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您的检索式：作者名="Michael D.Windham"
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| 1 | Genome structure and apomixis in Phoenicaulis(Brassicaceae;Boechereae)显示文摘Apomixis in crucifer(Brassicaceae)species is rare,reported in just four genera(Boechera,Draba,Erysimum,and Parry a),and one intergeneric hybrid(Raphanobrassica).It is well studied only in Boechera,where it is widespread among 100+recognized species.However,its occurrence in related genera of the tribe Boechereae has not been documented previously.Here we analyzed genome evolution,mode of reproduction,and fertility of the monospecific Boechereae genus Phoenicaulis(P.cheiranthoides),endemic to the northwestern United States.We discovered that the species encompasses diploid(2n=2x=14),triploid(2n=3x=21),and tetraploid(2n=4x=28)populations.Comparative chromosome paining analyses revealed that the three karyotypes are essentially structurally identical,differing only in the presence of a largely heterochromatic chromosome(Het)in the triploid and tetraploid cytotypes.The genome structure of Phoenicaulis appeared identical to that of Boechera species previously analyzed,sugges廿ng genomic stasis despite the morphological and molecular divergence of the two genera.This genome colinearity extended to the presenee and structure of the Het chromosomes,which are closely associated with apomictic reproduction in Boechera.Interestingly,all three cytotypes of Phoenicaulis proved to be apomictic,regardless of the presenee or absence of a Het chromosome,and sexual populations have yet to be identified. | Terezie Mandakova Kaylynn Ashby Bo J.Price Michael D.Windham John G.Carman Martin A.Lysak | 2021 | Journal of Systematics and Evolution2021，59，1： | 0 |
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