cretaceous Famalicão locality (sample 025), Portugal (holotype, S175096) and Pazliopsis reyi gen. et sp. nov. (c, d) from the Early Cretaceous Torres Vedras locality (sample 038), Portugal (S174614); Synchrotron radiation X-ray tomographic microscopy (SRXTM, orthoslices). a) Longitudinal orthoslice (xy0984) through the median plane of the seed showing the strongly thickened sclerenchyma under the hilar scar (hi), micropylar slit (mi) and the raphe (ra); note cells of exotesta are almost equally tall on both raphal and anti-raphal sides of the seed and gradually become shorter towards the micropyle. b) Transverse orthoslice (xy0984) through middle of seed showing the thickened cells of the exotesta; note that cells of the exotesta are almost equally tall on both raphal and anti-raphal sides. c) Longitudinal orthoslice (yz0812) through apical part of seed in the median plane showing embryo with two rudimentary cotyledons (asterisks) and surrounding nutritive tissue; note the tiny cells of embryo with central structures we interpret as the fossilized remains of nuclei. d) Detail of (4c) showing tiny embryo with two rudimentary cotyledons (asterisks); nutritive tissue immediately surrounding the embryo is interpreted as endosperm (endo); whether there is any delimitation between this inner endosperm and the outer part of the nutritive tissues is not clear. Scale bars = 250 µm (a–c); 125 µm (d). in Extinct Taxa Of Exotestal Seeds Close To Austrobaileyales And Nymphaeales From The Early Cretaceous Of Portugal
Text-fig. 4. Pazlia hilaris gen. et sp. nov. (a, b) from the Early Cretaceous Famalicão locality (sample 025), Portugal (holotype, S175096) and Pazliopsis reyi gen. et sp. nov. (c, d) from the Early Cretaceous Torres Vedras locality (sample 038), Portugal (S174614); Synchrotron radiation X-ray tomographic microscopy (SRXTM, orthoslices). a) Longitudinal orthoslice (xy0984) through the median plane of the seed showing the strongly thickened sclerenchyma under the hilar scar (hi), micropylar slit (mi) and the raphe (ra); note cells of exotesta are almost equally tall on both raphal and anti-raphal sides of the seed and gradually become shorter towards the micropyle. b) Transverse orthoslice (xy0984) through middle of seed showing the thickened cells of the exotesta; note that cells of the exotesta are almost equally tall on both raphal and anti-raphal sides. c) Longitudinal orthoslice (yz0812) through apical part of seed in the median plane showing embryo with two rudimentary cotyledons (asterisks) and surrounding nutritive tissue; note the tiny cells of embryo with central structures we interpret as the fossilized remains of nuclei. d) Detail of (4c) showing tiny embryo with two rudimentary cotyledons (asterisks); nutritive tissue immediately surrounding the embryo is interpreted as endosperm (endo); whether there is any delimitation between this inner endosperm and the outer part of the nutritive tissues is not clear. Scale bars = 250 µm (a–c); 125 µm (d).
FIGURE 2. A in Cotyledon mckayi (Crassulaceae subfam. Kalanchooideae), a new cremnophytic species from the central Tugela River Basin of KwaZulu-Natal, South Africa
FIGURE 2. A. Cotyledon orbiculata var. oblonga (UMzinyati River valley). B. C. velutina (Mzimkulu River valley). C. C. barbeyi (Mkuze Game Reserve). D. C. nielsii (Dalton Wood). E. Lateral view of single flowers, L–R, C. orbiculata var. oblonga, C. mckayi, C. barbeyi, C. nielsii. E. Frontal view of corolla mouths, L–R, C. orbiculata var. oblonga, C. mckayi, C. barbeyi, C. nielsii. Scale bars: E, F: 13 mm. Photographs by the authors.
