A5045404524- Plant Stress Responses and Tolerance
- Plant responses to water stress
- Plant nutrient uptake and metabolism
- Plant responses to elevated CO2
- Plant Water Relations and Carbon Dynamics
- Photosynthetic Processes and Mechanisms
- GABA and Rice Research
- Rice Cultivation and Yield Improvement
- Plant Reproductive Biology
- Soil Carbon and Nitrogen Dynamics
- Research in Cotton Cultivation
- Metabolomics and Mass Spectrometry Studies
- Soil Management and Crop Yield
- Agronomic Practices and Intercropping Systems
- Botanical Research and Chemistry
- Genetic Mapping and Diversity in Plants and Animals
- Soybean genetics and cultivation
- Plant and animal studies
- Tree Root and Stability Studies
- Food composition and properties
- Forest ecology and management
- Botany, Ecology, and Taxonomy Studies
- Plant biochemistry and biosynthesis
- Tree-ring climate responses
- Ecology and Vegetation Dynamics Studies
Macquarie University
2015-2024
The University of Sydney
2015-2017
Commonwealth Scientific and Industrial Research Organisation
1987-1996
University of Florida
1996
University of Tasmania
1996
The University of Western Australia
1980-1990
University of Cambridge
1986
University of Groningen
1980
Oryza meridionalis Ng. is a wild relative of sativa L. found throughout northern Australia where temperatures regularly exceed 35 degrees C in the monsoon growing season. Heat tolerance O. was established by comparing leaf elongation and photosynthetic rates at 45 with plants maintained 27 C. By comparison ssp. japonica cv. Amaroo, heat tolerant. Elongation third declined 47% over 24 h compared 91% decrease for sativa. Net photosynthesis significantly higher whereas two species had same...
A critical component of photosynthetic capacity is the conductance CO(2) from intercellular airspaces to sites fixation in stroma chloroplasts, termed mesophyll (g(m)). Leaf anatomy has been identified as an important determinant g(m). There are few studies temperature response g(m) and none examined implications leaf anatomy. Hence, we compared a cultivar Oryza sativa with two wild relatives endemic hot northern savannah Australia, namely meridionalis australiensis. All three species had...
Climatic variability, typified by erratic heavy-rainfall events, causes waterlogging in intensively irrigated crops and is exacerbated under warm temperature regimes on soils with poor internal drainage. Irrigated cotton often grown precisely these conditions, exposing it to waterlogging-induced yield losses after substantial summer rainfall. This calls for a deeper understanding of mechanisms tolerance its relevance cotton. Hence this review suggests possible loss approaches improvement...
Coleoptiles of rice (Oryza saliva L. ) elongated more rapidly in stagnant solution than water-saturated air: elongation rates aerated were intermediate. Elongation was stimulated between 170% to 390% 17 cultivars screened. On this basis, a relatively submergence-intolerant cultivar and two submergence-tolerant studied further. When seedlings grown range oxygen concentrations imposed by bubbling solutions with gas, germination early coleoptile growth (up 5.0 mm) inhibited at low...
Summary Plant light interception efficiency is a crucial determinant of carbon uptake by individual plants and vegetation. Our aim was to identify whole‐plant variables that summarize complex crown architecture, which can be used predict efficiency. We gathered the largest database digitized date (1831 124 species), estimated measure with detailed three‐dimensional model. Light defined as ratio hemispherically averaged displayed total leaf area. A simple model developed uses only two...
Abstract Bran from bread wheat (Triticum aestivum ‘Babbler’) grain is composed of many outer layers dead maternal tissues that overlie living aleurone cells. The cell function as a barrier resistant to degradation, whereas the layer involved in mobilizing organic substrates endosperm during germination. We microdissected three defined bran fractions, (epidermis and hypodermis), intermediate fraction (cross cells, tube testa, nucellar tissue), inner (aleurone cells), used proteomics identify...
Rice (Oryza sativa L. cv. IR64) was grown in split-root systems to analyze long-distance drought signaling within root systems. This turn underpins how heterogeneous soils adapt drought. The approach compare four tissues: (1) fully watered; (2) droughted and where (3) one-half watered (4) the other half droughted. specifically aimed at identifying tissues altered proteome of adjacent wet roots by hormone signals reciprocally affected dry hydraulically. Quantitative label-free shotgun...
