Report on domestication and breeding of Phalaris arundinacea'Chuanxi'
In response to the scarcity of grass species for ecological restoration in wetland management,we initiated the collection and evaluation of wild reed grass resources with waterlogging tolerance and cold resistance characteristics since 2007.After three generations of selection based on agronomic traits and stress resistance,a new Chuanxi reed grass variety with consistent phenology and stable characteris-tics was finally selected.Comparative trials were conducted from 2016 to 2018,followed by regional and production trials from 2019 to 2021.In 2022,the variety was officially registered and approved by the National Forestry and Grassland Administration Variety Approval Committee as Phalaris arundinacea'Chuanxi'(Variety Code:National S-WDV-PA-006-2022).This variety exhibits a well-devel-oped root system,high restoration efficiency,good waterlogging tolerance,strong cold resistance,and abundant leaf production.Its resto-ration efficiency is 318 days,which is 12 days and 27 days less than the original population and Phalaris arundinacea L.'Chuancaoyin No.3',respectively.The survival rate under20 daysof waterloggingstressis100%.Theaveragedryhayyieldis17,168 kg/ha,repre-senting an increase of 11.9%compared to the control variety'Chuancaoyin No.3'.The crude protein content during the early flowering stage is11.8%,which is2 percentage points higher than the control variety'Chuancaoyin No.3'.In conclusion,Phalaris arundinacea'Chuanxi'is an excellent new variety suitable for ecological restoration and forage use.It is primarily used for the ecological restoration of degraded wetlands and grasslands in the west Sichuan Plateau and southwestern regions,and can also be used for establishing high-yield artificial grasslands.
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