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《Acta Agrestia Sinica》 2005-04
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Studies on Cytogenetics of Elymus Dahuricus,Hordeum Brevisubulatum and Their Hybrid F_1 and BC_1

LI Zao-zhe~1,YUN Jin-feng~1,YU Zhuo~2,HE Li-jun~2(1.College of Ecology and Environmental Science;2.College of Agronomy,Inner Mongolia Agriculture University,Huhhot,Inner Mongolia Autonomous Region 010019,China)  
The chromosome number in the root tip cell and chromosome behavior at meiosis in pollen mother cell were observed and analyzed.The results showed that chromosome numbers of parents E.dahuricus and H.brevisubulatum were 42 and 28 respectively.The chromosome numbers of both E.dahurcus×H.brevisubulatum F_1 and H.brevisubulatum×E.dahuricus F_1 were 35.The chromosome numbers of BC_1 varied,ranging from 28~35,and many no-ploidy plants appeared.The bivalent pairing frequency of E.dahuricus was very high.A few tetravalents,trivalents and univalents appeared in pollen mother cells of H.brevisubulatum at metaphase I,but bivalents were dominant.The meiosis of hybrid F_1 was not regular and the general existence of univalents was the main cause of sterility of hybrid F_1.The univalent pairing frequency in pollen mother cell of BC_1 at metaphase I decreased in some extent,while the bivalent pairing frequency increased,with the bivalents in some lines becoming dominant.All this provided cytological basis for the sterility restoration of the hybrid.
【Fund】: 国家自然科学基金资助(30260074)
【CateGory Index】: S54
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