Global mean temperatures are expected to rise by 2-4.5 degrees C 2100, accompanied an increase in frequency and amplitude of extreme temperature events. Greater climatic extremes expanded range cultivation will expose rice increasing stress the future. Understanding gene expression disparate thermal regimes is important for engineering cultivars with tolerance nonoptimal temperatures. Our study investigated proteomic responses cell suspension cultures sudden changes. Cell grown at 28 were...
Summary The mechanistic basis of tolerance to heat stress was investigated in Oryza sativa and two wild rice species, meridionalis australiensis . relatives are endemic the hot, arid Australian savannah. Leaf elongation rates gas exchange were measured during short periods supra‐optimal heat, revealing species differences. Rubisco activase ( RCA ) gene from each sequenced. Using expressed recombinant leaf‐extracted , kinetic properties isoforms studied under high temperatures. undiminished...
Mechanisms of drought tolerance are complex, interacting, and polygenic. This paper describes patterns gene expression at precise physiological stages in 35-day-old seedlings Oryza sativa cv. Nipponbare. Drought was imposed gradually for up to 15 days, causing abscisic acid levels rise growth cease, plants were then re-watered. Proteins identified from leaf samples after moderate drought, extreme 3 6 days re-watering. Label-free quantitative shotgun proteomics resulted identification 1548...
Genes encoding thermostable variants of the photosynthesis heat-labile protein Rubisco activase (Rca) from a wild relative Oryza australiensis were overexpressed in domesticated rice (Oryza sativa). Proteomics was used to quantify abundance O. Rca (Rca-Oa) resulting plants. Plants grown maturity growth rooms and early tillering until immediately prior anthesis, they exposed daytime maximum temperatures 28, 40 45°C constant night 22°C. Non-destructive measurements leaf elongation compare null...
Abstract Background and Aims The leaf economic spectrum (LES) is related to dry mass nutrient investments towards photosynthetic processes structures, the duration of returns on those (leaf lifespan, LL). Phosphorus (P) a key limiting for plant growth, yet it unclear how allocation P among different functions coordinated with LES. We addressed this question 12 evergreen woody species co-occurring P-impoverished soils in south-eastern Australia. Methods Leaf ‘economic’ traits, including LL,...
summary Wheat ( Triticum aestivum L. cv. Eradu) was grown in the field on a deep loamy sand which had either compact soil layer (compact soil) between 10 and 55 cm depth or deep‐tilled profile (loosened soil). Between 33 62 d after sowing, shoots grew more slowly fewer tillers soil. Nitrogen K (but not P) concentrations were 12–14% lower soil, suggesting that nutrient deficiencies might have contributed to impaired shoot growth. Seminal root axes elongated at 0.60 1.78 −1 loosened...
Oxygen deprivation limits the energy available for cellular processes and yet no comprehensive ATP budget has been reported any plant species under O2 deprivation, including Oryza sativa. Using 3-d-old coleoptiles of a cultivar O. sativa tolerant to flooding at germination, (i) rates regeneration in grown normoxia (aerated solution), hypoxia (3% O2), anoxia (N2) (ii) synthesis proteins, lipids, nucleic acids, cell walls, as well K+ transport, were determined. Based on published bioenergetics...
Abstract Global mean surface temperature has been predicted to increase by 1.8–4°C within this century, accompanied an in the magnitude and frequency of extreme events. Developing rice cultivars better adapted non‐optimal temperatures is essential yield future and, hence, understanding molecular response stress necessary. In study, we investigated proteomic responses leaves 24‐day‐old seedlings sudden changes. Rice grown at 28/20°C (day/night) were subjected 3‐day exposure 12/5°C or 20/12°C...
Summary Coleoptiles of rice ( Oryza sativa ) seedlings grown under water commonly elongate by up to 1 mm h −1 reach the atmosphere. We initially analysed this highly specialized phenomenon measuring epidermal cell lengths along coleoptile axis determine elongation rates. This revealed a cohort cells in basal zone that elongated rapidly following emergence from embryo, reaching 200 μm within 12 h. After filming coleoptiles vivo for day, kinematic analysis was applied. Eight time‐sliced...