A5021798737- Plant Molecular Biology Research
- Plant Parasitism and Resistance
- Plant Reproductive Biology
- Legume Nitrogen Fixing Symbiosis
- Plant and animal studies
- Genetic and Environmental Crop Studies
- Plant nutrient uptake and metabolism
- Soybean genetics and cultivation
- Plant Physiology and Cultivation Studies
- Agronomic Practices and Intercropping Systems
- Plant tissue culture and regeneration
- Flowering Plant Growth and Cultivation
- Plant Pathogens and Fungal Diseases
- Genetic Mapping and Diversity in Plants and Animals
- Plant Stress Responses and Tolerance
- Greenhouse Technology and Climate Control
- Ecology and Vegetation Dynamics Studies
- Photosynthetic Processes and Mechanisms
- Horticultural and Viticultural Research
- Plant Gene Expression Analysis
- Nematode management and characterization studies
- Plant Pathogens and Resistance
- Allelopathy and phytotoxic interactions
- Cocoa and Sweet Potato Agronomy
- Plant-Microbe Interactions and Immunity
Minnesota State University, Mankato
2025
The University of Queensland
2015-2024
Agriculture and Food
2015-2024
Australian Research Council
2003-2024
ARC Centre of Excellence for Plant Success in Nature and Agriculture
2020-2024
Queens University
2021
Agricultural Research Organization
2012
Ghent University
2012
Bar-Ilan University
2012
VIB-UGent Center for Plant Systems Biology
2012
Shoot branching is inhibited by auxin transported down the stem from shoot apex. Auxin does not accumulate in buds and so must act indirectly. We show that mutations MAX4 gene of Arabidopsis result increased auxin-resistant bud growth. Increased max4 shoots restored to wild type grafting wild-type rootstocks, suggesting required produce a mobile branch-inhibiting signal, acting downstream auxin. A similar role has been proposed for pea gene, RMS1 . Accordingly, were found encode orthologous,...
Significance It is commonly accepted that the plant hormone auxin mediates apical dominance. However, we have discovered dominance strongly correlates with sugar availability and not apically supplied auxin. We revealed predominantly controlled by shoot tip’s intense demand for sugars, which limits to axillary buds. These findings overturn a long-standing hypothesis on encourage us reevaluate relationship between hormones sugars in this other aspects of development.
Smoke is an important abiotic cue for plant regeneration in postfire landscapes. Karrikins are a class of compounds discovered smoke that promote seed germination and influence early development many plants by unknown mechanism. A genetic screen karrikin-insensitive mutants Arabidopsis thaliana revealed karrikin signaling requires the F-box protein MAX2, which also mediates responses to structurally-related strigolactone family phytohormones. synthetic GR24 trigger similar effects on...
Cytokinin (CK) has long been implicated as a promoter of bud outgrowth in plants, but exactly how this is achieved coordination with other plant hormones unclear. The recent discovery strigolactones (SLs) the long-sought branch-inhibiting hormone allowed us to test CK and SL coordinately regulate pea (Pisum sativum). We found that SL-deficient plants are more sensitive stimulation growth by low concentrations locally applied than wild-type plants. Furthermore, contrast mutant buds almost...
In Arabidopsis (Arabidopsis thaliana), the carotenoid cleavage dioxygenases MORE AXILLARY GROWTH3 (MAX3) and MAX4 act together with MAX1 to produce a strigolactone signaling molecule required for inhibition of axillary bud outgrowth. We show that both MAX3 transcripts are positively auxin regulated in manner similar orthologous genes from pea (Pisum sativum) rice (Oryza sativa), supporting evolutionary conservation this regulation plants. This is important branching control because large...
Abstract During the last century, two key hypotheses have been proposed to explain apical dominance in plants: auxin promotes production of a second messenger that moves up into buds repress their outgrowth, and saturation stem inhibits transport from buds, thereby inhibiting bud outgrowth. The recent discovery strigolactone as novel shoot-branching inhibitor allowed us test its mode action relation these hypotheses. We found exogenously applied inhibited outgrowth pea (Pisum sativum) even...
Long distance cell-to-cell communication is critical for the development of multicellular organisms. In this respect, plants are especially demanding as they constantly integrate environmental inputs to adjust growth processes different conditions. One example thickening shoots and roots, also designated secondary growth. Secondary mediated by vascular cambium, a stem cell-like tissue whose cell-proliferating activity regulated over long plant hormone auxin. How auxin signaling integrated at...
Abstract Many processes have been described in the control of shoot branching. Apical dominance is defined as exerted by tip on outgrowth axillary buds, whereas correlative inhibition includes suppression growth other growing buds or shoots. The level, signaling, and/or flow plant hormone auxin stems and thought to be involved these processes. In addition, RAMOSUS (RMS) branching genes pea (Pisum sativum) synthesis perception a long-distance inhibitory signal produced stem roots,...
