Reniform nematode (Rotylenchulus reniformis) and its interactions with cotton (Gossypium hirsutum).

2021 ◽  
pp. 94-99
Author(s):  
Kathy S. Lawrence
Keyword(s):  
Gossypium Hirsutum ◽  
Integrated Management ◽  
Economic Factor ◽  
The United States ◽  
Future Research ◽  
Reniform Nematode ◽  
Rotylenchulus Reniformis ◽  
The Usa ◽  
Management Optimization ◽  
Cotton Belt

Abstract The reniform nematode, Rotylenchulus reniformis, is a major economic factor limiting cotton (Gossypium hirsutum) production in the USA. Across the United States cotton belt, 0.1-5.0% of the cotton crop is lost to the reniform nematode (RN) annually. This chapter discusses the economic importance, geographical distribution, host range, damage symptoms, biology and life cycle, interactions with other nematodes and pathogens, recommended integrated management, and management optimization of the reniform nematode (R. reniformis). Future research requirements are also mentioned.

scholarly journals Cotton (Gossypium hirsutum) Cultivars Exhibiting Tolerance to the Reniform Nematode (Rotylenchulus reniformis)

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Julie A. Blessitt ◽  
Salliana R. Stetina ◽  
Ted P. Wallace ◽  
Peggy T. Smith ◽  
Gabriel L. Sciumbato
Keyword(s):  
Gossypium Hirsutum ◽  
Field Study ◽  
Sandy Loam ◽  
Economic Losses ◽  
Reniform Nematode ◽  
Rotylenchulus Reniformis ◽  
Cotton Variety ◽  
Variety Trials ◽  
The Usa ◽  
Extension Center

A field study was conducted over a two-year period (2006-2007) at the Delta Research and Extension Center, Stoneville, MS, USA to screen selected entries in the 2006 Mississippi Cotton Variety Trials for tolerance to the reniform nematode (Rotylenchulus reniformis). Trials were conducted in nonirrigated fields with primarily sandy loam soils. Though some variability was noted between test locations and years, six of 13 cotton (Gossypium hirsutum) cultivars tested were considered tolerant to the reniform nematode: “Cropland Genetics 3520 B2RF,” “DynaGrow 2520 B2RF,” “Stoneville 5242 BR,” “Stoneville 5599 BR,” “Deltapine 488 BG/RR,” and “Fibermax 960 B2R.” Of these, the first three exhibited yields similar to the productive cultivar “Deltapine 445 BG/RR” in all environments. Though they will not suppress the reniform nematode population, these cultivars can help reduce economic losses attributed to this pathogen in the Midsouth region of the USA.

scholarly journals The Elusive Search for Reniform Nematode Resistance in Cotton

2018 ◽  
Vol 108 (5) ◽  
pp. 532-541 ◽  
Author(s):  
Churamani Khanal ◽  
Edward C. McGawley ◽  
Charles Overstreet ◽  
Salliana R. Stetina
Keyword(s):  
Upland Cotton ◽  
Marker Assisted Selection ◽  
Nematode Resistance ◽  
The United States ◽  
Molecular Techniques ◽  
Future Research ◽  
Reniform Nematode ◽  
Research Activity ◽  
Breeding Lines ◽  
Cotton Belt

The reniform nematode (Rotylenchulus reniformis Linford and Oliveira) has emerged as the most important plant-parasitic nematode of cotton in the United States cotton belt. Success in the development of reniform nematode-resistant upland cotton cultivars (Gossypium hirsutum L.) has not been realized despite over three decades of breeding efforts. Research approaches ranging from conventional breeding to triple species hybrids to marker-assisted selection have been employed to introgress reniform nematode resistance from other species of cotton into upland cultivars. Reniform nematode-resistant breeding lines derived from G. longicalyx were developed in 2007. However, these breeding lines displayed stunting symptoms and a hypersensitive response to reniform nematode infection. Subsequent breeding efforts focused on G. barbadense, G. aridum, G. armoreanum, and other species that have a high level of resistance to reniform nematode. Marker-assisted selection has greatly improved screening of reniform nematode-resistant lines. The use of advanced molecular techniques such as CRISPER-Cas9 systems and alternative ways such as delivery of suitable “cry” proteins and specific double-stranded RNA to nematodes will assist in developing resistant cultivars of cotton. In spite of the efforts of cotton breeders and nematologists, successes are limited only to the development of reniform nematode-resistant breeding lines. In this article, we provide an overview of the approaches employed to develop reniform nematode-resistant upland cotton cultivars in the past, progress to date, major obstacles, and some promising future research activity.

