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145 results for “trichomes”
Fig. 1 in Peltate glandular trichomes of Colquhounia vestita harbor diterpenoid acids that contribute to plant adaptation to UV radiation and cold stresses
Fig. 1. Morphology, collection and metabolic analysis of Colquhounia vestita peltate glandular trichomes (GTs). (A) C. vestita in bloom in a natural habitat. (B) Peltate GTs on the abaxial leaf surface (scale bar = 10 μm). (C) Capitate GTs on the abaxial leaf surface (scale bar = 10 μm). (D) Intact peltate GTs before laser microdissection (LMD) (scale bar = 100 μm). (E) The remaining leaf tissue after LMD (scale bar = 100 μm). (F) Collected peltate GTs (scale bar = 200 μm). (G) Total ion chromatogram of the methanol extract of microdissected peltate GTs using UPLC-MS/MS. (H–J) MS spectra of peaks 1–3.
Fig. 2 in Peltate glandular trichomes of Colquhounia vestita harbor diterpenoid acids that contribute to plant adaptation to UV radiation and cold stresses
Fig. 2. Chemical structures of 5-epi-hardwickiic acid (1), polyalthic acid (2), and E-communic acid (3).
Fig. 5 in Peltate glandular trichomes of Colquhounia vestita harbor diterpenoid acids that contribute to plant adaptation to UV radiation and cold stresses
Fig. 5. Polyalthic acid improved the Ca2+ concentration in the root tips of A. thaliana seedlings (A–F) and gene expression involved in the Ca2+ signalling pathway (G) upon cold stress. The different letters a, b, c and d indicate significant differences according to one-way ANOVA (p <0.05). Error bars indicate the standard error of the mean (n = 5).
FIGURE 11 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 11. Pollen with partial view of the reticulum and the sulcus. A–B. Krenakanthus ribeiranus (Leme 10220). A. View of the reticulum. B. View of the sulcus covered with condensed exine elements. C. Krenakanthus roseolilacinus (Leme 8922). D. Orthocryptanthus arcanus (Leme 9093). E. Orthocryptanthus santaritensis (Leme 8945). F. Orthocryptanthus vasconcelosianus (Leme 8673). G–J. Orthophytum. G. O. (subg. Orthophytum) fosterianum (Leme 5980). H. O. (subg. Orthophytum) macroflorum (Leme 6001). I. O. (subg. Capixabanthus) pseudovagans (Leme 7028). J. O. (subg. Clavanthus) mello-barretoi (Leme 7243). K. Rokautskyia scaposa (Leme 5219). L. Sincoraea ophiurioides (Leme 2282). M. Cryptanthus beuckeri (Leme 7341). N. Forzzaea flavipetala (Leme 9093). O. Hoplocryptanthus regius (Leme 6372). Bars = 5 μm. SEM photos: A–B. P.S. de Almeida. C–O. H. Halbritter.
FIGURE 9 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 9. Seed morphology in Krenakanthus, seeds in lateral view. A–B. Krenakanthus ribeiranus. C. K. roseolilacinus.. c = chalaza. m = micropyle. r = raphe. Bars = 0.5 mm.
FIGURE 10. Seed anatomy. A, C. Krenakanthus ribeiranus. B, D. K. roseolilacinus. A–B in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 10. Seed anatomy. A, C. Krenakanthus ribeiranus. B, D. K. roseolilacinus. A–B. Seeds in median cross-section. C–D. Detail of the seed coat in anti-raphe. Arrowhead: tegmic cuticle. ar = anti-raphe. en = endosperm. pr = pre-raphe. The numbers indicate the different seed coat layers. 1 = endotegmen. 2 = exotegmen. 3 = endotesta. 4 = exotesta. Bars: A–B = 200 μm. C–D = 50 μm.
FIGURE 8 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 8. Leaf anatomy in Krenakanthus. A, C–D. Krenakanthus ribeiranus. B, E–F: K. roseolilacinus. A–B: leaf median crosssection. C–D. Non-glandular trichome anatomy. E–F: Glandular trichome anatomy. C, E. Trichomes in epidermis context. D. Detail of the stalk. F: detail of the glandular trichome. Arrowhead = stoma. ap = aquiferous parenchyma. bc = basal cells. ch = chlorenchyma. e = epidermis. gc = glandular apical cell. h = hypodermiss. st = stalk. Bars: A–B = 100 μm. C–F = 50 μm.
FIGURE 7. A–F in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 7. A–F. Krenakanthus ribeiranus (J.C.S. Ribeiro 001): A. Side view of the leaf blade, highlighting the spreading, uniseriate, hair-like trichomes on the abaxial and adaxial surfaces. B. Basal portion of the leaf, evidencing the inconspicuous marginal spines. C. The inconspicuous peduncle of the inflorescence. D. Fruits in different stages of maturation. E. Fruits. F. Seeds. Bars = 5 mm (A–B, D–E). Bars = 2 mm (C, F).