FIGURE 1 in Cotyledon mckayi (Crassulaceae subfam. Kalanchooideae), a new cremnophytic species from the central Tugela River Basin of KwaZulu-Natal, South Africa
FIGURE 1. Cotyledon mckayi from the UMzinyati River valley, KwaZulu-Natal, South Africa. A. Inflorescence lateral view. B. Habit of flowering plant. C. Vegetative components. D. Buds in lateral view. E. Habitat on UMzinyati River. F. Pistil with nectar scales. G. Andrew McKay (1968–) for whom the species is named. Scale bars: A: 8 mm; B: 160 mm; C: 95 mm; D: 6 mm; F: 4 mm. Photographs by the authors (A–B, F–G) and A. McKay (C–E).
FIGURE. Seedlings, seeds, embryos, anthers, and pollen in Dicorynia. A–D. Different stages of development in seedlings of D. paraensis, First eophiles unifoliolate and opposite; E–G. Seed of D. guianensis: E. External surface; F. Endosperm of the longitudinally sectioned seed, note the slightly gelatinous upper region; G. Cotyledon and embryo of longitudinally sectioned seed; H. SEM of seed's testa in D. paraensis; I. SEM of endosperm's surface in D. guianensis (notice the presence of circular perforations); J–K. SEM of the hypocotyl-radicular axis of the seed in D. guianensis and D. paraensis; L. SEM of seed's testa in D. guianensis; M–N. SEM of plumule region in embryo of D. guianensis and D. paraensis (note the developed leaf primordia); O. Apex of anther in longer stamen of D. paraensis, showing 4 sporangia and two pores covered by an apicle; P. Apex of anther in shorter stamen of D. guianensis, at least 9 sporangia; Q. Apex of anther in longer stamen of D. guianensis, 8 sporangia; R. Pollen grains in D. paraensis. A–D: Falcão, M.J. 91; E–G, I–J, L–M: Gentry 63030; H, K, N: Berry, P.E. 7460; O: Amaral, E. 618; P, Q: Unknown collector MO1576407; Scale bar. A–D: 2cm; E–G: 3mm; H–L: 1mm; M–N: 100 μm; O-Q: 200μm; R: 5 μm. in A Taxonomic Revision of the Amazonian Genus Dicorynia (Fabaceae: Dialioideae)
FIGURE. Seedlings, seeds, embryos, anthers, and pollen in Dicorynia. A–D. Different stages of development in seedlings of D. paraensis, First eophiles unifoliolate and opposite; E–G. Seed of D. guianensis: E. External surface; F. Endosperm of the longitudinally sectioned seed, note the slightly gelatinous upper region; G. Cotyledon and embryo of longitudinally sectioned seed; H. SEM of seed's testa in D. paraensis; I. SEM of endosperm's surface in D. guianensis (notice the presence of circular perforations); J–K. SEM of the hypocotyl-radicular axis of the seed in D. guianensis and D. paraensis; L. SEM of seed's testa in D. guianensis; M–N. SEM of plumule region in embryo of D. guianensis and D. paraensis (note the developed leaf primordia); O. Apex of anther in longer stamen of D. paraensis, showing 4 sporangia and two pores covered by an apicle; P. Apex of anther in shorter stamen of D. guianensis, at least 9 sporangia; Q. Apex of anther in longer stamen of D. guianensis, 8 sporangia; R. Pollen grains in D. paraensis. A–D: Falcão, M.J. 91; E–G, I–J, L–M: Gentry 63030; H, K, N: Berry, P.E. 7460; O: Amaral, E. 618; P, Q: Unknown collector MO1576407; Scale bar. A–D: 2cm; E–G: 3mm; H–L: 1mm; M–N: 100 μm; O-Q: 200μm; R: 5 μm.
FIGURE 2 in Notes on the nomenclature and taxonomy of Chiastophyllum and Umbilicus oppositifolius (≡Cotyledon oppositifolia, ≡Chiastophyllum oppositifolium) (Crassulaceae subfam. Sempervivoideae)
FIGURE 2. The leaves of most species of Umbilicus, such as U. rupestris (Salisbury 1796: 307) Dandy (1948: 611) shown here as a lithophyte on a rock wall in central Portugal near the town of Serra de Santo António, are peltate, more or less round in outline, and have a navel-like depression in the centre (for which the genus was named). Photograph: Gideon F. Smith.