Abstract Physiological and genetic studies with the ramosus (rms) mutants in garden pea (Pisum sativum) more axillary shoots (max) Arabidopsis (Arabidopsis thaliana) have shown that shoot branching is regulated by a network of long-distance signals. Orthologous genes RMS1 MAX4 control synthesis novel graft-transmissible signal may be carotenoid derivative acts as inhibitor. In this study, we demonstrate further conservation system showing MAX2 MAX3 are orthologous to RMS4 RMS5, respectively....
Adventitious root formation is essential for the propagation of many commercially important plant species and involves roots from nonroot tissues such as stems or leaves. Here, we demonstrate that hormone strigolactone suppresses adventitious in Arabidopsis (Arabidopsis thaliana) pea (Pisum sativum). Strigolactone-deficient response mutants both have enhanced rooting. CYCLIN B1 expression, an early marker initiation primordia Arabidopsis, more axillary growth2 (max2), a mutant, suggesting...
Significance Strigolactone hormones regulate many plant growth and developmental processes are particularly important in regulating response to nonoptimal conditions. Plants produce a range of bioactive strigolactone-like compounds, suggesting that the biosynthesis pathway is complex. Despite this complexity, only one type enzyme, MORE AXILLARY GROWTH1 (MAX1) cytochrome P450, has been attributed diversity strigolactones. Using transcriptomics reverse genetics, we discovered previously...
Strigolactones (SLs) are plant hormones that suppress lateral shoot branching, and act to regulate root hair elongation formation. Here, we show SLs regulators of perception or response low inorganic phosphate (Pi) conditions. This regulation is mediated by MORE AXILLARY GROWTH2 (MAX2) correlated with transcriptional induction the auxin receptor TRANSPORT INHIBITOR RESPONSE1 (TIR1). Mutants SL signaling (max2-1) biosynthesis (max4-1) showed reduced Pi conditions relative wild type. In...
Abstract Strigolactones (SLs) are carotenoid-derived plant hormones that regulate shoot branching, secondary growth, root development, and responses to soil phosphate. In Arabidopsis (Arabidopsis thaliana), SL biosynthesis requires the sequential action of two carotenoid cleavage dioxygenases, MORE AXILLARY GROWTH3 (MAX3) MAX4, followed by a cytochrome P450, MAX1. rice (Oryza sativa), plastid-localized protein DWARF27 (OsD27) is also necessary for biosynthesis, but equivalent gene in has not...
Abstract The inhibition of shoot branching by the growing tip plants, termed apical dominance, was originally thought to be mediated auxin. Recently, importance sink strength during dominance has re-emerged with recent studies highlighting roles for sugars in promoting branching. This raises many unanswered questions on relative auxin and dominance. Here we show that depletion after decapitation is not always initial trigger rapid cytokinin (CK) increases buds are instead correlated enhanced...
In Pisum sativum, the RAMOSUS genes RMS1, RMS2, and RMS5 regulate shoot branching via physiologically defined mobile signals. RMS1 is most likely a carotenoid cleavage enzyme acts with to control levels of an as yet unidentified inhibitor required for auxin inhibition branching. Our work provides molecular, genetic, physiological evidence that plays central role in shoot-to-root-to-shoot feedback system regulates pea. Indole-3-acetic acid (IAA) positively transcript level, potentially...
Apical dominance is the term used to describe control of shoot tip over axillary bud outgrowth (e.g. [Cline, 1997][1]). It best demonstrated via removal (decapitation), which leads apical dominance. Indeed, decapitation has been widely study outgrowth. In contrast
Abstract The fifth increased branching ramosus(rms) mutant, rms5, from pea (Pisum sativum), is described here for phenotype and grafting responses with four other rms mutants. Xylem sap zeatin riboside concentration shoot auxin levels inrms5 plants have also been compared withrms1 wild type (WT). Rms1 andRms5 appear to act closely at the biochemical or cellular level control branching, because was inhibited in reciprocal epicotyl grafts between rms5 orrms1 WT plants, but not rms1 seedlings....
Trehalose 6-phosphate (Tre6P) is a signal of sucrose availability in plants, and has been implicated the regulation shoot branching by abnormal phenotypes Arabidopsis (Arabidopsis thaliana) maize (Zea mays) mutants with altered Tre6P metabolism. Decapitation garden pea (Pisum sativum) plants proposed to release dormancy axillary buds lower down stem due changes supply, we hypothesized that this response mediated Tre6P. led rapid sustained rise levels buds, coinciding onset bud outgrowth....