Pecan

Thompson, Tommy E.; Conner, Patrick J.

doi:10.1007/978-1-4419-0763-9_20

Cited by 26 publications

(25 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The genus Carya belongs to the Juglandaceae family, which is characterized by species that associate with both ectomycorrhizal (EM) and arbuscular mycorrhizal (AM) fungi (Wang and Qiu 2006 ; Taber et al 1982 ), except for Juglans nigra , which forms only arbuscular mycorrhizae (Bainard et al 2011 ; Brundrett et al 1990 ; Wang and Qiu 2006 ). Information about the EM fungal assemblages of hickory trees is very limited, and restricted to the pecan hickory ( C. illinoinensis ) (Bonito et al 2011 ; Ge et al 2017 ; Marozzi et al 2017 ), which is economically important to the pecan nut industry (Thompson and Conner 2012 ), but, due to its very low frost resistance, has not been successfully acclimatized in the temperate zone of Europe. The AM fungi of Carya species are even less well documented, although some information about the arbuscular mycorrhizae of pecan roots in natural, semiarid environments has been provided (Taber et al 1982 ).…”

Section: Introductionmentioning

confidence: 99%

Mycorrhizal associations of the exotic hickory trees, Carya laciniosa and Carya cordiformis, grown in Kórnik Arboretum in Poland

et al. 2018

View full text Add to dashboard Cite

We studied mycorrhizal associations of North American Carya laciniosa and Carya cordiformis trees, successfully acclimated to local habitat conditions of the historic Kórnik Arboretum in Poland, in order to better understand mycorrhizal host range extensions in new environments. The root systems of Carya seedlings (1–3 years old), regenerated under a canopy of mature hickory trees, were analyzed using microscopic, morphological, and molecular techniques. Our results, for the first time, indicate that C. laciniosa and C. cordiformis have both arbuscular and ectomycorrhizal associations. In the cleared and stained roots of both Carya species, typical structures of arbuscular mycorrhizae (vesicles, arbuscules, hyphal coils, and intercellular nonseptate hyphae) were detected. On the basis of ITS rDNA sequencing, 40 ectomycorrhizal fungal taxa were revealed, with 25 on C. laciniosa and 19 on C. cordiformis. Only four fungal species (Cenococcum geophilum sensu lato, Russula recondita, Xerocomellus cisalpinus, Humaria hemisphaerica) were shared by both Carya species. The high number of infrequent fungal taxa found, as well as the calculated richness estimator, indicates that the real ectomycorrhizal community of C. laciniosa and C. cordiformis is probably richer. The ability of the exotic Carya species to form arbuscular and ectomycorrhizal linkages with native fungi could be a factor in the successful establishment of these tree species under the conditions of Kórnik Arboretum.Electronic supplementary materialThe online version of this article (10.1007/s00572-018-0846-8) contains supplementary material, which is available to authorized users.

show abstract

Section: Introductionmentioning

confidence: 99%

Mycorrhizal associations of the exotic hickory trees, Carya laciniosa and Carya cordiformis, grown in Kórnik Arboretum in Poland

et al. 2018

View full text Add to dashboard Cite

show abstract

“…produces more pecans than any other state, but other states contribute to the overall production in the USA (Blayney and Gutierrez 2017;USDA 2020). Many abiotic and biotic constraints affect pecan production across this geographical range (Goff et al 1996;Conner and Worley 2000;Wood et al 2003;Thompson and Conner 2012). In the Southeast region, scab (caused by the plant pathogenic fungus Venturia effusa (G. Winter) Rossman & W.C. Allen) is the single most important disease-related constraint (Thompson and Conner 2012).…”

mentioning

confidence: 99%

“…Many abiotic and biotic constraints affect pecan production across this geographical range (Goff et al 1996;Conner and Worley 2000;Wood et al 2003;Thompson and Conner 2012). In the Southeast region, scab (caused by the plant pathogenic fungus Venturia effusa (G. Winter) Rossman & W.C. Allen) is the single most important disease-related constraint (Thompson and Conner 2012). Scab-susceptible pecan cultivars are grown in states in the southeastern region, including Alabama (AL), Arkansas (AR), Florida (FL), GA, IL, Louisiana (LA), Mississippi (MS), Missouri (MO), Oklahoma (OK), Tennessee (TN), and Texas (TX).…”