FIGURE 1 in Notes on the nomenclature and taxonomy of Chiastophyllum and Umbilicus oppositifolius (≡Cotyledon oppositifolia, ≡Chiastophyllum oppositifolium) (Crassulaceae subfam. Sempervivoideae)
FIGURE 1. The leaves of Umbilicus oppositifolius are more or less ovate and, unlike those of most species of Umbilicus, not peltate. Photograph provided by and © of Ray Stephenson, U.K. Reproduced with his permission.
Fig. 1. H.procumbens cotyledon-derived callus tissues grown for 4 in Callus cultures of Harpagophytum procumbens (Burch.) DC. ex Meisn.; production of secondary metabolites and antioxidant activity
Fig. 1. H.procumbens cotyledon-derived callus tissues grown for 4 weeks in Erlenmeyer flasks on agar SH medium with 0.5 mg L−1 picloram (CP0.5 callus line) (A), 2 mg L−1 picloram (CP2 callus line) (B), 0.2 mg L −1 NAA and 1 mg L −1 BAP (CNB callus line) (C). Bar 1 cm.
FIGURE 1. Cardamine cubita. A. Flowering plant with large cotyledons and smaller adult leaves. B. Fruiting plant. C in Cardamine cubita (Brassicaceae), a new species from New Zealand with a remarkable reduction in floral parts
FIGURE 1. Cardamine cubita. A. Flowering plant with large cotyledons and smaller adult leaves. B. Fruiting plant. C. Hair on leaf adaxial surface. D–F. Flowers with two stamens distinctly bent near apex. G–I. Fruiting siliquae. Scale bars: A, B, G, H = 1 mm; C = 0.1 mm; D, E, F, I = 0.5 mm.
Associations among cotyledon developmental stability, canalization and phenotypic plasticity in response to shading and burial depth in five herbaceous species at early seedling stage
<p class="MsoNormal"><strong><span>Premise of research. </span></strong></p> <p class="MsoNormal"><span>Cotyledons have important functions in early seedling stage and have important effects on later stages, but we know little about the relationships among developmental stability, canalization and phenotypic plasticity in cotyledons. </span></p> <p class="MsoNormal"><strong><span>Methodology. </span></strong></p> <p class="MsoNormal"><span>We conducted </span><span><span>a field</span></span><span> experiment with five herbaceous species, by subjecting them to contrasting light conditions and burial depths and measuring their cotyledon size and fluctuating asymmetry (random deviation from perfect bilateral symmetry, indicating developmental stability or instability), coefficient of variation and plasticity of cotyledon size,</span><span> </span><span>to investigate the relationships among</span><span> </span><span>cotyledon developmental stability, canalization and plasticity in response to shading and deep burial. </span></p> <p class="MsoNormal"><strong><span>Pivotal </span><span><span>r</span></span><span>esults. </span></strong></p> <p class="MsoNormal"><em><span>Pharbitis purpurea</span></em><span>, </span><em><span>Convolvulus arvensis</span></em><span> and </span><em><span>Carpesium</span></em><span> </span><em><span>abrotanoides</span></em><span> had increased cotyledon size in response to shading at both burial depths;</span><em><span> Abutilon theophrasti</span></em><span> showed reduced cotyledon size in response to shading vs. full light at shallow depth, but greater cotyledon size </span><span>in response to </span><span>both shading and deep burial. </span><span>Shading increased cotyledon fluctuating asymmetry of</span><em><span> </span></em><em><span>P</span></em><em><span><span>.</span></span></em><em><span> purpurea</span></em><span> and </span><em><span>C</span></em><em><span><span>.</span></span></em><span> </span><em><span>abrotanoides</span></em><span>, while deep burial decreased it. Cotyledon fluctuating asymmetry had positive correlations with coefficient of variation and plasticity in response to shade in shading, with little correlation between coefficient of variation and plasticity. </span></p> <p class="MsoNormal"><strong><span><span>C</span></span><span>onclusions. </span></strong></p> <p class="MsoNormal"><span>Results suggested</span><span> </span><em><span>A</span></em><em><span><span>.</span></span></em><em><span> theophrasti</span></em><span> </span><span>may have greater tolerance for multiple stresses than the other species,</span><span> and deep burial may improve shade tolerance of cotyledons through moderate level of stress selection</span><span>. Both developmental instability</span><span> and decreased canalization may indicate </span><span><span>the</span></span><span> state of faster growth. </span><span>Developmental instability</span><span> can facilitate more-active response to shading in cotyledon, while the relationship between canalization and plasticity should be more complex. </span></p>
Using Cotyledon Perfusion to Study Drugs Transfer Across the Placenta
ClinicalTrials.gov study NCT04400084. IPD Sharing: NO. Countries: 1. Publications: 3.
