| breakdown of host resistance by independent evolutionary lineages of beet necrotic yellow vein virus involves a parallel c/u mutation in its p25 gene. | abstract breakdown of sugar beet rz1-mediated resistance against beet necrotic yellow vein virus (bnyvv) infection was previously found, by reverse genetics, to be caused by a single mutation in its p25 gene. the possibility of alternative breaking mutations, however, has not been discarded. to explore the natural diversity of bnyvv in the field and its effects on overcoming rz1, wild-type (wt) and resistance-breaking (rb) p25 genes from diverse production regions of north america were character ... | 2010 | 20055646 |
| curtovirus-cucurbit interaction: acquisition host plays a role in leafhopper transmission in a host-dependent manner. | curly top disease (ctd) of vegetable crops is caused by viruses in the genus curtovirus (family geminiviridae). cucurbits are reported to be susceptible to ctd; however, the disease is rare in california despite annual outbreaks in other hosts (e.g., common bean, pepper, sugar beet, and tomato). consistent with these observations, no obvious curly top symptoms were observed in melon fields surveyed for ctd in central california in 2004 and 2005, whereas the disease was readily observed in tomato ... | 2009 | 19055441 |
| biological properties and molecular characterization of beet chlorosis virus (bchv). | two distinct viruses belonging to the polerovirus genus, in the family luteoviridae, have been described as being able to induce mild yellowing on sugar beet: beet mild yellowing virus (bmyv) and more recently, beet chlorosis virus (bchv). we have analysed biological properties and molecular organisation of two strains of bchv, one collected in england and the second from california. the biological data suggested that bchv displayed a narrower host range compared to bmyv and beet western yellows ... | 2002 | 12038685 |
| a century of plant virus management in the salinas valley of california, 'east of eden'. | the mild climate of the salinas valley, ca lends itself well to a diverse agricultural industry. however, the diversity of weeds, crops and insect and fungal vectors also provide favorable conditions for plant virus disease development. this paper considers the incidence and management of several plant viruses that have caused serious epidemics and been significant in the agricultural development of the salinas valley during the 20th century. beet curly top virus (bctv) almost destroyed the newl ... | 2000 | 11137170 |
| sequence comparison and classification of beet luteovirus isolates. | three distinct sequence groups were found among partial nucleotide sequences of 38 isolates of beet western yellows virus (bwyv) and beet mild yellowing virus (bmyv) from europe, iran and the usa. the first group contains both sugar beet and oilseed rape specific isolates, and the differentiating characteristic linked to this host range specificity are 2 single base pair changes in a 1,200 nucleotide region of the genome. it is proposed that the european bwyv strains that can be transferred at l ... | 1995 | 8572940 |