Cryptic diversity within the African aquatic plant Ottelia ulvifolia (Hydrocharitaceae) revealed by population genetic and phylogenetic analyses

Li, Zhizhong; Ngarega, Boniface K.; Lehtonen, Samuli; Gichira, Andrew W.; Karichu, Mwihaki J.; Wang, Qingfeng; Chen, Jin‐Ming

doi:10.1007/s10265-020-01175-2

Cited by 16 publications

(17 citation statements)

References 35 publications

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“…Ottelia cordata (Wallich) Dandy, a member of the Hydrocharitaceae, is an aquatic macrophyte distributed in China, Cambodia, Myanmar and Thailand (Wang et al, 2019;Li et al, 2020). It is a perennial and heterophyllous plant with linear or lanceolate submersed leaves and ovate-cordate floating leaves.…”

Section: Introductionmentioning

confidence: 99%

Responses of Leaf Anatomy and CO2 Concentrating Mechanisms of the Aquatic Plant Ottelia cordata to Variable CO2

et al. 2020

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Acclimation to variable CO 2 was studied in floating leaves of the freshwater monocot Ottelia cordata grown in either low or high CO 2. The most striking anatomical variations responding to high CO 2 included the enlarged upper epidermal cells and the decreased area of epidermal chloroplasts. Stomata that distributed on the upper surface, and the stomatic chamber area, showed no significant response to high CO 2. pH-drift experiments indicated that floating leaves of O. cordata were able to use bicarbonate regardless of CO 2 concentrations. Photosynthetic enzyme activities and patterns of organic acids fluctuation confirmed that floating leaves of O. cordata can operate CAM only at low CO 2 , and perform C 4-like metabolism at both high and low CO 2. Overall, the present results imply that the floating leaves of O. cordata does not just rely on the atmospheric CO 2 for its inorganic carbon, but is also dependent on CO 2 and bicarbonate in the water. By showing these effects of CO 2 variation, we highlight the need for further experimental studies on the regulatory mechanisms in O. cordata floating leaves, that prevent futile cycling among the three CO 2 concentrating mechanisms (bicarbonate use, C 4 , and CAM metabolism) and the strategy for exploiting atmospheric CO 2 , as well as studies on the detailed biochemical pathway for C 4 and CAM metabolism in this species.

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Section: Introductionmentioning

confidence: 99%

Responses of Leaf Anatomy and CO2 Concentrating Mechanisms of the Aquatic Plant Ottelia cordata to Variable CO2

et al. 2020

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“…acuminta. Additionally, genuslevel phylogenetic analyses fail to resolve O. acuminata as a monophyletic unit (Li et al, 2020c). Therefore, the taxonomic delimitation of O. acuminata and its phenotypic varieties needs to be re-evaluated.…”

Section: Introductionmentioning

confidence: 99%

Deciphering the Taxonomic Delimitation of Ottelia acuminata (Hydrocharitaceae) Using Complete Plastomes as Super-Barcodes

Yang

Landis

et al. 2021

Front. Plant Sci.

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Accurate species delimitation and identification, which is a challenging task in traditional morphology-based taxonomy, is crucial to species conservation. Ottelia acuminata (Hydrocharitaceae) is a severely threatened submerged macrophyte endemic to southwestern China. The taxonomy of O. acuminata, which has long been in dispute, remains unresolved, impeding effective conservation and management practices. Here, we aim to address the long-standing issues concerning species boundary and intraspecific subdivision of O. acuminata using complete plastome sequences as super-barcodes. The taxonomic delimitation of O. acuminata was explored using phylogenetic inference and two independent sequence-based species delimitation schemes: automatic barcode gap discovery (ABGD) and multi-rate Poisson tree processes (mPTP). The reciprocally reinforcing results support the reduction of the closely related congeneric species, O. balansae and O. guanyangensis, as two conspecific varieties of O. acuminata. Within the newly defined O. acuminata, accurate varietal identification can be achieved using plastome super-barcodes. These findings will help inform future decisions regarding conservation, management and restoration of O. acuminata. This case study suggests that the use of plastome super-barcodes can provide a solution for species delimitation and identification in taxonomically difficult plant taxa, thus providing great potential to lessen the challenges of inventorying biodiversity, as well as biologically monitoring and assessing threatened species.