Associations among cotyledon developmental stability, canalization and phenotypic plasticity in response to shading and burial depth in five herbaceous species at early seedling stage
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Data from: Arabidopsis MKK10-MPK6 mediates red-light-regulated opening of seedling cotyledons through phosphorylation of PIF3
Photomorphogenesis is an important process in which seedlings emerge from soil and begin autotrophic growth. Photomorphogenesis mechanisms include light signal perception, signal transduction, and the modulation of light-responsive genes expression, ultimately leading to cellular and developmental changes. Phytochrome-interacting factors (PIFs) play pivotal roles in negatively regulating photomorphogenesis. Light-induced activation of phytochromes triggers the rapid phosphorylation and degradation of PIFs, but the kinases responsible for the phosphorylation of PIFs are largely unknown. Here, we show that Arabidopsis MPK6 is a kinase involved in phosphorylating PIF3 and regulating red (R) light-induced cotyledon opening, a crucial process during seedling photomorphogenesis. MPK6 was activated by R light, and cotyledon opening angle in R light was reduced in mpk6 seedlings. MKK10, a MAPKK whose function is currently unclear, appears to act as a kinase upstream of MPK6 in regulating cotyledon opening. The activation of MPK6 by MKK10 led to the phosphorylation of PIF3 and accelerated its turnover in transgenic seedlings. Accordingly, the overexpression of PIF3 suppressed the MKK10-induced cotyledon opening. MKK10-MPK6 function downstream of phyB in regulating seedlings cotyledon opening in R light. Therefore, MKK10-MPK6 cascade appears to mediate the regulation of R light-controlled seedling photomorphogenesis,via a mechanism that might involve the phosphorylation of PIF3.
Data from: Chromosomal loci important for cotyledon opening under UV-B in Arabidopsis thaliana
BACKGROUND: Understanding of the genetic architecture of plant UV-B responses allows extensive targeted testing of candidate genes or regions, along with combinations of those genes, for placement in metabolic or signal transduction pathways. RESULTS: Composite interval mapping and single-marker analysis methods were used to identify significant loci for cotyledon opening under UV-B in four sets of recombinant inbred lines. In addition, loci important for canalization (stability) of cotyledon opening were detected in two mapping populations. One candidate locus contained the gene HY5. Mutant analysis demonstrated that HY5 was required for UV-B-specific cotyledon opening. CONCLUSIONS: Structured mapping populations provide key information on the degree of complexity in the genetic control of UV-B-induced cotyledon opening in Arabidopsis. The loci identified using quantitative trait analysis methods are useful for follow-up testing of candidate genes.
FIGURE 3 in Cotyledon mckayi (Crassulaceae subfam. Kalanchooideae), a new cremnophytic species from the central Tugela River Basin of KwaZulu-Natal, South Africa
FIGURE 3. Known geographic distribution range of C. mckayi (■).
Data from: Chromosomal loci important for cotyledon opening under UV-B in Arabidopsis thaliana
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Data from: Arabidopsis MKK10-MPK6 mediates red-light-regulated opening of seedling cotyledons through phosphorylation of PIF3
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Data from: Responses of seedling growth and survival to post-germination cotyledon removal: an investigation among seven oak species
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