scholarly journals Phenotypic Variation in Leaf Morphology of the USDA, ARS Sweetpotato (Ipomoea batatas) Germplasm Collection

HortScience ◽  
2020 ◽  
Vol 55 (4) ◽  
pp. 465-475 ◽  
Author(s):  
D. Michael Jackson ◽  
Howard F. Harrison ◽  
Robert L. Jarret ◽  
Phillip A. Wadl
Keyword(s):  
Ipomoea Batatas ◽  
Agricultural Research ◽  
Germplasm Collection ◽  
Plant Introduction ◽  
Leaf Length ◽  
Leaf Width ◽  
Department Of Agriculture ◽  
Leaf Petiole ◽  
Plant Characteristics ◽  
Agricultural Research Service

During 2012–14, 737 sweetpotato, Ipomoea batatas (L.) Lam. (Convolvulaceae), plant introduction (PI) accessions from the U.S. Department of Agriculture, Agricultural Research Service (USDA, ARS) sweetpotato germplasm collection were evaluated for several phenotypic leaf and plant characteristics, and a photographic record of each accession was made. Data were prepared for placement in the USDA, ARS Germplasm Resources Information Network (GRIN) database and the sweetpotato ontology. The parameters recorded for each genotype were canopy coverage, vine length, general leaf outline, leaf lobing, shape of the central leaf lobe, number of leaf points, leaf petiole length, leaf width, leaf length, leaf width × length, and leaf width/length (aspect ratio). The data indicate that there is wide genetic diversity for vegetative phenotypic characteristics within the USDA, ARS sweetpotato germplasm collection. This study provides important phenotype information for the USDA, ARS sweetpotato collection that has been lacking and can be used for curation of the collection and by researchers and breeders working with this important global food crop.

The Birth, Growth and Future of Systems Approach

2020 ◽  
Vol 31 (3) ◽  
pp. 113-114
Author(s):  
Nelson Laville ◽  
Kenrick Witty ◽  
Ulises Garcia
Keyword(s):  
United States ◽  
Systems Approach ◽  
Agricultural Research ◽  
United States Department ◽  
Department Of Agriculture ◽  
States Department ◽  
Global Team ◽  
Video Link ◽  
Agricultural Research Service ◽  
Research Service

The Beyond Compliance Global team held an interview by video link with Dr Eric Jang, United States Department of Agriculture, Agricultural Research Service (USDA/ARS), now retired. His lab was based in Hawaii, where he continues to reside. Eric was an early advocate and one of the originators of the concepts for Systems Approach.

scholarly journals History of Bermudagrass Turfgrass Breeding Research in Tifton, GA

HortScience ◽  
2018 ◽  
Vol 53 (11) ◽  
pp. 1560-1561 ◽  
Author(s):  
Lisa L. Baxter ◽  
Brian M. Schwartz
Keyword(s):  
Coastal Plain ◽  
Agricultural Research ◽  
Department Of Agriculture ◽  
University Of Georgia ◽  
Breeding Research ◽  
History Of ◽  
The University ◽  
Warm Temperate ◽  
Agricultural Research Service ◽  
The U.S

Bermudagrass (Cynodon spp.) is the foundation of the turfgrass industry in most tropical and warm-temperate regions. Development of bermudagrass as a turfgrass began in the early 1900s. Many of the cultivars commercially available today have been cooperatively released by the U.S. Department of Agriculture Agricultural Research Service (USDA-ARS) and the University of Georgia at the Coastal Plain Experiment Station in Tifton, GA.

scholarly journals Detection and Classification of SPLCV Isolates in the U.S. Sweetpotato Germplasm Collection via a Real-Time PCR Assay and Phylogenetic Analysis

Plant Disease ◽  
2011 ◽  
Vol 95 (11) ◽  
pp. 1385-1391 ◽  
Author(s):  
N. A. Barkley ◽  
D. L. Pinnow ◽  
M. L. Wang ◽  
K. S. Ling ◽  
R. L. Jarret
Keyword(s):  
Phylogenetic Analysis ◽  
Real Time ◽  
Ipomoea Batatas ◽  
Agricultural Research ◽  
Germplasm Collection ◽  
The United States ◽  
United States Department ◽  
Potato Leaf ◽  
In Vitro Plantlets

The United States Department of Agriculture–Agricultural Research Service sweetpotato (Ipomoea batatas) germplasm collection contains accessions that were initially collected from various countries worldwide. These materials have been maintained and distributed as in vitro plantlets since the mid-1980s. The status of viral infection by the emerging Sweet potato leaf curl virus (SPLCV) and other Begomovirus spp. in this germplasm has yet to be determined. In order to minimize the potential distribution of virus-infected clones, all accessions in the collection were tested for SPLCV using a real-time polymerase chain reaction assay. In total, 47 of 701 accessions of in vitro plantlets tested positive for SPLCV. The presence of SPLCV detected in these materials was confirmed via biological indexing using the indicator plants I. nil and I. muricata. Symptoms appeared more rapidly on I. muricata than on I. nil. Nucleotide polymorphisms among the isolates were evaluated by sequencing the AV1 coat protein gene from 24 SPLCV-infected accessions. The results revealed that the SPLCV isolates shared high sequence identity. Ten nucleotide substitutions were identified, most of which were synonymous changes. Phylogenetic analysis was conducted on those 24 SPLCV isolates in combination with six described SPLCV species and various SPLCV strains from GenBank to evaluate the relationships among viral species or strains. The results from this analysis indicated that most of the AV1 genes derived from previously classified SPLCV species clustered together, some of which formed well-supported monophyletic clades, further supporting the current taxonomy. Overall, identification of SPLCV-infected germplasm will allow approaches to be employed to eliminate the virus from the collection and limit the distribution of infected materials.

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