Assessing the utility of selected photosynthetic and related traits in screening Amaranthus dubius Mart. ex Thell. and Galinsoga parviflora Cav. 1796 seedlings for elevated temperature stress tolerance

Areington, Candyce Ann; Neto, Milton Costa Lima; Watt, P.; Sershen,

doi:10.1016/j.sajb.2022.02.037

Cited by 3 publications

(1 citation statement)

References 58 publications

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“…In addition, a previous study evaluating the distribution dynamics of 31 invasive plants from the family Asteraceae showed a dispersal pattern from the southeast to the northwest [24], comparable to G. parviflora's current and potential future expansion direction in this study. Our study further demonstrates that G. parviflora has the ability to widely distribute in Tibet, including under native pine vegetation in some of the remote and alpine mountain forests [46]. These results highlight that G. parviflora can demonstrate phenotypic plasticity, adapt to various environmental conditions as suggested previously [45], and spread to the entirety of Tibet.…”

Section: Discussionsupporting

confidence: 80%

Predicting the Potential Risk Area of the Invasive Plant Galinsoga parviflora in Tibet Using the MaxEnt Model

Wang,

Zeng,

Chen

et al. 2024

Sustainability

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The Tibetan plateau, with complex and diverse ecosystems, is an important ecological security barrier to China. However, climate change and the spread of invasive plant species have imperiled the once pristine and diverse ecosystem of the region. To prevent the further spread and control of invasive plants, it is important to delineate the potential distribution patterns of alien invasive plants at the regional scale across Tibet and understand their responses to climate change. Galinsoga parviflora Cav., a member of the family Asteraceae, is an annual herbaceous plant distributed globally as an invasive weed and possesses characteristics that make it highly invasive, such as a strong ability to proliferate and disperse. The species is also known to have an allelopathic effect. There has been no report on the spatial distribution of G. parviflora in Tibet. Using field survey data, we investigated the risk of G. parviflora invasion and its impacts on the ecological safety of Tibet. We employed the MaxEnt model using the R language and SPSS software to optimize and select model parameters and data. We acquired various environmental variables along with current and future climate change scenarios (two carbon emission scenarios, SSP126 and SSP585, for the years 2050 and 2090) to predict the geographic distribution and potential risk areas in Tibet that G. parviflora can invade. The MaxEnt model accurately predicted the distribution of G. parviflora in Tibet with an average AUC of 0.985. The most suitable environmental conditions in which G. parviflora performed the best in Tibet included a mean annual temperature of 6.2–10.0 °C and an elevation range of 2672–3744 m above sea level. Our results indicate that low precipitation during the coldest quarter of the year (mean temperature −2–3 °C) was the most important variable predicting G. parviflora distribution. The results also showed that the species was hardly found when precipitation in the coldest quarter exceeded 155 mm. The current potential invasion risk areas for G. parviflora included the river valleys of central, southeastern, and eastern Tibet. With future climate change scenarios (i.e., SSP126, SSP585), the suitable habitats for G. parviflora distribution will likely shift to northwest regions from the southeast. Particularly under the highest carbon emission scenario (i.e., SSP585), the potential risk area expands more rapidly, and the center of distribution shifts to northwest regions. These findings provide useful information about the current and future changes in G. parviflora distribution in Tibet, which is crucial for the comprehensive and proactive management and control of G. parviflora under future climate change.

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Section: Discussionsupporting

confidence: 80%

Predicting the Potential Risk Area of the Invasive Plant Galinsoga parviflora in Tibet Using the MaxEnt Model

Wang,

Zeng,

Chen

et al. 2024

Sustainability

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Relative Expression of a Salinity Stress‐Responsive Na⁺/H⁺ Exchanger (NHX) in Root and Leaf Tissues of the African Leafy Vegetable, Amaranthus dubius

