| GROWTH | Plant Height, final | Plant height of a typical plant in centimeters from the ground to tip at maturity. | 78 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| GROWTH | Flower height | Height measured in centimeters from the ground to the first flower | 90 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| GROWTH | Growth habit | General growth habit of the accession | T - T = Tall | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Node Number to First Flower | A count from the second trifid bract as one, up to and including the first flowering node when 50% of the plants in a planting are flowering. Expressed as an average of five randomly chosen plants (in integers). | 26 | 7 | PEA.CORE.FROM.CHINA | W6 44773 2012o SD | Not Available |
| MORPHOLOGY | Flower Color | Flower color | P - Pigmented | 7 | PEA.CORE.FROM.CHINA | W6 44773 2012o SD | Not Available |
| MORPHOLOGY | Flower Color | Flower color | P - Pigmented | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Flowers per Peduncle | Maximum number of flowers per peduncle. | 1 | 7 | PEA.CORE.FROM.CHINA | W6 44773 2012o SD | Not Available |
| MORPHOLOGY | Flowers per Peduncle | Maximum number of flowers per peduncle. | 1 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pod Length | Average length of pods from first reproductive node of five different plants at full pod stage recorded in centimeters. Expressed to one decimal place. | 6.1 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pod Color | Pod color, taken at first reproductive node at full pod stage. | G - Green | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pod Shape | Pod shape measured at flat pod stage. | S - Straight | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pod Apex | Pod apex measured at flat pod stage. | B - Blunt | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Seeds per Pod | Fully develops on first reproductive node. Average number of seeds from five longest pods, each from five different plants. Expressed to one decimal place. | 4.8 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Leaflet Morphology | Leaflet morphology | N - Normal | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Stipules | Stipules | N - Normal | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Stem Fasciation | Stem fasciation | N - No | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Seed weight 100 | Weight of 100 seeds in grams. | 25 | | PEA.SEEDWEIGHT.WRPIS | W6 44773 2014i SD | Not Available |
| MORPHOLOGY | Pod Wall Neoplasia | Pod wall Neoplasia | no - No pod wall neoplasia | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pod shatter | Notes whether pods shatter prior to harvest of accession. | - - N | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pods per peduncle | Number of pods per peduncle if the same number occurs on several plants in the accession. | 1 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Pods per plant | Number of pods per plant averaged | 2 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Peducle length | Peduncle length in millimeters | 23 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Peducle length | Peduncle length in millimeters | 5 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| MORPHOLOGY | Stipule base has colored ring | Base of the stipule has a colored ring, often redish or purplish red | N - No colored rings around the base of the stipule | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| PHENOLOGY | Days to flower | Number of days from sowing seed to first observed flower | 70 | 32 | PEA.2018.SHOUSE | W6 44773 2017i SD | Not Available |
| SUBSET | Chinese Pisum Core | A flag to indicate the accession is part of the core subset from China | Y - Yes, The accessions is part of the core subset from China | | PEA.CORE.FROM.CHINA | W6 44773 2012o SD | Not Available |
| SUBSET | Pisum Genetic Data | Accessions with Genetic Data | SNP.PSP.PLUS.COLLECTION.2017 | | A ZIP'ed TEXT file with the markers and data (7.3 Mb in size)
A ZIP'ed TEXT file with the markers and data in VCF file suffix (28 Mb in size)
Abstract:
Globally, pea (Pisum sativum L.) is an important temperate legume crop for food, feed, and fodder, and many breeding programs exist to develop cultivars adapted to these end uses. In order to manage and utilize genetic resources for pea improvement, the USDA Pea Single Plant Plus Collection (PSPPC), which contains 431 Pisum accessions with morphological, geographic, and taxonomic diversity, was assembled. To maximize the value of this collection for trait mapping and genomics-assisted breeding projects, detailed genetic characterization was performed. To that end, genotyping-by-sequencing―a cost-effective method for de novo SNP marker discovery―was used to generate 66 591 high-quality SNPs. These data allowed us to identify accessions divergent from mainstream breeding germplasm that could serve as sources of novel, favorable alleles. In particular, a group of accessions from Central Asia appeared nearly as diverse as a sister species, P. fulvum, and subspecies, P. sativum subsp. elatius. Accession genotypes can be paired with new and existing phenotype data for trait mapping; as proof-of-concept, Mendel’s A gene controlling flower color was localized to its known position. SNP data were also used to define a smaller core collection of 108 accessions with similar levels of genetic diversity as the entire PSPPC, resulting in a smaller germplasm set for research screening and evaluation under limited resources. Taken together, the results presented in this study along with the release of a publicly available SNP data set comprise a valuable resource for supporting worldwide pea genetic improvement efforts.
Michael Mazourek, Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853, USA Email: mm284@cornell.edu Phone: 607-254-7256 Fax: 607-255-6683
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