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6 results for “Myricaceae”
Genome-structural analyses support an allotetraploid origin of the walnut family from within Myricaceae and shared genome duplications reveal substitution rate variation
<p><span>In lineages of allopolyploid origin, entire parental subgenomes may coexist, with two or more sets of homoeologous chromosomes that differ in gene content and syntenic structure. Presence or absence of genes, and microsynteny along chromosomal blocks, can be used to differentiate subgenomes and can be coded as phylogenetic data. We assembled chromosome-level genomes of representative species across an ancient allopolyploid lineage, the walnut family (Juglandaceae)</span><span>, with <em>Myrica</em> and other Fagales as outgroups, and used genome-structural data to infer a phylogeny. </span><span>Microsynteny (with various collinear block sizes) and gene content analyses, using the dominant or recessive progenitor subgenomes or both, all yielded identical topologies that place <em>Engelhardia</em> (a SE Asian and Central American clade) with <em>Platycarya</em>, an </span><span>enigmatic monospecific taxon endemic in </span><span>East</span> <span>Asia</span><span>, but well-represented in the Paleocene-Eocene of North America and Europe. </span><span>Morphological studies including fossils also found the <em>Platycarya</em>/<em>Engelhardia</em> clade because of leaf architecture, floral morphology, and nut walls without lacunae, but DNA-alignment-based phylogenetics carried out here and in previous studies never detected this uniformly wind-dispersed clade, instead grouping <em>Platycarya</em> with <em>Carya</em> and <em>Juglans</em>. The novel analyses further reveal </span><span>the family's hybrid origin from extinct or unsampled progenitors nested within Myricaceae and that <em>Rhoiptelea</em> <em>chiliantha</em></span><span>, the Chinese sister species to all other Juglandaceae, </span><span>contains proportionally more genes related to DNA repair and evolved at a rate 2.6- to 3.5-times slower than the remaining species</span><span>. Our results have implications for the molecular clock hypothesis and suggest that genomic structure contains so-far undervalued phylogenetic signal</span><span>.</span></p>
FIGURE 2 in A reinstatement and a new combination in Morella subgenus Morella (Myricaceae), with typification of Myrica integrifolia
FIGURE 2. Comparative morphology between Morella integrifolia (A–F) and Morella esculenta (a–c). A, a. pistillate inflorescences; B, b, D. infructescences with fruits; C. young staminate inflorescences; c, E. matured male inflorescences with dehisced anthers; F. persistent staminate inflorescences. Scale bar = 1 cm.
FIGURE 1 in A reinstatement and a new combination in Morella subgenus Morella (Myricaceae), with typification of Myrica integrifolia
FIGURE 1. SEM micrographs of comparative morphology between Morella integrifolia (A–F) and Morella esculenta (a–h). A, a, C, c. indumenta on abaxial foliar epidermis; B, b, d. peltate trichomes; E, e. primary inflorescence branches; F, f. dehisced anther lobes. Scale bar: E, e = 500μm; A, C = 200 μm; a, c, F, f = 100 μm; B = 50 μm; b, d = 10 μm.
Data from: Phylogeny of Morella rubra and its relatives (Myricaceae) and genetic resources of Chinese bayberry using RAD sequencing
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Genome-structural analyses support an allotetraploid origin of the walnut family from within Myricaceae and shared genome duplications reveal substitution rate variation
Open the record for dataset details and reuse information.
FIGURE 3 in A reinstatement and a new combination in Morella subgenus Morella (Myricaceae), with typification of Myrica integrifolia
FIGURE 3. Lectotype of Myrica integrifolia.
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