Jim H. Lorenzen

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Microsatellites, or simple sequence repeats (SSRs) are very useful molecular markers for a number of plant species. They are commonly used in cultivar identification, plant variety protection, as anchor markers in genetic mapping, and in marker-assisted breeding. Early development of SSRs was hampered by the high cost of library screening and clone(More)
Potato virus Y (PVY) is a serious potato pathogen that affects potato seed and commercial production crops. In recent decades, novel PVY strains have been described that cause necrotic symptoms on tobacco foliage and/or potato tubers. The major PVY strains that affect potato include PVYO and PVYN, which have distinct serotypes that can be differentiated by(More)
Potato virus Y (PVY) is one of the most economically important plant pathogens. The PVY genome has a high degree of genetic variability and is also subject to recombination. New recombinants have been reported in many countries since the 1980s, but the origin of these recombinant strains and the physical and evolutionary mechanisms driving their emergence(More)
This report describes the characterization by whole-genome sequencing of four PVY isolates with unique combinations of molecular and symptomatic characteristics. Three of these four isolates were of type PVYN:O (ID-1, OR-1, PN10A), including one of “type B”, which contains an extra recombination event in the 5′UTR/P1 cistron; the other (NE-11) represents a(More)
James Legg & Eklou Attiogbevi Somado & Ian Barker & Larry Beach & Hernan Ceballos & Willmer Cuellar & Warid Elkhoury & Dan Gerling & Jan Helsen & Clair Hershey & Andy Jarvis & Peter Kulakow & Lava Kumar & Jim Lorenzen & John Lynam & Matthew McMahon & Gowda Maruthi & Doug Miano & Kiddo Mtunda & Pheneas Natwuruhunga & Emmanuel Okogbenin & Phemba Pezo & Eugene(More)
Banana Xanthomonas wilt (BXW), caused by the bacterium Xanthomonas campestris pv. musacearum (Xcm), is the most devastating disease of banana in east and central Africa. The spread of BXW threatens the livelihood of millions of African farmers who depend on banana for food security and income. There are no commercial chemicals, biocontrol agents or(More)
Corky ringspot disease (CRS) resistance is an ideal target trait for breeding using marker-assisted selection (MAS) due to the high variability in field disease incidence that complicates screening for resistance. To develop molecular marker(s) associated with CRS resistance, a linkage map was constructed for a tetraploid population of 92 genotypes in order(More)
All East African Highland Banana varieties are genetically uniform having arisen from a single clone introduced to Africa. East African Highland bananas (EAHBs) are a subgroup of triploid (AAA genome) bananas of importance to food security in the Great Lakes region of Africa. Little is known about their genetic variation, population structure and(More)
NorValley is a multi-purpose, high-yielding, whiteskinned cultivar suitable for processing into chips, dehydrated flakes, or for table stock use. It chips directly from long-term storage at 6 C without reconditioning. NorValley has wide adaptability and is suitable for production on irrigated or non-irrigated land and has a low incidence of hollow heart.(More)
Nematodes cause substantial grain yield loss in susceptible maize (Zea mays L.) cultivars. This study was conducted to estimate general combining ability (GCA), specific combining ability (SCA) and genetic effects associated with nematode resistance in maize. The 30 F 1 hybrids generated from a 6 × 6 diallel and two local checks were evaluated in 2009 at(More)