Poaceae(the grasses)includes rice,maize,wheat,and other crops,and is the most economically important angiosperm *** is also one of the largest plant families,consisting of over 11000 species with a global distribution...
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Poaceae(the grasses)includes rice,maize,wheat,and other crops,and is the most economically important angiosperm *** is also one of the largest plant families,consisting of over 11000 species with a global distribution that contributes to diverse *** species are classified into 12 subfamilies,with generally strong phylogenetic support for their ***,many relationships within subfamilies,among tribes and/or subtribes,remain *** better resolve the Poaceae phylogeny,we generated 342 transcriptomic and seven genomic datasets;these were combined with other genomic and transcriptomic datasets to provide sequences for 357 Poaceae species in 231 genera,representing 45 tribes and all 12 *** 1200 low-copy nuclear genes were retrieved from these datasets,with several subsets obtained using additional criteria,and used for coalescent analyses to reconstruct a Poaceae *** results strongly support the monophyly of 11 subfamilies;however,the subfamily Puelioideae was separated into two non-sister clades,one for each of the two previously defined tribes,supporting a hypothesis that places each tribe in a separate *** clock analyses estimated the crown age of Poaceae to be101 million years *** character reconstruction of C3/C4 photosynthesis supports the hypothesis of multiple independent origins of C4 *** origins are further supported by phylogenetic analysis of the ppc gene family that encodes the phosphoenolpyruvate carboxylase,which suggests that members of three paralogous subclades(ppc-aL1a,ppc-aL1b,and ppcB2)were recruited as functional C4 ppc *** study provides valuable resources and a robust phylogenetic framework for evolutionary analyses of the grass family.
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