A5016087814- Plant responses to water stress
- Plant nutrient uptake and metabolism
- Plant Stress Responses and Tolerance
- Plant Surface Properties and Treatments
- Soil Carbon and Nitrogen Dynamics
- Postharvest Quality and Shelf Life Management
- Legume Nitrogen Fixing Symbiosis
- Plant Micronutrient Interactions and Effects
- Soil and Water Nutrient Dynamics
- Tree Root and Stability Studies
- Mycorrhizal Fungi and Plant Interactions
- Rice Cultivation and Yield Improvement
- Plant Molecular Biology Research
- Photosynthetic Processes and Mechanisms
- Ecology and Vegetation Dynamics Studies
- Plant biochemistry and biosynthesis
- Phytase and its Applications
- Plant Reproductive Biology
- Agronomic Practices and Intercropping Systems
- Aluminum toxicity and tolerance in plants and animals
- Soil Management and Crop Yield
- Plant Diversity and Evolution
- Plant Water Relations and Carbon Dynamics
- Banana Cultivation and Research
- Plant Parasitism and Resistance
The University of Western Australia
2017-2024
University of Guelph
2012-2019
University of Bonn
2008-2016
University of Waterloo
2007-2010
University of Bayreuth
2003-2007
Agriculture and Agri-Food Canada
2007
Western University
2007
Effective regulation of water balance in plants requires localized extracellular barriers that control and solute movement. We describe a clade five Arabidopsis thaliana ABCG half-transporters are required for synthesis an effective suberin barrier roots seed coats (ABCG2, ABCG6, ABCG20) intact pollen wall (ABCG1 ABCG16). Seed abcg2 abcg6 abcg20 triple mutant had increased permeability to tetrazolium red decreased content. The root system was more permeable salts zone complementary affected...
Abstract Aliphatic alcohols naturally exist in many organisms as important cellular components; however, their roles extracellular polymer biosynthesis are poorly defined. We report here the isolation and characterization of a rice (Oryza sativa) male-sterile mutant, defective pollen wall (dpw), which displays anther development degenerated grains with an irregular exine. Chemical analysis revealed that dpw anthers had dramatic reduction cutin monomers altered composition cuticular wax, well...
The major source of nitrogen for rice (Oryza sativa L.) is ammonium (NH4+). NH4+ uptake roots mainly governed by membrane transporters, with OsAMT1;1 being a prominent member the OsAMT1 gene family that known to be involved in transport plants. However, little about its involvement and subsequent effects on assimilation. This study shows constitutively expressed, nitrogen-responsive gene, protein product localized plasma membrane. Its expression level under control circadian rhythm....
Summary Root foraging and root physiology such as exudation of carboxylates into the rhizosphere are important strategies for plant phosphorus (P) acquisition. We used 100 chickpea ( Cicer arietinum ) genotypes with diverse genetic backgrounds to study relative roles morphology in P Plants were grown pots a low‐P sterilized river sand supplied 10 μg g −1 soil Fe PO 4 , poorly soluble form P. There was large genotypic variation (total length, surface area, mean diameter, specific length hair...
Temperatures higher than the optimum negatively affects plant growth and development. Tolerance to high temperature is a complex process that involves several pathways. Understanding this process, especially in crops such as rice, essential prepare for predicted climate changes due global warming. Here, we show OsMYB55 induced by overexpression of resulted improved under decreased negative effect on grain yield. Transcriptome analysis revealed an increase expression genes involved amino...
Rice is an important crop that very sensitive to salinity. However, some varieties differ greatly in this feature, making investigations of salinity tolerance mechanisms possible. The cultivar Pokkali tolerant and known have more extensive hydrophobic barriers its roots than does IR20, a cultivar. These located the root endodermis exodermis prevent direct entry external fluid into stele. it case rice, these are bypassed by most Na+ enters shoot. Exposing plants moderate stress 100 mM NaCl...
Radial oxygen loss (ROL) and root porosity of rice (Oryza sativa L.) plants grown in either aerated or deoxygenated (stagnant) conditions were combined for the first time with extensive histochemical biochemical studies apoplastic barriers roots' peripheral cell layers. Growth stagnant solution significantly affected structural and, consequently, physiological features roots. It increased adventitious by about 20% decreased ROL towards base to zero at a distance 40 mm from apex. By contrast,...
