&lt;p&gt;&lt;strong&gt;On reinstating &lt;em&gt;Heteropogon allionii&lt;/em&gt; (Poaceae: Panicoideae)&lt;/strong&gt;&lt;/p&gt;

Drisya, V.; Pradeep, A. K.

doi:10.11646/phytotaxa.429.2.6

Cited by 3 publications

(1 citation statement)

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“…The genus Heteropogon Pers. includes six species distributed from Europe to tropical and subtropical regions of the World and all of the species are also known from India (Clayton et al, 2020;Drisya & Pradeep, 2020). Singh et al (2015) considered H.…”

Section: Introductionmentioning

confidence: 99%

Notes on nomenclature and typification of Heteropogon fischerianus and H. contortus var. distichus (Poaceae)

Kumar¹,

Chakrabarty²,

Bandyopadhyay³

et al. 2020

Rheedea

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Section: Introductionmentioning

confidence: 99%

Notes on nomenclature and typification of Heteropogon fischerianus and H. contortus var. distichus (Poaceae)

Kumar¹,

Chakrabarty²,

Bandyopadhyay³

et al. 2020

Rheedea

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Molecular evolution of a reproductive barrier in maize and related species

Cryan,

Phinney,

Seetharam

et al. 2024

Preprint

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Three cross-incompatibility loci each control a distinct reproductive barrier in domesticated maize (Zea mays ssp. mays) and its wild teosinte relatives. These three loci, Teosinte crossing barrier 1 (Tcb1), Gametophytic factor 1 (Ga1), andGa2, each play a key role in preventing hybridization between populations and are proposed to maintain the barrier between domesticated and wild subspecies. Each locus encodes a matching pair of silk- and pollen-active pectin methylesterases (PMEs). To investigate the diversity and molecular evolution of these gametophytic factor loci, we identified existing and improved models of the responsible genes in a new genome assembly which contains active versions of all three loci. We then examined fifty-two assembled genomes from seventeen species to classify haplotype diversity and identify sites under diversifying selection during the evolution of the causal genes. We show thatGa2, the oldest of these three loci, was duplicated to formGa1at least 12 million years ago.Tcb1, the youngest locus, arose as a duplicate ofGa1before or around the time of diversification of theZeagenus. We find evidence of positive selection during evolution of the functional genes at an active site in the pollen-expressed PME and predicted surface sites in both the silk- and pollen-expressed PMEs. The most common allele at theGa1locus is a conservedga1allele (ga1-O), which is non-coding due to conserved stop codons in full-length gene copies that are between 610 thousand and 1.5 million years old. We show that thega1-Oallele is associated with and likely generates 24-nt siRNAs in developing pollen-producing tissue, and these siRNAs map to functionalGa1alleles. In previously-published crosses, thega1-Oallele associates with reduced function of the typically dominant functional alleles for theGa1andTcb1barriers. Taken together, this seems to be an example of a type of epigenetic trans-homolog silencing known as paramutation functioning at a locus controlling a reproductive barrier.

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Molecular and morphoanatomical characterization of Urocystis heteropogonis sp. nov.: a novel smut fungus infecting Heteropogon contortus

Anwar,

Wahab,

Wahab

et al. 2024

BMC Plant Biol

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Background A new species of smut fungus, Urocystis heteropogonis, was discovered infecting Heteropogon contortus in Shawar Valley, Swat district, Khyber Pakhtunkhwa, Pakistan. The study aimed to characterize this fungus based on its morpho-anatomical and molecular features and clarify its phylogenetic position within the genus Urocystis. Results Urocystis heteropogonis was identified as a novel species, distinct from other Urocystis species. Morphologically, it is characterized by larger spore balls (14–69 × 11–45 μm) and central spores that are 14–28 × 11–20 μm in size, with each spore containing1–8 central spores. The spore walls measure 0.9–2.5 μm in thickness and the species differs in infection patterns compared to other Urocystis species. Phylogenetic analysis based on the ITS and LSU regions of nuclear ribosomal DNA (nrDNA) further confirmed the novelty of the species, placing it within a distinct clade alongside U. agropyri, U. occulta, U. piptatheri, and U. tritici. Conclusions The discovery of Urocystis heteropogonis adds to the diversity of smut fungi infecting grasses and highlights the need for further research into its ecological and agricultural implications. Future studies should focus on the disease’s spread, management, and potential impact on host populations.

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<p><strong>On reinstating <em>Heteropogon allionii</em> (Poaceae: Panicoideae)</strong></p>

Cited by 3 publications

References 0 publications

Notes on nomenclature and typification of Heteropogon fischerianus and H. contortus var. distichus (Poaceae)

Notes on nomenclature and typification of Heteropogon fischerianus and H. contortus var. distichus (Poaceae)

Molecular evolution of a reproductive barrier in maize and related species

Molecular and morphoanatomical characterization of Urocystis heteropogonis sp. nov.: a novel smut fungus infecting Heteropogon contortus

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