scholarly journals Quantitative Trait Loci Associated with Rotylenchulus reniformis Host Suitability in Soybean

2020 ◽  
Vol 110 (9) ◽  
pp. 1511-1521
Author(s):  
Juliet Wilkes ◽  
Christopher Saski ◽  
Mariola Klepadlo ◽  
Benjamin Fallen ◽  
Paula Agudelo
Keyword(s):  
Quantitative Trait Loci ◽  
Qtl Analysis ◽  
Quantitative Trait ◽  
The United States ◽  
Host Suitability ◽  
Reniform Nematode ◽  
Rotylenchulus Reniformis ◽  
Chromosome 18 ◽  
Nematode Reproduction ◽  
Trait Loci

Reniform nematode (Rotylenchulus reniformis) is a yield-limiting pathogen of soybean (Glycine max) in the southeastern region of the United States. A population of 250 recombinant inbred lines (RIL) (F2:8) developed from a cross between reniform nematode resistant soybean cultivar Forrest and susceptible cultivar Williams 82 was utilized to identify regions associated with host suitability. A genetic linkage map was constructed using single-nucleotide polymorphism markers generated by genotyping-by-sequencing. The phenotype was measured in the RIL population and resistance was characterized using normalized and transformed nematode reproduction indices in an optimal univariate cluster analysis. Quantitative trait loci (QTL) analysis using normalized phenotype scores identified two QTLs on each arm of chromosome 18 (rrn-1 and rrn-2). The same QTL analysis performed with log10(x) transformed phenotype data also identified two QTLs: one on chromosome 18 overlapping the same region in the other analysis (rrn-1), and one on chromosome 11 (rrn-3). While rrn-1 and rrn-3 have been reported associated with reduced reproduction of reniform nematode, this is the first report of the rrn-2 region associated with host suitability to reniform nematode. The resistant parent allele at rrn-2 showed an inverse relationship with the resistance phenotype, correlating with an increase in nematode reproduction or host suitability. Several candidate genes within these regions corresponded with host plant defense systems. Interestingly, a characteristic pathogen resistance gene with a leucine-rich repeat was discovered within rrn-2. These genetic markers can be used by soybean breeders in marker-assisted selection to develop lines with resistance to reniform nematode.

Cultural Diversity and Trust in IT Adoption

2008 ◽  
pp. 3048-3061
Author(s):  
David Gefen ◽  
Gregory M. Rose ◽  
Merrill Warkentin ◽  
Paul A. Pavlou
Keyword(s):  
Cultural Diversity ◽  
The United States ◽  
Perceived Usefulness ◽  
Electronic Voting ◽  
Future Research ◽  
It Adoption ◽  
Cultural Changes ◽  
The Usa ◽  
The Republic ◽  
The Individual

To trust means to have expectations about others’ (the trustees’) socially acceptable behavior. One of the central effects of this trust in the context of IT adoption is to increase the perceived usefulness (PU) of Information Technology (IT) associated with the trustee’s agency. One way of increasing this trust is through greater sociocultural similarity. Taking previous research into the realm of electronic voting, this paper posits that because trust is culture-dependent, it should decrease considerably as cultural diversity and differentiation increases. To investigate the role of trust in IT adoption in different cultures where dissimilar concepts of socially acceptable behavior exist, this study compares trust-related perceptions of an emerging IT (i.e., electronic voting) between the United States of America (USA) and the Republic of South Africa (RSA). More specifically, the question was addressed by comparing the unique circumstances of the cultural changes in the RSA with the more socially integrated mainstream USA culture. In both cultures, a perceived sociocultural similarity between the individual and the agency in charge of the electronic voting IT contributed to both the establishment of trust and to an increase in the perceived usefulness of the IT, supporting and extending the extrapolations of past propositions to this new realm. However, only in the USA did trust contribute to the PU of the IT. The results suggest that when cultural diversity is large, trust becomes of lesser importance, perhaps because it can no longer reduce social uncertainty. Implications for researchers and governmental voting agencies are discussed, and future research directions are proposed.

