John Humphries

ORCID: 0000-0003-0731-7556
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About
Contact & Profiles
Research Areas
  • Polysaccharides and Plant Cell Walls
  • Plant Molecular Biology Research
  • Plant Reproductive Biology
  • Diverse Musicological Studies
  • Research in Cotton Cultivation
  • Music History and Culture
  • Plant-Microbe Interactions and Immunity
  • Plant Gene Expression Analysis
  • Space exploration and regulation
  • Spacecraft Design and Technology
  • Microbial Metabolites in Food Biotechnology
  • Photosynthetic Processes and Mechanisms
  • Spacecraft and Cryogenic Technologies
  • Plant biochemistry and biosynthesis
  • Spacecraft Dynamics and Control
  • Plant Pathogens and Fungal Diseases
  • Mechanical and Thermal Properties Analysis
  • Aerospace Engineering and Control Systems
  • Thermography and Photoacoustic Techniques
  • Rocket and propulsion systems research
  • Textile materials and evaluations
  • Design Education and Practice
  • Open Education and E-Learning
  • Food composition and properties
  • Plant and animal studies

La Trobe University
2020-2025

AgriBio
2024-2025

Agriculture and Food
2020-2025

The University of Melbourne
2013-2022

University of South Alabama
2020-2021

Australian Research Council
2013

University of California, San Diego
2009-2012

The University of Adelaide
2005

United States Air Force Academy
1997

Polarization of cell division is essential for eukaryotic development, but little known about how this accomplished in plants. The formation stomatal complexes maize involves the polarization asymmetric subsidiary mother (SMC) divisions toward adjacent guard (GMC), apparently under influence a GMC-derived signal. We found that pan1 gene promotes premitotic SMCs and encodes leucine-rich repeat receptor-like protein becomes localized at sites GMC contact. PAN1 has an inactive kinase domain...

10.1126/science.1161686 article EN Science 2009-01-29

Plant Rho family GTPases (ROPs) have been investigated primarily for their functions in polarized cell growth. We previously showed that the maize (Zea mays) Leu-rich repeat receptor-like protein PANGLOSS1 (PAN1) promotes polarization of asymmetric subsidiary mother (SMC) divisions during stomatal development. Here, we show Type I ROPs 2 and 9 function together with PAN1 this process. Partial loss ROP2/9 causes a weak SMC division polarity phenotype strongly enhances pan1 mutants. Like PAN1,...

10.1105/tpc.111.085597 article EN cc-by The Plant Cell 2011-06-01

Mechanisms governing the polarization of plant cell division are poorly understood. Previously, we identified pangloss1 (PAN1) as a leucine-rich repeat–receptor-like kinase (LRR-RLK) that promotes subsidiary mother (SMC) divisions toward adjacent guard (GMC) during stomatal development in maize (Zea mays). Here, identify pangloss2 (PAN2) second LRR-RLK promoting SMC polarization. Quantitative proteomic analysis PAN2 candidate by its depletion from membranes pan2 single and pan1;pan2 double...

10.1105/tpc.112.104125 article EN The Plant Cell 2012-11-01

The predominant Fascilin 1 (FAS1)-containing proteins in plants belong to the Fasciclin-Like Arabinogalactan-protein (FLA) family of extracellular glycoproteins. In addition FAS1 domains, these multi-domain FLA contain glycomotif regions predicted direct large arabinogalactan (AG) glycans and many signal sequences for a glycosylphosphatidylinositol (GPI)-anchor tether them plasma membrane. FLAs are proposed play both structural signaling functions by forming range interactions plant matrix,...

10.3389/fpls.2020.615392 article EN cc-by Frontiers in Plant Science 2020-12-10

The plant cell wall plays a critical role in signaling responses to environmental and developmental cues, acting as both the sensing interface regulator of integrity. Wall-associated kinases (WAKs) are receptor-like located at wall-plasma membrane-cytoplasmic implicated integrity sensing. WAKs Arabidopsis thaliana have been shown bind pectins different forms under various conditions, such oligogalacturonides (OG)s stress response, native pectin during expansion. mechanism(s) use for grasses,...

10.3390/cells9112478 article EN cc-by Cells 2020-11-14

Flavonoids are ubiquitous polyphenolic compounds in plants, long recognised for their health-promoting properties humans. Methylated flavonoids have received increasing attention due to the potential of methylation enhance medicinal efficacy. Recently, Eucalyptus species with high levels O-methylated flavanone pinostrobin been identified. Pinostrobin has commercial value its numerous pharmacological and functional food benefits. Little is known about identity or mode action enzymes involved...

10.3390/ijms23063190 article EN International Journal of Molecular Sciences 2022-03-16

Abstract Oat (Avena sativa) is a cereal crop whose grains are rich in (1,3;1,4)-β-D-glucan (mixed-linkage glucan or MLG), soluble dietary fiber. In our study, we analyzed oat endosperm development 2 Canadian varieties with differing MLG content and nutritional value. We confirmed that undergoes nuclear type of but shorter cellularization phase than barley (Hordeum vulgare). Callose cellulose were the first polysaccharides to be detected early anticlinal cell walls at 11 days postemergence...

10.1093/plphys/kiad566 article EN cc-by PLANT PHYSIOLOGY 2023-10-20

Arabinogalactan-proteins (AGPs) are members of the hydroxyproline-rich glycoprotein (HRGP) superfamily, a group highly diverse proteoglycans that present in cell wall, plasma membrane as well secretions almost all plants, with important roles many developmental processes. The role GALT8 (At1g22015), Glycosyltransferase-31 (GT31) family member Carbohydrate-Active Enzyme database (CAZy), was examined by biochemical characterization and phenotypic analysis galt8 mutant line. To characterize its...

10.3389/fpls.2021.678564 article EN cc-by Frontiers in Plant Science 2021-05-25

Research on terpene biosynthesis in the genus Eucalyptus (Myrtaceae) is poorly developed, but recently large numbers of synthase (TPS) genes have been identified. Few these characterized or their expression localized to specific tissues. A prime candidate for detailed examination TPS gene bisexual eucalypt flower-composed male and female reproductive organs, vegetative tissues that may express different genes. We aimed characterize compare profile expressed anthers gynoecia high oil-yielding...

10.1093/treephys/tpaa161 article EN Tree Physiology 2020-11-18

10.1177/0040571x3603219009 article Theology 1936-04-01

The major heat sources for satellites above the atmosphere are (1) sun, (2) sunlight reflected from earth and (3) long‐wave radiation earth. In addition, there is sometimes production of by internal sources. For a satellite travelling atmosphere, energy it receives primarily transferred radiation, infra‐red visible. Therefore, equilibrium temperature determined properties satellite's skin, that is, its characteristics (emissivity albedo). When dealing with variable input heat, then thermal...

10.1108/eb032762 article EN Aircraft Engineering and Aerospace Technology 1956-11-01

This paper documents a major success of integrated test and evaluation (IT&E) in the Air Force. The B-IB fleet was suffering from flare strike problem that limited training operations. Computational fluid dynamics, requiring sophisticated modeling methods, carefully designed flight techniques were used to resolve restore full operational status. also outlines final recommendations made Combat Command examines lessons learned this analysis program.

10.2514/6.1997-2963 article EN 33rd Joint Propulsion Conference and Exhibit 1997-07-06
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