ORCID Profile
0000-0002-4858-803X
Current Organisation
Vietnam National University of Agriculture
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Publisher: Wiley
Date: 30-09-2015
DOI: 10.1111/NPH.13084
Abstract: Bundle sheath extensions ( BSE s) are key features of leaf structure whose distribution differs among species and ecosystems. The genetic control of BSE development is unknown, so BSE physiological function has not yet been studied through mutant analysis. We screened a population of ethyl methanesulfonate ( EMS )‐induced mutants in the genetic background of the tomato ( S olanum lycopersicum ) model M icro‐ T om and found a mutant lacking BSE s. The leaf phenotype of the mutant strongly resembled the tomato mutant obscuravenosa ( obv ). We confirmed that obv lacks BSE s and that it is not allelic to our induced mutant, which we named obv‐2 . Leaves lacking BSE s had lower leaf hydraulic conductance and operated with lower stomatal conductance and correspondingly lower assimilation rates than wild‐type leaves. This lower level of function occurred despite similarities in vein density, midvein vessel diameter and number, stomatal density, and leaf area between wild‐type and mutant leaves, the implication being that the lack of BSE s hindered water dispersal within mutant leaves. Our results comparing near‐isogenic lines within a single species confirm the hypothesised role of BSE s in leaf hydraulic function. They further pave the way for a genetic model‐based analysis of a common leaf structure with deep ecological consequences.
Publisher: Wiley
Date: 08-07-2021
DOI: 10.1111/PCE.14129
Abstract: Foliar water uptake (FWU) occurs in plants of erse ecosystems however, the ersity of pathways and their associated FWU kinetics remain poorly resolved. We characterized a novel FWU pathway in two mangrove species of the Sonneratia genus, S. alba and S. caseolaris. Further, we assessed the influence of leaf wetting duration, wet-dry seasonality and leaf dehydration on leaf conductance to surface water (K
Publisher: Wiley
Date: 20-06-2017
DOI: 10.1111/PCE.12962
Abstract: Leaf structure and water relations were studied in a temperate population of Avicennia marina subsp. australasica along a natural salinity gradient [28 to 49 parts per thousand (ppt)] and compared with two subspecies grown naturally in similar soil salinities to those of subsp. australasica but under different climates: subsp. eucalyptifolia (salinity 30 ppt, wet tropics) and subsp. marina (salinity 46 ppt, arid tropics). Leaf thickness, leaf dry mass per area and water content increased with salinity and aridity. Turgor loss point declined with increase in soil salinity, driven mainly by differences in osmotic potential at full turgor. Nevertheless, a high modulus of elasticity (ε) contributed to maintenance of high cell hydration at turgor loss point. Despite similarity among leaves in leaf water storage capacitance, total leaf water storage increased with increasing salinity and aridity. The time that stored water alone could sustain an evaporation rate of 1 mmol m
Publisher: Oxford University Press (OUP)
Date: 19-01-2015
DOI: 10.1093/AOB/MCU257
Publisher: Wiley
Date: 25-07-2017
DOI: 10.1111/PCE.12788
Abstract: A three-domain pressure-volume relationship (PV curve) was studied in relation to leaf anatomical structure during dehydration in the grey mangrove, Avicennia marina. In domain 1, relative water content (RWC) declined 13% with 0.85 MPa decrease in leaf water potential, reflecting a decrease in extracellular water stored primarily in trichomes and petiolar cisternae. In domain 2, RWC decreased by another 12% with a further reduction in leaf water potential to -5.1 MPa, the turgor loss point. Given the osmotic potential at full turgor (-4.2 MPa) and the effective modulus of elasticity (~40 MPa), domain 2 emphasized the role of cell wall elasticity in conserving cellular hydration during leaf water loss. Domain 3 was dominated by osmotic effects and characterized by plasmolysis in most tissues and cell types without cell wall collapse. Extracellular and cellular water storage could support an evaporation rate of 1 mmol m
Publisher: Wiley
Date: 12-06-2021
DOI: 10.1111/NPH.17461
Abstract: The mangrove Avicennia marina adjusts internal salt concentrations by foliar salt secretion. Deliquescence of accumulated salt causes leaf wetting that may provide a water source for salt‐secreting plants in arid coastal wetlands where high nocturnal humidity can usually support deliquescence whereas rainfall events are rare. We tested the hypotheses that salt deliquescence on leaf surfaces can drive top‐down rehydration, and that such absorption of moisture from unsaturated atmospheres makes a functional contribution to dry season shoot water balances. Sap flow and water relations were monitored to assess the uptake of atmospheric water by branches during shoot wetting events under natural and manipulated microclimatic conditions. Reverse sap flow rates increased with increasing relative humidity from 70% to 89%, consistent with function of salt deliquescence in harvesting moisture from unsaturated atmospheres. Top‐down rehydration elevated branch water potentials above those possible from root water uptake, subsidising transpiration rates and reducing branch vulnerability to hydraulic failure in the subsequent photoperiod. Absorption of atmospheric moisture harvested through deliquescence of salt on leaf surfaces enhances water balances of Avicennia marina growing in hypersaline wetlands under arid climatic conditions. Top‐down rehydration from these frequent, low intensity wetting events contributes to prevention of carbon starvation and hydraulic failure during drought.
No related grants have been discovered for Hoa Thi Nguyen.