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“…Genus Ottelia includes aquatic species possessing a wide distribution in tropical, subtropical, and temperate regions of the globe (Cook and Urmi-König, 1984;Cook et al, 1983). Cryptic speciation observed among speci c species recently has heightened interest for further research on the genus (Li et al, 2020;Li et al, 2019;Ito et al, 2019). Irrespective of the high diversity of the Ottelia species (Fan et al, 2019;Guo et al, 2019;Li et al, 2019;Zhai et al, 2018), few studies have used georeferenced data and statistical models to assess the effect of climate on the expansion or reduction of the geographical distribution of Ottelia species (Guo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Irrespective of the high diversity of the Ottelia species (Fan et al, 2019;Guo et al, 2019;Li et al, 2019;Zhai et al, 2018), few studies have used georeferenced data and statistical models to assess the effect of climate on the expansion or reduction of the geographical distribution of Ottelia species (Guo et al, 2019). In Africa, this genus has been assessed on a molecular and taxonomical basis (Li et al, 2020;Symoens, 2009). However, no previous studies on the continent have evaluated the ENMs of the genus, and only O. acuminata has received attention regarding ENMs elsewhere (Guo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…It is anticipated that every plant species in this region will show a complex feedback mechanism to climate change (Corlett, 2016). Niche separation among Ottelia populations of sympatric species favors long-term coexistence, and the resultant features or the niche disparities cause higher competition within a species' populations than that with other species populations (Li et al, 2020;Chesson, 2000). Therefore, there is the need to assess ENMs for the genus Ottelia to discourse factors that would in uence the distribution, and diversi cation of this genus, as a case study in African freshwater environments, on a climate change basis.…”

Section: Introductionmentioning

confidence: 99%

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Environmental determinants of the current and future distribution of seven Ottelia Pers. species in African freshwater bodies

Ngarega

Nzei

Saina

et al. 2021

Preprint

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Understanding the influence of environmental covariates on plants’ distribution is critical, especially for aquatic plant species. Climate change is likely to alter the distribution of aquatic species. However, knowledge of this change on the burden of aquatic macroorganisms is often fraught with difficulty. Ottelia Pers., a model genus for studying the evolution of the aquatic family Hydrocharitaceae, is mainly distributed in slow-flowing creeks, rivers or lakes throughout the world’s pantropical areas. Due to recent rapid climate changes, the natural Ottelia populations have declined significantly. In the present study, we use maximum entropy (MaxEnt) to explore the environmental drivers of seven Ottelia species distribution in African freshwater bodies. The models use known background points to determine how environmental covariates vary spatially and produce continental maps of these species’ distribution. We also estimate the possible influences of the optimistic and extreme pessimistic Intergovernmental Panel on Climate Change (IPCC) pathway scenarios and identify high suitability areas under these scenarios. Model performances were statistically significant than random expectations with Area Under Curve (AUC) values above 0.831, indicating the good performance of the models. We observe that our studied Ottelia species had distinct spatial patterns influenced by climate variations (e.g. Bio9- mean temperature of driest quarter, Bio12- annual precipitation, and Bio14- Precipitation of the driest month). While there is a lack of accord in defining the limiting factors for the distribution of the seven species, it is clear that water-temperature conditions have promising effects when kept within optimal ranges. Niche overlap analyses showed that most Ottelia species have similar but not equivalent climatic niches. In addition, considering the expected warming in the future, the persistence and survival of the Ottelia species in Africa could be compromised. The present findings provide a theoretical basis for the distribution of various Ottelia species in Africa.

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Cryptic diversity within the African aquatic plant Ottelia ulvifolia (Hydrocharitaceae) revealed by population genetic and phylogenetic analyses

Cited by 16 publications

References 35 publications

Responses of Leaf Anatomy and CO2 Concentrating Mechanisms of the Aquatic Plant Ottelia cordata to Variable CO2

Responses of Leaf Anatomy and CO2 Concentrating Mechanisms of the Aquatic Plant Ottelia cordata to Variable CO2

Deciphering the Taxonomic Delimitation of Ottelia acuminata (Hydrocharitaceae) Using Complete Plastomes as Super-Barcodes

Environmental determinants of the current and future distribution of seven Ottelia Pers. species in African freshwater bodies

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