Comparison of Six Geographic Sources of Loblolly Pine for Fusiform Rust Resistance

1980 ◽  
Vol 70 (12) ◽  
pp. 1141 ◽  
Author(s):  
H. R. Powers, Jr.
Keyword(s):  
Loblolly Pine ◽  
Rust Resistance ◽  
Fusiform Rust ◽  
Geographic Sources

Monoterpene composition and fusiform rust resistance in slash and loblolly pines

1995 ◽  
Vol 25 (2) ◽  
pp. 193-197 ◽  
Author(s):  
M. Michelozzi ◽  
T.L. White ◽  
A.E. Squillace ◽  
W.J. Lowe
Keyword(s):  
Loblolly Pine ◽  
Rust Resistance ◽  
Slash Pine ◽  
Cortical Tissue ◽  
Fusiform Rust ◽  
Breeding Values ◽  
Loblolly Pines ◽  
Monoterpene Composition

Monoterpene composition of cortical tissue was analyzed in slash pine (Pinuselliottii Engelm. var. elliottii) and loblolly pine (Pinustaeda L.) clones with known breeding values for fusiform rust resistance. Trees having a relatively high content of β-phellandrene tend to be more resistant than trees with a low β-phellandrene content. Such results confirm previous data and suggest the utilization of β-phellandrene content as an aid in selecting relatively rust resistant slash and loblolly pines.

Indirect selection and clonal propagation of loblolly pine seedlings enhance resistance to fusiform rust

1989 ◽  
Vol 19 (4) ◽  
pp. 534-537 ◽  
Author(s):  
G. S. Foster ◽  
R. L. Anderson
Keyword(s):  
Loblolly Pine ◽  
Rust Resistance ◽  
Clonal Propagation ◽  
Indirect Selection ◽  
Artificial Inoculation ◽  
Fusiform Rust ◽  
Rooted Cutting ◽  
Pine Seedlings ◽  
Susceptible Control ◽  
High Degree

A population of loblolly pine (Pinustaeda L.) seedlings without fusiform rust (Cronartiumquercuum (Berk.) Miyabe ex Shirai f.sp. fusiforme) galls was developed by controlled-cross matings of parent trees with known rust resistance, and subsequent screening of the seedling offspring through artificial inoculation. The seedlings without rust galls then entered a vegetative propagation system using rooted cuttings. A second round of rust testing by artificial inoculation, using a random sample of 20 clones from the program, revealed a high degree of rust resistance (4% galled) compared with that of seedlings from either a resistant control seedlot (50% galled) or a susceptible control seedlot (81% galled). This apparently high degree of rust resistance may be due to genetic effects, rooted cutting morphology, or both.

scholarly journals NLR Diversity and Candidate Fusiform Rust Resistance Genes in Loblolly Pine

2021 ◽  
Author(s):  
Daniel Ence ◽  
Katherine E Smith ◽  
Shenghua Fan ◽  
Leandro Gomide Neves ◽  
Robin Paul ◽  
...  
Keyword(s):  
Gene Family ◽  
Resistance Gene ◽  
Loblolly Pine ◽  
Resistance Genes ◽  
Rust Resistance ◽  
De Novo ◽  
Gene Diversity ◽  
Gene Family Evolution ◽  
Fusiform Rust ◽  
Geographic Diversity

Abstract Resistance to fusiform rust disease in loblolly pine (Pinus taeda) is a classic gene-for-gene system. Early resistance gene mapping in the P. taeda family 10-5 identified RAPD markers for a major fusiform rust resistance gene, Fr1. More recently SNP markers associated with resistance were mapped to a full-length gene model in the loblolly pine genome encoding for an NLR protein. NLR genes are one of the most abundant gene families in plant genomes and are involved in effector-triggered immunity. Inter- and intraspecies studies of NLR gene diversity and expression have resulted in improved disease resistance. To characterize NLR gene diversity and discover potential resistance genes, we assembled de novo transcriptomes from 92 loblolly genotypes from across the natural range of the species. In these transcriptomes, we identified novel NLR transcripts that are not present in the loblolly pine reference genome and found significant geographic diversity of NLR genes providing evidence of gene family-evolution. We designed capture probes for these NLRs to identify and map SNPs that stably cosegregate with resistance to the SC20-21 isolate of Cronartium quercuum f.sp. fusiforme (Cqf) in half-sib progeny of the 10-5 family. We identified ten SNPs and two QTL associated with resistance to SC20-21 Cqf. The geographic diversity of NLR genes provides evidence of NLR gene family-evolution in loblolly pine. The SNPs associated with rust resistance provide a resource to enhance breeding and deployment of resistant pine seedlings.