FIGURE 2 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 2. The massif of Serra de Santa Maria immediate delimitation and with buffers of 1 km, 3 km, and 5 km of its immediate surroundings. The overlay analyses of these geometries with Mapbiomas historical land use cover data series is presented for each land use and vegetation cover classes remaining proportion.
FIGURE 5. A–F in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 5. A–F. Krenakanthus ribeiranus (J.C.S. Ribeiro 001): A Habit in three stages of flower development. B. Habit, highlighting an individual in fruit stage. C. Small-sized aspect of the leaf rosette in an adult individual. D. Frontal view of the fan blade-like corolla. E. Lateral view of the corolla. F. Abundant seedlings growing not far from mother-plants. Photos: J.C.S. Ribeiro.
FIGURE 1 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 1. Distribution of Krenakanthus ribeiranus and K. roseolilacinus. The Area of Occupancy (AOO) of K. ribeiranus in presented alongside the results of the overlay analyses with Mapbiomas land use cover data series.
FIGURE 3 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 3. Krenakanthus ribeiranus (J.C.S. Ribeiro 001): A. General aspect of the shaded rocky habitat alongside creeks at the type locality. B–D. Subpopulations at the type locality composed of individuals growing on organic-rich, shallow soils accumulated on sandstone rock surfaces among mosses. Photos: J.C.S. Ribeiro.
FIGURE 4 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 4. Leaf margin and indumentum in Krenakanthus. A–B. Krenakanthus roseolilacinus. C–E. K. ribeiranus. A–B. Leaf margin with conspicuous spines. C–D. Leaf margin with inconspicuous spines and leaf blade with trichomes. E. Detail of a non-glandular uniseriate trichome. Arrowhead = spine. t = tector trichome. Bars: A–D = 1 mm. E = 0.5 mm.
FIGURE 6 in A "hairy situation" in Minas Gerais, Brazil: a striking new species of Krenakanthus (Bromeliaceae: Bromelioideae) covered with uniseriate trichomes
FIGURE 6. Krenakanthus ribeiranus (J.C.S. Ribeiro 001; A, C, F–G, I, K, M) and K. roseolilacinus (Leme 8922; B, D–E, H, J, L, N): A–B. Frontal view of the corolla. C–D. Petals and stamens. E. Petal. F. Pistil and the stamens, highlighting the unequal filaments. G–H. Sepals. I–J. Fruits. K–L. Anthers. M–N. Stigma. Bars = 5 mm (C–E, J). Bars = 2 mm (F–I). Bars = 1 mm (K–N). Photos: A. J.C.S. Ribeiro. B–N. E. Leme.
Herbivore-mediated negative frequency-dependent selection underlies a trichome dimorphism in nature
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Data from: The genetics of extreme microgeographic adaptation: an integrated approach identifies a major locus underlying leaf trichome divergence in Yellowstone Mimulus guttatus
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Data from: Herbivore-mediated interaction promotes the maintenance of trichome dimorphism through negative frequency-dependent selection
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Data from: Influence of leaf trichomes on boundary layer conductance and gas-exchange characteristics in Metrosideros polymorpha (Myrtaceae)
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Trichome micromorphology in Alcea L. and allied genera (Malvaceae) and its systematic
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Data from: The genetics of phenotypic plasticity in plant defense: trichome production in Mimulus guttatus
Insect herbivory is a major driving force of plant evolution. Phenotypic plasticity and developmental variation provide a means for plants to cope with variable herbivory. We characterized the genetics of developmental variation and phenotypic plasticity in trichome density, a putative defensive trait of Mimulus guttatus (yellow monkeyflower). Our results are evaluated in relation to the optimal defense theory, which provides testable predictions for plastic and developmental patterns in defense traits. We found that both developmental stage and simulated insect damage affected trichome production, but in different ways. Plants were more likely to produce at least some trichomes on later leaves than on earlier leaves, regardless of damage. Damage did not affect the average probability of producing trichomes, but it did increase the density of hairs on trichome‐positive plants. We mapped trichome quantitative trait loci (QTL) by selectively genotyping a large panel of recombinant inbred lines derived from two highly divergent populations. Several highly pleiotropic QTL influenced multiple aspects of the trichome phenotype (constitutive, developmental, and/or plastic responses). Only one of the QTL influenced trichome induction following damage. In a result that is consistent with a central prediction of optimal defense theory, the high allele at this location was from the ancestral population with low constitutive trichome production.
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