Abstract Soybean (Glycine max L. Merr.) is a versatile and important agronomic crop grown worldwide. Each year millions of dollars potential yield revenues are lost due to root rot disease caused by the oomycete Phytophthora sojae (Kaufmann & Gerdemann). Since primary site infection this organism, we undertook an examination physicochemical barriers in soybean root, namely, suberized walls epidermis endodermis, establish whether or not preformed suberin (i.e. naturally present...
Although it is implied that suberized apoplastic barriers of roots negatively correlate with water and solute permeabilities, direct transport measurements across altered amounts compositions aliphatic suberin are scarce. In the present study, hydroponically grown Arabidopsis wild types (Col8 Col0) different mutants and/or (horst, esb1-1, esb1-2) were used to test this hypothesis. Detailed histochemical studies revealed late development Casparian bands lamellae in horst mutant compared esb...
Barley (Hordeum vulgare) is more drought tolerant than other cereals, thus making it an excellent model for the study of chemical, transcriptomic and physiological effects water deficit. Roots are first organ to sense soil Therefore, we studied response barley seminal roots different potentials induced by polyethylene glycol (PEG) 8000. We investigated changes in anatomical parameters histochemistry microscopy, quantitative qualitative suberin composition analytical chemistry, transcript...
It has been shown that rice roots grown in a stagnant medium develop tight barrier to radial oxygen loss (ROL), whereas aerated do not. This study investigated whether the induction of ROL affects water and solute permeabilities. Growth markedly reduced root growth rate relative conditions. Histochemical studies revealed an early deposition Casparian bands (CBs) suberin lamellae (SL) both endodermis (EN) exodermis, accelerated lignification roots. The absolute amounts suberin, lignin...
Water is the most important prerequisite for life and plays a major role during uptake transport of nutrients. Roots are plant organs that take up part water, from surrounding soil. related to root system architecture, growth, age species dependent complex developmental changes in anatomical structures. The latter mainly attributed deposition suberized barriers certain layers cell walls, such as endo- exodermis. With respect water permeability, suberization roots relevant. or hydraulic...
Summary Suberin is a complex polymer composed of aliphatic and phenolic compounds. It constituent apoplastic plant interfaces. In many species, including rice ( Oryza sativa ), the hypodermis in outer part roots forms suberized cell wall (the Casparian strip and/or suberin lamellae), which inhibits flow water ions protects against pathogens. To date, there no genetic evidence that an transport barrier hypodermis. We discovered reduced culm number1 rcn1 ) mutant could not develop longer than...
Abstract Background Unveiling the diversity of plant strategies to acquire and use phosphorus (P) is crucial understand factors promoting their coexistence in hyperdiverse P-impoverished communities within fire-prone landscapes such as cerrado (South America), fynbos Africa) kwongan (Australia). Scope We explore P-acquisition strategies, highlighting one that has received little attention: acquisition P following fires temporarily enrich soil with P. This strategy expressed by fire...
Apoplastic transport barriers in the roots of rice (Oryza sativa L. cv. IR64) and corn (Zea mays Helix) were isolated enzymatically. Following chemical degradation (monomerization, derivatization), amounts aliphatic aromatic suberin monomers analysed quantitatively by gas chromatography mass spectrometry. In corn, was determined for endodermal (ECW) rhizo-hypodermal (RHCW) cell walls. rice, strong lignification central cylinder (CC), did not allow isolation Similarly, exodermal walls could...
Abstract Wild barley, Hordeum vulgare spp. spontaneum , has a wider genetic diversity than its cultivated progeny, spp . Osmotic stress leads to series of different responses in wild barley seminal roots, ranging from no changes suberization enhanced endodermal certain zones and the formation suberized exodermis, which was not observed modern cultivars studied so far. Further, as response osmotic stress, hydraulic conductivity roots affected but it 2.5‐fold reduced barley. In both...
The relative contribution of the apoplastic and cell‐to‐cell paths to overall hydraulic conductivity outer part rice roots (LpOPR) was estimated using a pressure perfusion technique for 30‐d‐old plants (lowland cultivar, IR64, upland Azucena). based on aerenchyma root segments from two different zones (20–50 mm 50–100 apex) with aerated nutrient solution precise pump rates. (OPR) comprised an outermost rhizodermis, exodermis, sclerenchyma fibre cells, innermost unmodified cortical cell...