Haripershad,

Nakhooda,

Shaik

2024

Food and Energy Security

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Amaranthus dubius, an African leafy vegetable (ALV), is an easy‐to‐grow, annual shrub and a highly nutritious food source, containing elevated levels of essential nutrients in the leaves. Many ALVs, including A. dubius, can tolerate salinity stress, enabling their cultivation on marginal land. However, the widespread propagation of A. dubius as a stable food source has thus far not been realised due partially to the high frequency at which hybridisation occurs, resulting in high genotypic and phenotypic variability. Therefore, to increase the agricultural output capacity of this species on salt‐affected marginal lands, it is important to screen, select and then clonally propagate the identified salinity‐tolerant genotypes to ensure true‐to‐type fidelity in the regenerated population. It is also important, thereafter, to elucidate their underlying gene expression of the stress response. The present study exposed 4‐week‐old A. dubius seedlings to 100, 200 and 400 mM NaCl to determine their degree of salt tolerance. Genotypes were then screened, selected and clonally propagated through cuttings, based on high growth rates and biomass, and salt tolerance. Generally, growth and physiological parameters decreased as substrate salinity increased. However, individual salt‐stressed genotypes demonstrated similar vigour to nonstressed plants and were able to maintain total protein and chlorophyll concentrations despite increasing salinity. The relative expression of an NHX1‐like transcript was quantified in 15 genotypes using degenerately primed real‐time qPCR. The relative expression of the putative NHX1 gene was 6.7 times greater in root tissues of seedlings treated with 400 mM NaCl (10.7 ± 1.8) compared to the roots of untreated seedlings (1.6 ± 1.3), and 2.8‐fold more than leaf tissues harvested from seedlings treated with 400 mM NaCl. Furthermore, the relative electrical conductivity (EC) of root tissues was 10 times greater than the EC of leaf tissues from the same 400 mM NaCl treatment. Numerous genotypes yielded similar chlorophyll content between 200 and 400 mM NaCl treatments, with genotypes salinity‐1 (S1) (3.5 ± 0.2 μg/cm2) and S34 (4.0 ± 0.4 μg/cm2) having the highest concentrations of chlorophyll in the 400 mM group, which was positively correlated with total protein content. Following micropropagation through direct organogenesis, selected clones maintained true‐to‐type traits such as similar chlorophyll, protein and NHX1‐like expression as their parent plants when exposed to 400 mM NaCl. This study revealed that some genotypes demonstrated salt stress tolerance capabilities rivalling established halophytes by regulating the constitutive or inducible expression of an NHX1‐like protein in roots and leaves. The correlation between protein content and NHX1‐like expression was nonlinear and nonproportional, demonstrating the complexity of this response and necessitating further exploration of specific protein families or functional groups conferring salinity tolerance in this species.

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The plasticity of the photosynthetic apparatus and antioxidant responses are critical for the dispersion of Rhizophora mangle along a salinity gradient

et al. 2023

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Assessing the utility of selected photosynthetic and related traits in screening Amaranthus dubius Mart. ex Thell. and Galinsoga parviflora Cav. 1796 seedlings for elevated temperature stress tolerance

Cited by 3 publications

References 58 publications

Predicting the Potential Risk Area of the Invasive Plant Galinsoga parviflora in Tibet Using the MaxEnt Model

Predicting the Potential Risk Area of the Invasive Plant Galinsoga parviflora in Tibet Using the MaxEnt Model

Relative Expression of a Salinity Stress‐Responsive Na⁺/H⁺ Exchanger (NHX) in Root and Leaf Tissues of the African Leafy Vegetable, Amaranthus dubius

The plasticity of the photosynthetic apparatus and antioxidant responses are critical for the dispersion of Rhizophora mangle along a salinity gradient

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Assessing the utility of selected photosynthetic and related traits in screening Amaranthus dubius Mart. ex Thell. and Galinsoga parviflora Cav. 1796 seedlings for elevated temperature stress tolerance

Cited by 3 publications

References 58 publications

Predicting the Potential Risk Area of the Invasive Plant Galinsoga parviflora in Tibet Using the MaxEnt Model

Predicting the Potential Risk Area of the Invasive Plant Galinsoga parviflora in Tibet Using the MaxEnt Model

Relative Expression of a Salinity Stress‐Responsive Na+/H+ Exchanger (NHX) in Root and Leaf Tissues of the African Leafy Vegetable, Amaranthus dubius

The plasticity of the photosynthetic apparatus and antioxidant responses are critical for the dispersion of Rhizophora mangle along a salinity gradient

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Relative Expression of a Salinity Stress‐Responsive Na⁺/H⁺ Exchanger (NHX) in Root and Leaf Tissues of the African Leafy Vegetable, Amaranthus dubius