A5065022555- Water resources management and optimization
- Plant Molecular Biology Research
- Plant Reproductive Biology
- Hydrology and Watershed Management Studies
- Cambodian History and Society
- Asian Geopolitics and Ethnography
- Conservation, Biodiversity, and Resource Management
- Transboundary Water Resource Management
- Plant Gene Expression Analysis
- Tree Root and Stability Studies
- Groundwater and Watershed Analysis
- Water-Energy-Food Nexus Studies
- Land Use and Ecosystem Services
- Agriculture, Water, and Health
- Groundwater and Isotope Geochemistry
- Flood Risk Assessment and Management
- Vietnamese History and Culture Studies
- Agricultural Systems and Practices
- Climate change impacts on agriculture
- Fisheries and Aquaculture Studies
- Agricultural Innovations and Practices
- Molecular Biology Techniques and Applications
- Child Nutrition and Water Access
- Rangeland Management and Livestock Ecology
- Environmental Conservation and Management
Cornell University
2010-2023
Palmerston North Hospital
2020-2023
International Water Management Institute
2010-2015
Cold Spring Harbor Laboratory
2009-2015
Myanmar Oxford Clinical Research Unit
2015
University of Amsterdam
2009
University of California, San Diego
2009
Sogang University
2009
Plant & Food Research
2008
Massey University
2004
Abstract One of the most fascinating aspects plant morphology is regular geometric arrangement leaves and flowers, called phyllotaxy. The shoot apical meristem (SAM) determines these patterns, which vary depending on species developmental stage. Auxin acts as an instructive signal in leaf initiation, its transport has been implicated phyllotaxy regulation Arabidopsis (Arabidopsis thaliana). Altered phyllotactic patterns are observed a maize (Zea mays) mutant, aberrant phyllotaxy1 (abph1,...
Abstract Development of multicellular organisms proceeds via the correct interpretation positional information to establish boundaries that separate developmental fields with distinct identities. The maize (Zea mays) leaf is an ideal system study plant morphogenesis as it subdivided into a proximal sheath and distal blade, each patterning. Specialized ligule auricle structures form at blade-sheath boundary. auricles act hinge, allowing blade project angle from stem, while comprises...
Abstract Hydrological modeling is an indispensable component of water resources research and management in large river basins. There a tendency for each new group working basin to develop their own model, resulting plethora such tools major basin. The question then becomes: how much enough? This study reviews hydrological four basins (Nile, Mekong, Ganges Indus). Based on this review, areas action improve effectiveness reduce duplication are suggested. Model setups input data, as well model...
Grass leaves develop from a ring of primordial initial cells within the periphery shoot apical meristem, pool organogenic stem that generates all organs plant shoot. At maturity, grass leaf is flattened, strap-like organ comprising proximal supportive sheath surrounding and distal photosynthetic blade. The blade are partitioned by hinge-like auricle ligule, fringe epidermally derived tissue grows adaxial (top) surface. Together, ligule comprise morphological novelties specific to leaves....
Abstract Phyllotaxy describes the geometric arrangement of leaves and is important for plant productivity. Auxin well known to regulate phyllotactic patterns via PIN1-dependent auxin polar transport, studies maize (Zea mays) aberrant phyllotaxy1 (abph1) mutants suggest importance cytokinin signaling control phyllotaxy. However, whether additional regulators these poorly understood. Here, we report a new dominant mutant, Aberrant phyllotaxy2 (Abph2), in which shoot meristems are enlarged...
Abstract Ecological restoration through exclosure establishment has become an increasingly important approach to reversing degraded ecosystems in rangelands worldwide. The present study was conducted northwestern Ethiopia where policy programs are aiming restore lands. Changes soil properties following establishing exclosures on communal grazing lands were investigated. A space‐for‐time substitution used monitor changes after conversion of with ages ranging from 1 7 years. Significant...
