A5040359852- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Photosynthetic Processes and Mechanisms
- earthquake and tectonic studies
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Plant Stress Responses and Tolerance
- Seismology and Earthquake Studies
- Plant nutrient uptake and metabolism
- Seismic Imaging and Inversion Techniques
- Light effects on plants
- Geological and Geochemical Analysis
- Leaf Properties and Growth Measurement
- Plant and animal studies
- Crop Yield and Soil Fertility
- Atmospheric chemistry and aerosols
- Neonatal Respiratory Health Research
- Wheat and Barley Genetics and Pathology
- Ecology and Vegetation Dynamics Studies
- Plant responses to water stress
- Soil Carbon and Nitrogen Dynamics
- Ion Transport and Channel Regulation
- Climate change impacts on agriculture
- Remote Sensing in Agriculture
- Congenital Diaphragmatic Hernia Studies
ARC Centre of Excellence for Transformative Meta-Optical Systems
2017-2024
Australian National University
2015-2024
Cardiff University
2024
Australian Research Council
2010-2023
Oklahoma State University
2014-2022
University of Michigan
2021
University of California, Riverside
2020
Frederick National Laboratory for Cancer Research
2019
Leidos (United States)
2019
Data Management Services (United States)
2019
Abstract Changes in specific leaf area (SLA, projected per unit dry mass) and nitrogen partitioning between proteins within leaves occur during the acclimation of plants to their growth irradiance. In this paper, relative importance both these changes maximizing carbon gain is quantified. Photosynthesis, SLA was determined from 10 dicotyledonous C 3 species grown photon irradiances 200 1000 µ mol m −2 s −1 . Photosynthetic rate measured under irradiance was, on average, three times higher...
Wheat (Triticum aestivum L. cv Yecora 70) plants were grown with various concentrations of nitrate nitrogen available to the roots. Sampling flag leaves began after they had reached full expansion and continued throughout senescence. Rates gas exchange, ribulose-1,5-bisphosphate (RuP(2)) carboxylase activity, amounts chlorophyll, soluble protein, nitrogen, phosphorus determined for each leaf. Rate CO(2) assimilation was uniquely related total leaf irrespective nutrient treatment, season,...
Conventional gas-exchange techniques that measure the stomatal conductance and rate of CO2 assimilation leaves were combined with measurements carbon isotope composition in air passing over a leaf. Isotopic discrimination during uptake was determined from difference entering leaving leaf chamber. measured short term correlated strongly combusted material. Environmental conditions manipulated to alter relative influences carboxylation on isotopes by intact leaves. With C3 plants, increased as...
The leaf economics spectrum (LES) represents a suite of intercorrelated traits concerning construction costs per unit area, nutrient concentrations, and rates carbon fixation tissue turnover. Although broad trade-offs among structural physiological have been demonstrated, we still do not comprehensive view the fundamental constraints underlying LES trade-offs. Here, investigated mechanisms underpinning by analysing novel data compilation incorporating rarely considered such as dry mass...
The CO2 transfer conductance in leaves quantifies the ease with which can diffuse from sub-stomatal cavities to sites of carboxylation within chloroplast. aim this work was test hypothesis that is proportional surface area chloroplasts exposed intercellular airspaces. We compared two genotypes, wild-type and transgenic tobacco, had been transformed an antisense gene directed at mRNA Rubisco small subunit. Transgenic tobacco lower rates assimilation than but similar chlorophyll contents. Leaf...
Measurements of CO2 and water vapour exchange by leaves were combined with measurements carbon isotope composition (13C/12C) in the air passing over leaf. Carbon discrimination during uptake was determined from difference leaving leaf chamber or without a enclosed. Leaves wheat plants grown different nitrogen nutrition several other species examined. The measurements, made at irradiances for given leaf, showed that strongly correlated rate assimilation as well ratio intercellular to ambient...
CO2 reaches Rubisco by diffusion down a concentration gradient. The gradient forms during photosynthesis as result of restrictions to free movement imposed stomata and leaf anatomy. Recent techniques have enabled the internal conductance, gi, leaves, that is, from sub-stomatal cavities sites carboxylation, be measured (1). A strong correlation has been found between gi rate assimilation under high irradiance ambient partial pressure, Ca (2,3,4). Unfortunately, title paper Lloyd et al. (3),...
Leaf dark respiration (Rdark ) is an important yet poorly quantified component of the global carbon cycle. Given this, we analyzed a new database Rdark and associated leaf traits. Data for 899 species were compiled from 100 sites (from Arctic to tropics). Several woody nonwoody plant functional types (PFTs) represented. Mixed-effects models used disentangle sources variation in . Area-based at prevailing average daily growth temperature (T) each site increased only twofold tropics, despite...
The temperature responses of mesophyll conductance (gm ) were investigated for nine species using carbon isotope techniques combining tunable diode laser spectroscopy and gas exchange measurements. Species included the evergreen trees Eucalyptus pauciflora Quercus engelmannii; tropical tree Lophostemon confertus; as well herbaceous Nicotiana tabacum, Oryza sativa, Triticum aestivum, Gossypium hirsutum, Glycine max Arabidopsis thaliana. Responses varied from a two- to threefold increase in...
The partial pressure of CO2 at the sites carboxylation within chloroplasts depends on conductance to diffusion from intercellular airspace carboxylation, termed mesophyll (gm ). We investigated temperature response gm in tobacco (Nicotiana tabacum) by combining gas exchange high light, ambient either 2 or 21% O2 with carbon isotope measurements using tuneable diode laser spectroscopy. increased linearly . In , discrimination associated decreased 5.0 ± 0.2 1.8 0.2‰ as 15 40 °C, but...
Improving photosynthesis to raise wheat yield potential has emerged as a major target for physiologists. Photosynthesis-related traits, such nitrogen per unit leaf area (Narea) and dry mass (LMA), require laborious, destructive, laboratory-based methods, while physiological traits underpinning photosynthetic capacity, maximum Rubisco activity normalized 25 °C (Vcmax25) electron transport rate (J), time-consuming gas exchange measurements. The aim of this study was assess whether...
Abstract We introduce the AusTraits database - a compilation of values plant traits for taxa in Australian flora (hereafter AusTraits). synthesises data on 448 across 28,640 from field campaigns, published literature, taxonomic monographs, and individual taxon descriptions. Traits vary scope physiological measures performance (e.g. photosynthetic gas exchange, water-use efficiency) to morphological attributes leaf area, seed mass, height) which link aspects ecological variation. contains...
Net photosynthetic CO2 assimilation rate (An) decreases at leaf temperatures above a relatively mild optimum (Topt) in most higher plants. This decline is often attributed to reduced conductance, increased loss from photorespiration and respiration, chloroplast electron transport (J), or deactivation of Ribulose-1,5-bisphosphate Carboxylase Oxygenase (Rubisco). However, it unclear which these factors can best predict species independent declines An high temperature. We show that species, on...
Effects of Light and Nitrogen Nutrition on the Organization Photosynthetic Apparatus in Spinach Get access Ichiro Terashima, Terashima 1Plant Environmental Biology Group, Research School Biological Sciences, The Australian National UniversityP. O. Box 475, Canberra, A.C.T. 2601, Australia Search for other works by this author on: Oxford Academic Google Scholar John R. Evans 2Division Plant Industry CSIROP. 1600, Cell Physiology, Volume 29, Issue 1, January 1988, Pages 143–155,...