Web URL(s): http://www.grasslandoregon.com/assets/molecular-breeding-of-forage-and-turf.pdf#page=65 Publication Type:
i
Report Author(s): Huff, David R. ;
Mao, Qing ;
La Mantia, Jonathan M. Author Affiliation: Pennsylvania State University, University Park, Pennsylvania Title: Genomic and phenotypic instabilities in Poa annua L. Section: Other invited oral presentation abstractsOther records with the "Other invited oral presentation abstracts" Section Meeting Info.: Salt Lake City, Utah: June 4-7, 2012 Source: Proceedings of the 7th International Symposium on the Molecular Breeding of Forage and Turf . 2012, p. 65.# of Pages: 1 Publishing Information: s.l.: s.n. Keywords: TIC Keywords: Evolution ; Genetic analysis ; Poa annua ; Poa infirma ; Poa supina ; Weed profile Abstract/Contents: "Poa annua L. is one of the world's most widely distributed plant species and is ecologically and economically important both as a weed and as a forage and turfgrass; however, little information is available concerning the genetics of this species for breeding purposes. We used single copy nuclear DNA sequences trx and CDO504 and chrolopast sequences ndhF and trnTLF to discern the evolutionary origin of Poa annua from all other possible origins. We show that at least two interspecific hybridizations between the maternal annual species Poa infirma and the paternal perennial species Poa supina gave rise to present-day Poa annua. Following this result, we were able to re-examine previously published cytological data from amphihaploids and present evidence for the genomic designations of Poa infirma as II and Poa supina as SS, making the genomic constitution of the allotetraploid Poa annua as IISS. As a species, Poa annua is most prevalent as an invasive, annual weed in ecosystems world-wide but there is also a dwarf perennial greens-type form that produces high turf quality with great utility to the golf industry. We characterized the morphological traits of the greens-type phenotype and investigated its inheritance and stability through genetic crosses. We found that the greens-type phenotype links to a single genetic mechanism. However, in advanced-generation progeny, the segregation of the greens-type phenotype does not conform to the disomic single-gene inheritance model. Additional models including tetrasomic inheritance, gene complementation, and quantitative inheritance models were also not applicable. These crossing results, along with the observation of somatic reversions, suggest that the greens-type phenotype is unstable and may be regulated by an epigenetic mechanism. Overall, our results place new emphasis on the extensive chromosomal rearrangements that took place during Poa annua's evolutionary origin as the underlying cause of epigenetic modification of the greens-type phenotype." Language: English References: 0 Note: This item is an abstract only! ASA/CSSA/SSSA Citation (Crop Science -Like - may be incomplete ): Poa annua L.. Proceedings of the 7th International Symposium on the Molecular Breeding of Forage and Turf .Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=274905 If there are problems with this record, send us feedback about record 274905 . Choices for finding the above item : Web URL(s): http://www.grasslandoregon.com/assets/molecular-breeding-of-forage-and-turf.pdf#page=65 Find from within TIC: Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)
