ORCID Profile
0000-0002-5529-7599
Current Organisation
University of Nottingham
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Publisher: Wiley
Date: 11-01-2023
DOI: 10.1111/NPH.18704
Abstract: A warming climate coupled with reductions in water availability and rising salinity are increasingly affecting rice ( Oryza sativa ) yields. Elevated temperatures combined with vapour pressure deficit (VPD) rises are causing stomatal closure, further reducing plant productivity and cooling. It is unclear what stomatal size (SS) and stomatal density (SD) will best suit all these environmental extremes. To understand how stomatal differences contribute to rice abiotic stress resilience, we screened the stomatal characteristics of 72 traditionally bred varieties. We found significant variation in SS, SD and calculated anatomical maximal stomatal conductance ( g smax ) but did not identify any varieties with SD and g smax as low as transgenic OsEPF1oe plants. Traditionally bred varieties with high SD and small SS (resulting in higher g smax ) typically had lower biomasses, and these plants were more resilient to drought than low SD and large SS plants, which were physically larger. None of the varieties assessed were as resilient to drought or salinity as low SD OsEPF1oe transgenic plants. High SD and small SS rice displayed faster stomatal closure during increasing temperature and VPD, but photosynthesis and plant cooling were reduced. Compromises will be required when choosing rice SS and SD to tackle multiple future environmental stresses.
Publisher: Springer Science and Business Media LLC
Date: 22-05-2020
DOI: 10.1038/S42003-020-0990-5
Abstract: During plant growth, sodium (Na + ) in the soil is transported via the xylem from the root to the shoot. While excess Na + is toxic to most plants, non-toxic concentrations have been shown to improve crop yields under certain conditions, such as when soil K + is low. We quantified grain Na + across a barley genome-wide association study panel grown under non-saline conditions and identified variants of a Class 1 HIGH-AFFINITY-POTASSIUM-TRANSPORTER ( HvHKT1 )-encoding gene responsible for Na + content variation under these conditions. A leucine to proline substitution at position 189 (L189P) in HvHKT1 disturbs its characteristic plasma membrane localisation and disrupts Na + transport. Under low and moderate soil Na + , genotypes containing HvHKT1:5 P189 accumulate high concentrations of Na + but exhibit no evidence of toxicity. As the frequency of HvHKT1:5 P189 increases significantly in cultivated European germplasm, we cautiously speculate that this non-functional variant may enhance yield potential in non-saline environments, possibly by offsetting limitations of low available K + .
Publisher: Springer Science and Business Media LLC
Date: 13-06-2023
DOI: 10.1038/S41467-023-38880-0
Abstract: Cell type-specific mapping of element distribution is critical to fully understand how roots partition nutrients and toxic elements with aboveground parts. In this study, we developed a method that combines fluorescence-activated cell sorting (FACS) with inductively coupled plasma mass spectrometry (ICP-MS) to assess the ionome of different cell populations within Arabidopsis thaliana roots. The method reveals that most elements exhibit a radial concentration gradient increasing from the rhizodermis to inner cell layers, and detected previously unknown ionomic changes resulting from perturbed xylem loading processes. With this approach, we also identify a strong accumulation of manganese in trichoblasts of iron-deficient roots. We demonstrate that confining manganese sequestration in trichoblasts but not in endodermal cells efficiently retains manganese in roots, therefore preventing toxicity in shoots. These results indicate the existence of cell type-specific constraints for efficient metal sequestration in roots. Thus, our approach opens an avenue to investigate element compartmentation and transport pathways in plants.
Publisher: Cold Spring Harbor Laboratory
Date: 14-05-2022
DOI: 10.1101/2022.05.13.491841
Abstract: A warming climate coupled with reductions in water availability and rising salinity are increasingly affecting rice yields ( Oryza sativa L.). Elevated temperatures are causing vapour pressure deficit (VPD) rises, leading to stomata closure, further reducing plant productivity and cooling. It is unclear which conformation of stomatal size (SS) and stomatal density (SD) will best suit these future environmental extremes. To understand the influence of stomatal characteristics on rice abiotic stress tolerance, we screened the stomatal characteristics of 72 traditionally-bred varieties. We found significant variation in SS, SD and maximal stomatal conductance ( g smax ) but did not identify any varieties with SD and g smax as low as the genetically manipulated stomatal development mutant OsEPF1oe . Traditionally-bred varieties with high SD and small SS (resulting in high g smax ) typically had lower biomasses, and these plants were more resilient to drought than low SD and large SS plants, which were physically larger. None of the varieties tested were as resilient to drought or salinity as low SD OsEPF1oe mutants. High SD and small SS rice displayed faster stomatal closure during rising VPD, but photosynthesis and plant cooling were reduced. Compromises will be required when choosing rice SS and SD to tackle multiple future environmental stresses.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Paulina Flis.