The beet cyst nematode (Heterodera schachtii): an ancient threat to sugar beet crops in Central Europe has become an invisible actor.

2021 ◽  
pp. 394-399
Author(s):  
Matthias Daub
Keyword(s):  
Sugar Beet ◽  
Integrated Management ◽  
Nematode Species ◽  
Cyst Nematode ◽  
Heterodera Schachtii ◽  
Future Research ◽  
Parasitic Nematodes ◽  
Beet Cyst Nematode ◽  
Management Optimization ◽  
Damage Symptoms

Abstract The beet cyst nematode (BCN) was one of the first discovered plant parasitic nematodes. Heterodera schachtii was observed in 1859 in Halle in Central Germany by the botanist Herman Schacht and described later by Adolf Schmidt in 1871, who named this cyst nematode species after its original discoverer. Partly due to the lack of knowledge about the effect of sugar beet monocultures on the population build-up of BCN, this nematode had a devastating impact on sugar production in 1876 that led to the shutdown of 24 sugar factories in Germany. This chapter discusses the economic importance, distribution, host range, damage symptoms, biology and life cycle, interactions with other nematodes and pathogens, recommended integrated management, and management optimization of H. schachtii. Future research requirements and future developments are also mentioned.

Improving the management of plant parasitic nematodes in banana: integration of technologies and responding to the demand of the consumers and markets.

2021 ◽  
pp. 159-166
Author(s):  
Luis Ernesto Pocasangre Enamorado
Keyword(s):  
Life Cycle ◽  
Integrated Management ◽  
Economic Importance ◽  
Future Research ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Future Developments ◽  
Management Optimization ◽  
Damage Symptoms ◽  
Plant Parasitic

Abstract This chapter discusses the economic importance, geographical distribution, host range, damage symptoms, biology and life cycle, interactions with other nematodes and pathogens, recommended integrated management, and management optimization of Radopholus similis infesting bananas. Future research requirements and future developments are also mentioned.

Mitigating a galling problem in California's carrot production.

2021 ◽  
pp. 284-289
Author(s):  
J. Ole Becker
Keyword(s):  
Life Cycle ◽  
Host Range ◽  
Geographical Distribution ◽  
Meloidogyne Incognita ◽  
Integrated Management ◽  
Economic Importance ◽  
Future Research ◽  
Future Developments ◽  
Management Optimization ◽  
Damage Symptoms

Abstract This chapter discusses the economic importance, geographical distribution, host range, damage symptoms, biology and life cycle, interactions with other nematodes and pathogens, recommended integrated management, and management optimization of Meloidogyne incognita infesting carrots in California, USA. Future research requirements and future developments are also mentioned.

The shifting sands of banana nematode communities under mixed cropping conditions.

2021 ◽  
pp. 167-173
Author(s):  
Danny Coyne
Keyword(s):  
Integrated Management ◽  
Economic Importance ◽  
Future Research ◽  
Parasitic Nematodes ◽  
Mixed Cropping ◽  
Plant Parasitic Nematodes ◽  
Future Developments ◽  
Management Optimization ◽  
Damage Symptoms ◽  
Plant Parasitic

Abstract This chapter discusses the economic importance, geographical distribution, host range, damage symptoms, biology and life cycle, interactions with other nematodes and pathogens, recommended integrated management, and management optimization of plant parasitic nematodes infesting bananas. Future research requirements and future developments are also mentioned.

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