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8 results for “Myrceugenia”
Data from: Decoupled evolution of foliar freezing resistance, temperature-niche and morphological leaf traits in Chilean Myrceugenia
1. Phylogenetic conservatism of tolerance to freezing temperatures has been cited to explain the tendency of plant lineages to grow in similar climates. However there is little information about whether or not freezing resistance is conserved across phylogenies, and whether conservatism of physiological traits could explain conservatism of realized climatic niches. Here we compared the phylogenetical lability of realized climatic niche, foliar freezing resistance, and four morphological leaf traits that are generally considered adaptations to frost resistance in Chilean species of Myrceugenia, which grow in a wide range of habitats. 2. We estimated the predicted niche occupancy profiles with respect to minimum temperature (minT) of all species. We measured foliar freezing resistance (using chlorophyll fluorescence), leaf size, leaf mass per area (LMA), stomatal and trichome densities of ten individuals per species. Finally, we estimated phylogenetic signal and we performed independent contrast analyses among all variables. 3. We found that both foliar freezing resistance and minT were subject to a significant phylogenetic signal, but the former had a stronger signal. We also detected a significant but weak correlation between them (r=0.49, pone tail= 0.04). Morphological traits evolved independent of any phylogenetic effect. Synthesis. Our results show that freezing resistance evolved in association with temperature niche, but with some delay that could result from phylogenetic inertia. Our results also show that morphological leaf traits are more labile than realized climatic niche and frost tolerance and the former probably evolved associated to microhabitat preferences.
FIGURE 1. Myrceugenia joinvillensis. A in A new species of Myrceugenia (Myrtaceae) from Southern Brazil
FIGURE 1. Myrceugenia joinvillensis. A—Fruits, seeds and embryo, B—Holotype, C—Trilocular ovary (A–C from holotype).
FIGURE 2. Myrceugenia joinvillensis. A in A new species of Myrceugenia (Myrtaceae) from Southern Brazil
FIGURE 2. Myrceugenia joinvillensis. A—Mucronate apex (adaxial surface), B—Mucronate apex (abaxial surface), C—Flowers in leaf axiles, D—Bud, E and F—Bracteoles, G—Calyx-lobes, H—Petals, I—Style, J—Stamens (A–B, E–F and J from holotype; C–D and G–I from Vieira 2785).
FIGURE 4. Myrceugenia bananalensis. A in A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology
FIGURE 4. Myrceugenia bananalensis. A. General view of diaphanized leaf. B. Detail of secondary veins and ultimate marginal in loops (arrow tip). C. Detail of areoles showing veinlets endings (arrow).
FIGURE 1. Myrceugenia bananalensis. A. General view. B in A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology
FIGURE 1. Myrceugenia bananalensis. A. General view. B. Detail of branch vestiture. C. Inflorescense: frontal view. D. Flower bud. E. Open flower: frontal view. F. Petal detail showing glands. G–H. Anther details: frontal and dorsal views. I. Petal and calyx lobe details. J. Tetralocular ovary. K. Fruit and persistent bracteole. (K.M. Gomes-Bezerra & J.E.Q. Faria 31).
FIGURE 3. Myrceugenia bananalensis. A–D. Scanning Electronic Microscopy. A in A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology
FIGURE 3. Myrceugenia bananalensis. A–D. Scanning Electronic Microscopy. A. Abaxial leaf blade surface, stomata (arrow), stomatic crests and one trichome. B. Adaxial leaf blade surface, showing the arrangement of the epicuticular wax in platelets. C. Bracteole showing basal colleters (arrow). D. Tricolpate pollen grain. tr: trichome; cr: stomatic crest.
Data from: Decoupled evolution of foliar freezing resistance, temperature-niche and morphological leaf traits in Chilean Myrceugenia
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FIGURE 2 in A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology
FIGURE 2. Distribution of Myrceugenia bananalensis in Distrito Federal, Brazil.
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