A molecular, morphological and cytological investigation of the identity of non-native<i>Ludwigia</i>(Onagraceae) populations in Britain

Armitage, J. D.; Könyves, Kálmán; Bailey, J. P.; David, J. C.; Culham, Alastair

doi:10.1179/2042349713y.0000000023

Cited by 16 publications

(24 citation statements)

References 24 publications

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“…Our morphological observations complement the cytological observations to differentiate species studied here in the field. For the diploid species, rare pneumatophores and yellow flowers in Lpm were previously observed (Dandelot, 2004;Armitage et al, 2013).…”

Section: Discussionmentioning

confidence: 66%

“…We recorded the colour of the flowers and roots and the pneumatophore form to characterize collected Ludwigia species, following the morphological traits considered in the Ludwigia sp. description (Armitage et al, 2013; Thouvenot et al, 2013). Morphological observations for each species were randomly made on at least 30 plants in the greenhouse and confirmed in natura on 15 plants in 15 and 36 populations of Lpm and Lgh in France, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Genomic relationships among diploid and polyploid species of the genusLudwigiaL. sectionJussiaeausing a combination of molecular cytogenetic, morphological, and crossing investigations

Barloy

Lemus

Krueger‐Hadfield

et al. 2023

Preprint

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The genus Ludwigia L. section Jussiaea is composed of a polyploid species complex with 2x, 4x, 6x and 10x ploidy levels, suggesting possible hybrid origins. The aim of the present study is to understand the genomic relationships among diploid and polyploid species in the section Jussiaea. Morphological and cytogenetic observations, controlled crosses, genomic in situ hybridization (GISH), and flow cytometry were used to characterize species, ploidy levels, ploidy patterns, and genomic composition across taxa. Genome sizes obtained were in agreement with the diploid, tetraploid, hexaploid, and decaploid ploidy levels. Results of GISH showed that progenitors of Ludwigia stolonifera (4x) were Ludwigia peploides subsp. montevidensis (2x) and Ludwigia helminthorrhiza (2x), which also participated for one part (2x) to the Ludwigia ascendens genome (4x). Ludwigia grandiflora subsp. hexapetala (10x) resulted from the hybridization between L. stolonifera (4x) and Ludwigia grandiflora subsp. grandiflora (6x). One progenitor of L. grandiflora subsp. grandiflora was identified as L. peploides (2x). Our results suggest the existence of several processes of hybridization, leading to polyploidy, and possibly allopolyploidy, in the section Jussiaea due to the diversity of ploidy levels. The success of GISH opens up the potential for future studies to identify other missing progenitors in Ludwigia L. as well as other taxa.

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Section: Discussionmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Genomic relationships among diploid and polyploid species of the genusLudwigiaL. sectionJussiaeausing a combination of molecular cytogenetic, morphological, and crossing investigations

Barloy

Lemus

Krueger‐Hadfield

et al. 2023

Preprint

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“…Armitage et al. () described two forms of water primrose, one aquatic and one terrestrial, showing that the terrestrial form had more root biomass, shorter internodes and stems, and more secondary ramifications, being generally more stressed and exhibiting slower growth than the aquatic form (Meisler , Lambert et al. , Haury et al.…”

Section: Discussionmentioning

confidence: 99%

“…4, 5a). Armitage et al (2013) described two forms of water primrose, one aquatic and one terrestrial, showing that the terrestrial form had more root biomass, shorter internodes and stems, and more secondary ramifications, being generally more stressed and exhibiting slower growth than the aquatic form (Meisler 2009, Lambert et al 2010, Haury et al 2014. These characteristics suggest that the terrestrial form of water primrose cannot spread as fast as the aquatic form, likely explaining why we observed water primrose occupying aquatic habitats first and then, when it was not able to occupy deeper open water, it expanded over the terrestrial habitat.…”

Section: Discussionmentioning

confidence: 99%

“…peploides and L. grandiflora ssp. hexapetala (Zardini et al 1991, Rejm ankov a 1992, Okada et al 2009, Armitage et al 2013. Water primrose, although nominally rooted, develops adventitious roots that can draw nutrients directly from the water, which allow them to form floating canopies that extend several meters into the channel from the shore (Cook 1990, Rejm ankov a 1992.…”

Section: Study Systemmentioning

confidence: 99%

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Water primrose invasion changes successional pathways in an estuarine ecosystem

et al. 2018

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Invasive species fundamentally change the bio‐physical and ecological characteristics of the ecosystems they invade. Rapidly expanding invasive species may facilitate the spread of other invasive species, and successive invasion events may lead to novel species interactions that may push the system beyond its equilibrium state and change successional pathways. Knowing the direction of the invasion front may be useful to predict impacts of invasive species. Water primrose (Ludwigia spp.), one of the invasive floating macrophytes in the Sacramento‐San Joaquin River Delta (hereafter, Delta), has increased in cover rapidly over the past three decades likely outcompeting native and non‐native species, changing their functional relationships, with cascading effects in the macrophyte communities of the aquatic ecosystem. In this study, we analyze the directionality of water primrose invasion and assess which spaces it occupies, whether it has overcrowded or outcompeted other vegetation communities, and its implications for succession in the Delta. We used imaging spectroscopy data acquired in June of 2004, June of 2008, November of 2014, and October of 2016 for the 2500 km2 of the Delta to map the communities of submerged macrophytes, floating macrophytes, and emergent marsh. We found that water primrose cover increased fourfold in the Delta over the past 13 yr, changing significantly in the central Delta and Liberty Island region from 122 ha in 2004 to 471 ha in 2016. Water primrose expanded first by spreading over open water and submerged macrophytes and, when that habitat was exhausted, primrose invasion switched direction and encroached into emergent marsh. This bilateral expansion to both open water and the marsh is likely to change rates of succession and affect the restoration of the native Delta marshes. Understanding the mechanisms behind the expansion dynamics of this invasive will allow managers to counter its impact on newly established vulnerable marshes.

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A morphological investigation of the alien Ludwigia species in Italy: towards a new key for unambiguous identification

Pelella,

Ceschin

2024

Plant Biosystems - An International Journal Dealing with all As

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A molecular, morphological and cytological investigation of the identity of non-nativeLudwigia(Onagraceae) populations in Britain

Cited by 16 publications

References 24 publications

Genomic relationships among diploid and polyploid species of the genusLudwigiaL. sectionJussiaeausing a combination of molecular cytogenetic, morphological, and crossing investigations

Genomic relationships among diploid and polyploid species of the genusLudwigiaL. sectionJussiaeausing a combination of molecular cytogenetic, morphological, and crossing investigations

Water primrose invasion changes successional pathways in an estuarine ecosystem

A morphological investigation of the alien Ludwigia species in Italy: towards a new key for unambiguous identification

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