Relationship Between Climatic Factors and Distribution of Pratylenchus spp. in the Dryland Wheat-Production Areas of Eastern Washington

Kandel, Shyam L.; Smiley, Richard W.; Garland‐Campbell, Kimberly; Elling, Axel A.; Abatzoglou, John T.; Huggins, David R.; Rupp, Richard; Paulitz, T. C.

doi:10.1094/pdis-11-12-1060-re

Cited by 21 publications

(4 citation statements)

References 37 publications

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“…Similarly, Gbadeges in et al, (1993) observed a depressed nematode population in dry season in the savanna areas of Nigeria which later increased in the rainy season and got to the peak between August and October. Negative correlation between temperature and nematode abundance has also been reported (Kandel et al, 2013).These climatic and edaphic factors play important roles in determining the abundance and distribution of nematode species. For instance, several Meloidogyne species are known to attack different crops and tend to favour light soil and warm temperatures (Micheal et al, 2005).Thus, the varied population densities among the six northern states might be due to the differences in rainfall distribution and the characteristic soil types of the states surveyed which are located within the Sudan and Guinea savanna zones of Nigeria.…”

Section: Discussionmentioning

confidence: 86%

“…Occurrence and Distribution of Plant Parasitic Nematodes Associated with Roselle Arcent survey on collection and evaluation of roselle germplasm in Nigeria has shown Kaduna and Jigawa as parts of the four states with the highest roselle accessions, suggesting areas of greatest diversity of genetic resources in Nigeria (Dauduet al, 2015). Such high crop intensity have been reported to result into increased nematode density (Kandel et al,2013) which might be responsible for the higher nematode population observed in Jigawa than Kano state. Highest nematode population was observed in Katsina state with lowest from Kaduna.…”

Section: Discussionmentioning

confidence: 99%

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Occurrence and population distribution of plant parasitic nematodes associated with roselle (Hibiscus sabdariffa L.) in northern Nigeria

Ogunsola¹,

Ogunfunmilayo²,

Solomon³

et al. 2018

Agro-Sci.

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Pests including nematodes have been reported as a limiting factor to the production of roselle worldwide.A survey of rosellefarmsinsix Northern Sates of Nigeria was conductedin 2013 to identify the diverse nematode species associated with the soils and roots of the plant and determine their population densities on farmers' fields.Eightsoil and ten plant samples were randomly collected from each of twenty farms from which nematodes were extracted and identified. Four genera of plantparasitic nematodes (Meloidogyne spp.,Helicotylenchus spp., Rotylenchulus spp.and Tylenchus spp.) were found in association with roots and rhizosphere of roselle plants. Meloidogyne were most populous (62.29%) on the roots while Tylenchuswas least (1.68%). Helicotylenchus spp appeared in highest density (50.05%) in plant rhizosphere, but not identified from the roots. The highest percentage of nematode population (22.7 %) wasfrom Katsina, followed by Sokoto (21.6%), Jigawa (17.4%), Zamfara (16.5%), Kano (15.1%) and Kaduna states (6.7%).The generally low nematode density observed might be due to low precipitation and high soil temperature of the six states.Occurrence of varied species of nematodes demands effective control measures for improved roselle productivity. Kano, Zamfara and Jigawawith low nematode population densities can be considered for further research towards the establishment of pest-free areas or area of low pest prevalence for roselle nematodes in Nigeria, useful in the agricultural export trade. Further studies are required on the determination of density economic threshold and the definitive roles of nematodes in causing low productivity of roselle.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Occurrence and population distribution of plant parasitic nematodes associated with roselle (Hibiscus sabdariffa L.) in northern Nigeria

Ogunsola¹,

Ogunfunmilayo²,

Solomon³

et al. 2018

Agro-Sci.

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“…Prepared carrot disks were inoculated with a single nematode, and kept in a dark growth cabinet (Percival Scientific) at 22° for at least 2 months prior to extraction in water. Nematodes were collected from a 2010 survey of dryland wheat fields in eastern WA ( Kandel et al 2013 ), and maintained in water until carrot disk inoculation. Pratylenchus inoculum for each species was quantified using a nematode counting slide (Chalex Corporation) with 1.5 ml aliquots, and species-specific primers developed by Yan et al (2008) were used to identify P. neglectus or P. thornei .…”

Section: Methodsmentioning

confidence: 99%

Resistance to Multiple Soil-Borne Pathogens of the Pacific Northwest, USA Is Colocated in a Wheat Recombinant Inbred Line Population

