A5055605937- Plant nutrient uptake and metabolism
- Legume Nitrogen Fixing Symbiosis
- Soil Carbon and Nitrogen Dynamics
- Aluminum toxicity and tolerance in plants and animals
- Plant Micronutrient Interactions and Effects
- Potato Plant Research
- Plant Pathogens and Resistance
- Crop Yield and Soil Fertility
- Agriculture, Plant Science, Crop Management
- Plant Stress Responses and Tolerance
- Nematode management and characterization studies
- Photosynthetic Processes and Mechanisms
- Clay minerals and soil interactions
- Phosphorus and nutrient management
- Agricultural Science and Fertilization
- Soil and Water Nutrient Dynamics
- Polymer-Based Agricultural Enhancements
- Botanical Research and Chemistry
- Growth and nutrition in plants
- Fish Ecology and Management Studies
- Geology and Paleoclimatology Research
- Aquatic Invertebrate Ecology and Behavior
- Parathyroid Disorders and Treatments
- Phytase and its Applications
- Plant Growth Enhancement Techniques
The University of Western Australia
2006-2015
Netherlands Institute for Radio Astronomy
2013
Japan International Research Center for Agricultural Sciences
2008-2009
Summary Proteaceae species in south‐western Australia occur on severely phosphorus (P)‐impoverished soils. They have very low leaf P concentrations, but relatively fast rates of photosynthesis, thus exhibiting extremely high photosynthetic phosphorus‐use‐efficiency ( PPUE ). Although the mechanisms underpinning their remain unknown, one possibility is that these may be able to replace phospholipids with nonphospholipids during development, without compromising photosynthesis. For six...
Summary 1. The classical model of long‐term ecosystem development suggests that primary productivity is limited by nitrogen (N) on young substrates and phosphorus (P) older substrates. Measurements foliar soil nutrients along chronosequences support this model, but direct tests through nutrient‐addition experiments are rare. 2. We conducted a nutrient‐limitation bioassay using phytometer species grown in soils from five stages >2‐million‐year dune chronosequence south‐western Australia....
• The relationship between carboxylate release from roots and the ability of species to utilize phosphorus sparingly soluble forms was studied by comparing Triticum aestivum, Brassica napus, Cicer arietinum, Pisum sativum, Lupinus albus, angustifolius cosentinii. Plants were grown in sand supplied with 40 mg P kg−1 AlPO4, FePO4 or Ca5OH(PO4)3, as KH2PO4; control plants received no P. differed species. sativum C. arietinum did not access AlPO4 despite releasing carboxylates into rhizosphere....
Nitrification results in poor nitrogen (N) recovery and negative environmental impacts most agricultural systems. Some plant species release secondary metabolites from their roots that inhibit nitrification, a phenomenon known as biological nitrification inhibition (BNI). Here, we attempt to characterize BNI sorghum (Sorghum bicolor). In solution culture, the effect of N nutrition age was studied on activity roots. A bioluminescence assay using recombinant Nitrosomonas europaea employed...
Summary In Brazil, the campos rupestres occur over Brazilian shield, and are characterized by acidic nutrient‐impoverished soils, which particularly low in phosphorus (P). Despite recognition of as a global biodiversity hotspot, little is known about diversity P‐acquisition strategies other aspects plant mineral nutrition this region. To explore nutrient‐acquisition assess P nutrition, we measured leaf nitrogen (N) concentrations, root morphology determined percentage arbuscular mycorrhizal...
Proteaceae species in south-western Australia occur on phosphorus- (P) impoverished soils. Their leaves contain very low P levels, but have relatively high rates of photosynthesis. We measured ribosomal RNA (rRNA) abundance, soluble protein, activities several enzymes and glucose 6-phosphate (Glc6P) levels expanding mature six their natural habitat. The results were compared with those for Arabidopsis thaliana. Compared A. thaliana, immature contained rRNA, especially plastidic rRNA. showed...
South-western Australia harbours a global biodiversity hotspot on the world's most phosphorus (P)-impoverished soils. The greatest occurs severely nutrient-impoverished soils, where non-mycorrhizal species are prominent component of flora. Mycorrhizal dominate soils contain slightly more phosphorus. In addition to habitat loss and dryland salinity, major threat plant in this region is eutrophication due enrichment with P. Many south-western Australian extremely sensitive P, low capability...