Marker associations for fusiform rust resistance in a clonal population of loblolly pine (Pinus taeda, L.)

2020 ◽  
Vol 16 (6) ◽  
Author(s):  
W. Patrick Cumbie ◽  
Dudley A. Huber ◽  
Victor C. Steel ◽  
William Rottmann ◽  
Christina Cannistra ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Rust Resistance ◽  
Fusiform Rust ◽  
Clonal Population ◽  
Pinus Taeda L

scholarly journals Mapping Fusiform Rust Resistance Genes within a Complex Mating Design of Loblolly Pine

Forests ◽  
2014 ◽  
Vol 5 (2) ◽  
pp. 347-362 ◽  
Author(s):  
Tania Quesada ◽  
Marcio Resende Jr. ◽  
Patricio Muñoz ◽  
Jill Wegrzyn ◽  
David Neale ◽  
...  
Keyword(s):  
Loblolly Pine ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Fusiform Rust ◽  
Mating Design ◽  
Rust Resistance Genes

Stability of Rust Infection Ratios for Resistant and Susceptible Slash and Loblolly Pine Across Rust Hazard Levels

1993 ◽  
Vol 17 (4) ◽  
pp. 188-192 ◽  
Author(s):  
G. R. Hodge ◽  
T. L. White ◽  
R. A. Schmidt ◽  
J. E. Allen
Keyword(s):  
Loblolly Pine ◽  
Rust Resistance ◽  
Economic Benefits ◽  
Slash Pine ◽  
Fusiform Rust ◽  
Breeding Values ◽  
Rust Infection ◽  
Genetically Improved ◽  
Hazard Levels ◽  
Forest Managers

Abstract Fusiform rust resistant and susceptible loblolly and slash pine (bulk mixes of six parents each) were planted at six locations. The ratio of resistant-to-susceptible seedlot infection in both species was stable across all levels of rust hazard across all locations. In other words, the percentage of infected trees in the resistant seedlot was essentially a constant fraction of the percent infection in the susceptible seedlot. The resistant-to-susceptible seedlot infection ratio was 0.225 for loblolly pine and 0.371 for slash pine. For slash pine, predicted breeding values for rust resistance were used to make an accurate prediction of this ratio. The pattern of constant proportional resistance of particular seedlots can be used by forest managers to make planting decisions and assess economic benefits of planting genetically improved material. The results suggest that resistant stock planted at any location will have less fusiform rust infection than would unimproved stock. South. J. Appl. For. 17(4):188-192.

Fusiform Rust Resistance of Select Loblolly Pine Seedlots in the Laboratory, Nursery, and Field

1983 ◽  
Vol 7 (4) ◽  
pp. 198-203 ◽  
Author(s):  
Deborah L. Skoller ◽  
Floyd E. Bridgewater ◽  
Clements C. Lambeth
Keyword(s):  
Loblolly Pine ◽  
Rust Resistance ◽  
Field Tests ◽  
Field Testing ◽  
Field Resistance ◽  
Fusiform Rust ◽  
One Year ◽  
Old Trees ◽  
Term Field

Abstract Twenty-three seedlots exhibited consistency in relative resistance to fusiform rust whether testing was in the Resistance Screening Center, nursery, or in long-term field tests. Results indicate that family screening for rust resistance can be conducted on one-year-old trees at less cost, and perhaps more accurately, than that of long-term field testing. In a nursery where some seedlings were left unprotected from infection while others were chemically protected, both lots were culled to produce rust-free seedlings for field planting. After four years both protected and unprotected trees had the same level of infection. As nursery screening of moderately infected trees does not significantly increase field resistance of the remaining noninfected trees, we suggest that nursery seedlings be chemically protected.

An Integrated Approach Toward Reducing Losses from Fusiform Rust in Merchantable Slash and Loblolly Pine Plantations

2000 ◽  
Author(s):  
Roger P. Belanger ◽  
Thomas Miller ◽  
Stanley J. Zarnoch ◽  
Stephen W. Fraedrich ◽  
John F. Godbee
Keyword(s):  
Loblolly Pine ◽  
Integrated Approach ◽  
Pine Plantations ◽  
Fusiform Rust
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