Thompson

Mahoney

Smiley

et al. 2017

G3 Genes|Genomes|Genetics

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Soil-borne pathogens of the Pacific Northwest decrease yields in both spring and winter wheat. Pathogens of economic importance include Fusarium culmorum, Pratylenchus neglectus, P. thornei, and Rhizoctonia solani AG8. Few options are available to growers to manage these pathogens and reduce yield loss, therefore the focus for breeding programs is on developing resistant wheat cultivars. A recombinant inbred line population, LouAu (MP-7, NSL 511036), was developed to identify quantitative trait loci (QTL) associated with resistance to P. neglectus and P. thornei. This same population was later suspected to be resistant to F. culmorum and R. solani AG8. This study confirms partial resistance to F. culmorum and R. solani AG8 is present in this population. Six major and 16 speculative QTL were identified across seven measured traits. Four of the six major QTL were found within the same genomic region of the 5A wheat chromosome suggesting shared gene(s) contribute to the resistance. These QTL will be useful in breeding programs looking to incorporate resistance to soil-borne pathogens in wheat cultivars.

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“…As the nematode trophic groups are interconnected via complex ecological network of plant, soil and environment, understanding the impact of different functional groups on crop production under changing global climate is necessary to achieve sustainability in crop production. Among the multitude of climate change factors, increase in atmospheric CO 2 , temperature variability, alteration of precipitation level and pattern, and climatic extremes maybe contemplated as the dominant drivers for shifting community composition of the PPNs ( Colagiero and Ciancio, 2012 ; Kandel et al., 2013 ; Mueller et al., 2016 ). In the following paragraphs we will discuss the consequences of global climate change on the plant feeding nematodes.…”

Section: Nematodes As Ecosystem Drivers In the Climate Change Continuummentioning

confidence: 99%

The pervasive impact of global climate change on plant-nematode interaction continuum

Rao

Phani

2023

Front. Plant Sci.

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Pest profiles in today’s global food production system are continually affected by climate change and extreme weather. Under varying climatic conditions, plant-parasitic nematodes (PPNs) cause substantial economic damage to a wide variety of agricultural and horticultural commodities. In parallel, their herbivory also accredit to diverse ecosystem services such as nutrient cycling, allocation and turnover of plant biomass, shaping of vegetation community, and alteration of rhizospheric microorganism consortium by modifying the root exudation pattern. Thus PPNs, together with the vast majority of free-living nematodes, act as ecological drivers. Because of direct exposure to the open environment, PPN biology and physiology are largely governed by environmental factors including temperature, precipitation, humidity, atmospheric and soil carbon dioxide level, and weather extremes. The negative effects of climate change such as global warming, elevated CO2, altered precipitation and the weather extremes including heat waves, droughts, floods, wildfires and storms greatly influence the biogeographic range, distribution, abundance, survival, fitness, reproduction, and parasitic potential of the PPNs. Changes in these biological and ecological parameters associated to the PPNs exert huge impact on agriculture. Yet, depending on how adaptable the species are according to their geo-spatial distribution, the consequences of climate change include both positive and negative effects on the PPN communities. While assorting the effects of climate change as a whole, it can be estimated that the changing environmental factors, on one hand, will aggravate the PPN damage by aiding to abundance, distribution, reproduction, generation, plant growth and reduced plant defense, but the phenomena like sex reversal, entering cryptobiosis, and reduced survival should act in counter direction. This seemingly creates a contraposition effect, where assessing any confluent trend is difficult. However, as the climate change effects will differ according to space and time it is apprehensible that the PPNs will react and adapt according to their location and species specificity. Nevertheless, the bio-ecological shifts in the PPNs will necessitate tweaking their management practices from the agri-horticultural perspective. In this regard, we must aim for a ‘climate-smart’ package that will take care of the food production, pest prevention and environment protection. Integrated nematode management involving precise monitoring and modeling-based studies of population dynamics in relation to climatic fluctuations with escalated reliance on biocontrol, host resistance, and other safer approaches like crop rotation, crop scheduling, cover cropping, biofumigation, use of farmyard manure (FYM) would surely prove to be viable options. Although the novel nematicidal molecules are target-specific and relatively less harmful to the environment, their application should not be promoted following the global aim to reduce pesticide usage in future agriculture. Thus, having a reliable risk assessment with scenario planning, the adaptive management strategies must be designed to cope with the impending situation and satisfy the farmers’ need.

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Relationship Between Climatic Factors and Distribution of Pratylenchus spp. in the Dryland Wheat-Production Areas of Eastern Washington

Abstract: Kandel, S. L., Smiley, R.

Cited by 21 publications

References 37 publications

Occurrence and population distribution of plant parasitic nematodes associated with roselle (<i>Hibiscus sabdariffa</i> L.) in northern Nigeria

Occurrence and population distribution of plant parasitic nematodes associated with roselle (<i>Hibiscus sabdariffa</i> L.) in northern Nigeria

Resistance to Multiple Soil-Borne Pathogens of the Pacific Northwest, USA Is Colocated in a Wheat Recombinant Inbred Line Population

The pervasive impact of global climate change on plant-nematode interaction continuum

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