Previous research has suggested a trade-off between the capacity of plants to downregulate their phosphorus (P) uptake and efficiency P resorption from senescent leaves in species P-impoverished environments. To investigate this further, four Australian native (Banksia attenuata, B. menziesii, Acacia truncata A. xanthina) were grown greenhouse nutrient solutions at range concentrations [P]. received 0 500 µm P; Banksia 10 P, avoid major P-toxicity symptoms these highly P-sensitive species....
• The relationship between carboxylate release and the ability of plants to access phosphorus from AlPO4 detoxify aluminium was studied by comparing species with a low high rate release, Triticum aestivum (wheat) Lupinus albus (white lupin), respectively. Species were supplied P at 10, 20, 40 or 100 mg kg−1 sand in form sparingly soluble KH2PO4; control did not receive any P. significantly better than L. accessing AlPO4, despite accumulating fewer carboxylates its rhizosphere. Rhizosphere pH...
Abstract The tropical pasture grass Brachiaria humidiola (Rendle) Schweick releases nitrification inhibitory compounds from its roots, a phenomenon termed 'biological inhibition' (BNI). We investigated the influence of root exudates B. humidicola on nitrification, major soil microorganisms and plant growth promoting using two contrasting types, Andosol Cambisol. addition (containing BNI activity that is expressed in Allylthiourea unit (ATU) was standardized bioassay against synthetic...
Some Lupinus species produce cluster roots in response to low plant phosphorus (P) status. The cause of variation cluster-root formation among cluster-root-forming is unknown. aim this study was investigate if is, part, dependent on different relative growth rates (RGRs) when they show similar shoot P status.Three species, L. albus, pilosus and atlanticus, were grown washed river sand at 0, 7·5, 15 or 40 mg kg(-1) dry sand. Plants harvested 34, 42 62 d after sowing, fresh weight leaves,...
Summary Environmental monitoring is becoming increasingly sophisticated with the widespread adoption of data loggers, sensor arrays and remote sensing, leading to larger scale, higher resolution superior quality data. However, interpreting deciding when how apply environmental management remains a subjective underdeveloped area research. Control charts, developed in industrial settings identify manufacturing processes were beyond acceptable bounds production quality, represent one solution....
The Australian legume species Viminaria juncea forms both cluster roots and mycorrhizal associations. aim of this study was to identify if these root specializations are expressed at differential supplies phosphorus (P) different shoot P concentrations [P]. Seedlings were planted in sand provided with a inoculum basal nutrients plus one 21 treatments, ranging from 0 50 mg kg−1 dry soil. Plants harvested after 12 weeks, roots, shoots measured for length fresh weight. number the percentage...
Summary Uren & Parsons ( ) criticize our nutrient addition experiment and question the integrity of Jurien Bay dune chronosequence. Their primary criticisms relate to (i) inconsistencies in parent material along chronosequence (ii) lack consideration micronutrients glasshouse experiment. We reaffirm that Quindalup–Spearwood succession is a consistent Holocene–Middle (possibly Early) Pleistocene soil which material, topography, present‐day climate vegetation type (i.e. Mediterranean...
Seven Lupinus albus L. landraces were selected, based on their geographic origin and the soil type pH at site of collection seeds, compared with cv. Kiev mutant. We hypothesised that those collected from red/yellow acidic sands (pH 5–5.7) would be better acquiring P FePO4 or AlPO4 than selected brown neutral 7) fine, calcareous, alkaline 9), fine calcareous more effective Ca5OH(PO4)3. Plants grown in sand supplied 40 mg P/kg as above sparingly soluble forms, KH2PO4; control plants received...
PREMISE OF THE STUDY: Cluster‐root (CR) formation is a desirable trait to improve phosphorus (P) acquisition as global P resources are dwindling. CRs in some lupine species suppressed at higher status. Whether increased growth rate enhances CR due “dilution” of leaf concentration unknown. We investigated interactive effects status and relative (RGR) on two Lupinus species, which differ their biomass investment. Variation RGR was imposed by varying day length. METHODS: albus L. pilosus were...