mentioning

confidence: 99%

Foliage and fruit susceptibility of a pecan provenance collection to scab, caused by Venturia effusa

et al. 2020

Self Cite

View full text Add to dashboard Cite

Background Pecan (Carya illinoinensis) is an important native nut crop in the southern USA. In the Southeast, scab (caused by Venturia effusa) is a major constraint to production, and can result in significant yield losses. The breadth of sources of resistance are poorly defined, and the genetics of resistance has not been established. The aim of this study was to assess the severity of pecan scab on foliage and fruit of the trees in a collection at Georgia, USA, of 875 native pecan genotypes from 93 families in 19 provenances in various states in the USA and Mexico. Methods The scab responses on foliage and fruit on each pecan tree was visually assessed in 2018 and 2019. Both a most severe measure (most severely infected leaf or fruit), and an overall tree rating was taken. Scab severity data were analyzed using a mixed linear model with means separation to explore provenance and family within provenance scab susceptibilities. Results Significant differences in scab susceptibility between provenances and among families within provenances were detected. Trees from provenances in Illinois, Kansas, Kentucky, Missouri, Mississippi, Tennessee and Texas, USA, showed the greatest resistance (based on mean scab severity) for both foliar and fruit scab. Assessments of scab on foliage and fruit gave similar results, as did the values for the most severe scab in the tree and the overall scab severity score. Of the 875 trees assessed, 201 trees had no detectable scab symptoms on foliage or fruit in either year. An additional 116 trees were free of scab symptoms on foliage but did not produce fruit in either year. Those provenances, families within provenances and trees with greatest resistance to scab most often originated from provenance locations with higher rainfall and consequently would be under selection to adapt to scab. Conclusions Identifying populations with most diverse resistance, and those most consistently resistant trees can serve as a resource to develop a better understanding of the scab resistance mechanisms. These natural sources of scab resistance coupled with molecular and genomics tools will contribute to the accelerated development of new pecan cultivars with durable resistance to scab.

show abstract

“…Orchards formed by superior cultivars, propagated by cloning, are more productive and produce higher quality nuts compared to native orchards or those formed by seed propagation. In this way, breeding programs have sought genetic materials with higher yields and nut quality, as well as possessing disease and insect resistance (Thompson & Conner, 2012).…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of Pecan Cultivars to Cladosporium cladosporioides Species Complex

Walker¹,

Muniz²,

Martins³

et al. 2018

Floresta Ambient.

View full text Add to dashboard Cite

Recent studies have observed symptoms of leaf spot in pecan (Carya illinoinensis) associated with species of the Cladosporium cladosporioides complex (C. cladosporioides, C. pseudocladosporioides, and C. subuliforme). Therefore, the present study aimed to investigate the pathogenicity of these Cladosporium spp. isolated from two pecan cultivars. Twenty-six isolates were used to inoculate leaflets of the cultivars, 'Barton' and 'Shawnee' , with a spore suspension. The suspension was applied through drops on the surface of the leaflets, the material was kept in boxes, "gerbox", in the incubation room. After 22 days, leaf spots varied from small circular brown to black stains, which indicated the advancement of the disease. The three Cladosporium sp. were pathogenic to pecan cultivars and there was a difference in susceptibility to C. pseudocladosporioides species between the 'Barton' and 'Shawnee' cultivars, where 'Shawnee' showed greater disease severity.

show abstract

Pecan

Cited by 26 publications

References 39 publications

Mycorrhizal associations of the exotic hickory trees, Carya laciniosa and Carya cordiformis, grown in Kórnik Arboretum in Poland

Mycorrhizal associations of the exotic hickory trees, Carya laciniosa and Carya cordiformis, grown in Kórnik Arboretum in Poland

Foliage and fruit susceptibility of a pecan provenance collection to scab, caused by Venturia effusa

Susceptibility of Pecan Cultivars to Cladosporium cladosporioides Species Complex

Contact Info

Product

Resources

About