Contrasting patterns of variation in weedy traits and unique crop features in divergent populations of US weedy rice (Oryza sativa sp.) in Arkansas and California
Autor: | William C. Bridges, Nilda R. Burgos, Cynthia C. Vigueira, Amy Lawton-Rauh, Aída Ortiz, Kimberly L. Kanapeckas, Albert J. Fischer, Te-Ming Tseng |
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Rok vydání: | 2018 |
Předmět: |
0301 basic medicine
Oryza sativa biology Ecotype food and beverages 04 agricultural and veterinary sciences General Medicine Oryza biology.organism_classification Crop 03 medical and health sciences 030104 developmental biology Agronomy Insect Science 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Paddy field Weed Agronomy and Crop Science Panicle Weedy rice |
Zdroj: | Pest Management Science. 74:1404-1415 |
ISSN: | 1526-498X |
Popis: | Author(s): Kanapeckas, Kimberly L; Tseng, Te-Ming; Vigueira, Cynthia C; Ortiz, Aida; Bridges, William C; Burgos, Nilda R; Fischer, Albert J; Lawton-Rauh, Amy | Abstract: Weed evolution from crops involves changes in key traits, but it is unclear how genetic and phenotypic variation contribute to weed diversification and productivity. Weedy rice is a conspecific weed of rice (Oryza sativa) worldwide. We used principal component analysis and hierarchical clustering to understand how morphologically and evolutionarily distinct US weedy rice populations persist in rice fields in different locations under contrasting management regimes. Further, we used a representative subset of 15 sequence-tagged site fragments of expressed genes from global Oryza to assess genome-wide sequence variation among populations.Crop hull color and crop-overlapping maturity dates plus awns, seed (panicle) shattering (g 50%), pigmented pericarp and stature variation (30.2% of total phenotypic variance) characterize genetically less diverse California weedy rice. By contrast, wild-like hull color, seed shattering (g 50%) and stature differences (55.8% of total phenotypic variance) typify genetically diverse weedy rice ecotypes in Arkansas.Recent de-domestication of weedy speciesn-nsuch as in California weedy ricen-ncan involve trait combinations indistinguishable from the crop. This underscores the need for strict seed certification with genetic monitoring and proactive field inspection to prevent proliferation of weedy plant types. In established populations, tillage practice may affect weed diversity and persistence over time. © 2017 Society of Chemical Industry. |
Databáze: | OpenAIRE |
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