Leaf primordia initiate from the shoot apical meristem with inherent polarity; adaxial side faces meristem, while abaxial away meristem. Adaxial/abaxial polarity is thought to be necessary for laminar growth of leaves, as mutants lacking either or cell types often develop radially symmetric lateral organs. The milkweed pod1 (mwp1) mutant maize (Zea mays) has adaxialized sectors in sheath, proximal part leaf. Ectopic leaf flaps where and juxtapose. expression HD-ZIPIII gene rolled leaf1...
The shoot apical meristem (SAM) orchestrates the balance between stem cell proliferation and organ initiation essential for postembryonic growth. Meristems show a striking diversity in shape size. How this morphological relates to variation plant architecture molecular circuitries driving it are unclear. By generating high-resolution gene expression atlas of vegetative maize apex, we here that distinct sets genes govern regulation identity cells versus Arabidopsis. Cell identities SAM...
From noble beginnings as a prospective forage, polyploid Sorghum halepense ( 'Johnsongrass') is both an invasive species and one of the world's worst agricultural weeds. Formed by S. bicolor x propinquum hybridization, we show to have bicolor-enriched allele composition striking mutations in 5,957 genes that differentiate it from representatives its progenitor outgroup. The spread may been facilitated introgression closely-related cultivated sorghum near genetic loci affecting rhizome...
In Ethiopia, exclosures in landscapes have become increasingly important to improving ecosystem services and reversing biodiversity losses. The present study was conducted Gomit watershed, northern to: (i) investigate the changes vegetation composition, diversity aboveground biomass carbon following establishment of exclosures; (ii) analyse economic returns sequestration assess perception local communities on land degradation exclosures. A space-for-time substitution approach used detect...
The sheathing leaf found in grasses and other monocots is an evolutionary innovation, yet its origin has been a subject of long-standing debate. Here, we revisit the problem light developmental genetics computational modeling. We show that likely arose through WOX-gene-dependent extension primordial zone straddling concentric domains around shoot apex. Patterned growth within this zone, oriented by two polarity fields, accounts for wild-type, mutant mosaic grass development, whereas...
Summary Leaves develop from the shoot apical meristem ( SAM ) via recruitment of leaf founder cells. Unlike eudicots, most monocot leaves display parallel venation and sheathing bases wherein margins overlap stem. Here we utilized computed tomography CT imaging, localization PIN‐FORMED1 (PIN1) auxin transport proteins, in situ hybridization developmental transcripts to analyze ontogeny morphology maize Z ea mays ). imaging whole‐mounted apices illustrates plastochron‐specific stages during...
Summary The formation of developmental boundaries is a common feature multicellular plants and animals, impacts the initiation, structure function all organs. Maize leaves comprise proximal sheath that encloses stem, distal photosynthetic blade projects away from plant axis. An epidermally derived ligule joint‐like auricle develop at blade/sheath boundary maize leaves. Mutations disturbing ligule/auricle region disrupt leaf patterning impact architecture, yet it unclear how this established....
The mechanisms whereby leaf anlagen undergo proliferative growth and expansion to form wide, flat leaves are unclear. maize gene NARROWSHEATH1 (NS1) is a WUSCHEL-related homeobox3 (WOX3) homolog expressed at the margins of primordia, required for mediolateral outgrowth. To investigate NS1 function, we used chromatin immunoprecipitation laser-microdissection RNA-seq primordial identify targets bound modulated by NS1. Microscopic analyses cell division expression in expanding leaves, reverse...
The maize leaf consists of four distinct tissues along its proximodistal axis: sheath, ligule, auricle and blade. liguleless1 (lg1) functions cell autonomously to specify ligule auricle, may propagate a signal that correctly positions the blade-sheath boundary. dominant Wavy in blade (Wab1) mutation disrupts both mediolateral axes leaf. Wab1 blades are narrow ectopic sheath extend into recessive lg1-R exacerbates phenotype; double mutants, most proximal is deleted tissue extends residual We...