Ontogeny of the proliferous spikelet in<i>Eleocharis viridans</i>(Cyperaceae)

En esta nota se diferencian, con caracteres morfológicos vegetativos de fácil observación, cuatro especies del género Eleocharis que presentan formas poco usuales, E. minima Kunth, E. viridans Kük. ex Osten, E. canindeyuensis Mereles & S. González y E. confervoides (Poir.) Steud., que habitan en Paraguay. Este trabajo tiene como fin comprender mejor el hábito de crecimiento de las mismas y favorecer su reconocimiento para su correcta recolección.

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“…La proliferación de las espiguillas constituye una alternativa reproductiva de las especies (San Martin et al, 2014)…”

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Especies con espiguillas proliferadas del género Eleocharis (Cyperaceae-Eleocharidae) en la flora de Paraguay

Mereles

López

2022

Bonplandia

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Aerial vegetative diaspores of angiosperms: Terminology, organography, and dispersal

Zona

Howard

2022

Flora

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Genome differentiation, natural hybridisation and taxonomic relationships among Eleocharis viridans, E. niederleinii and E. ramboana (Cyperaceae)

Silva

Souza

Trevisan

et al. 2017

Aust. Systematic Bot.

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The role of natural hybridisation and genome changes in the differentiation and speciation of Eleocharis (Cyperaceae) was addressed through the study of the following three closely related species of the polyphyletic series Tenuissimae: Eleocharis viridans Kük. ex Osten, E. ramboana R.Trevis & Boldrini and E. niederleinii Boech., which often reproduce asexually. Molecular and cytogenetic data were used to understand the genomic and karyotypic relationships in the group. Genomes were compared using internal transcribed spacer–cleaved amplified polymorphic sequence (ITS-CAPS) marker and confirmed with random amplified polymorphic DNA, which allowed identification of different genetic groups, with clear evidence of natural hybrids. Karyotype analysis showed numerical variation from 2n = 20–42, with occurrence of chromosome heteromorphisms and polymorphisms, including variability in 35S rDNA site numbers. Meiotic studies demonstrated irregular pairing in some samples, which is associated with hybridisation and asexual reproduction. Genomic in situ hybridisation (GISH) reactions were conducted using two well defined genetic groups as probes, with 2n = 20 and normal meiosis. Probes were tested against each one of the genetic groups and showed positive, partial and negative GISH results, which supported the molecular analysis data. The results indicated that the three studied species are undergoing an intense process of genomic and karyotypic re-arrangement, which results in overlapping of morphological and genomic characteristics. The present study has exemplified the value of an integrative taxonomic approach to solve conflicts in species delimitation in groups undergoing hybridisation.

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Ontogeny of the proliferous spikelet inEleocharis viridans(Cyperaceae)

Cited by 3 publications

References 37 publications

Especies con espiguillas proliferadas del género Eleocharis (Cyperaceae-Eleocharidae) en la flora de Paraguay

Especies con espiguillas proliferadas del género Eleocharis (Cyperaceae-Eleocharidae) en la flora de Paraguay

Aerial vegetative diaspores of angiosperms: Terminology, organography, and dispersal

Genome differentiation, natural hybridisation and taxonomic relationships among Eleocharis viridans, E. niederleinii and E. ramboana (Cyperaceae)

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