文献类型： 外文期刊

作者： Zhou, Y. ¹ ; Zhu, H. Z. ¹ ; Cai, S. B. ¹ ; He, Z. H. ² ; Zhang, X. K.; Xia, X. C.; Zhang, G. S.;

作者机构： 1.Chinese Acad Agr Sci, Natl Wheat Improvment Ctr, Crop Sci Inst, Beijing 100081, Peoples R China; Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China; Jiangsu Acad Agr Sci, Food Crop Res Inst, Nanjing 210014, Peoples R China; CIMMYT, China Off, Beijing 100081, Peoples R China; NW Sci Tech Univ, Coll Agr, Shaanxi 712100, Peoples R China

2.Chinese Acad Agr Sci, Natl Wheat Improvment Ctr, Crop Sci Inst, Beijing 100081, Peoples R China; Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China; Jiangsu Acad Agr Sci, Food Crop Res Inst, Nanjing

关键词： bread wheat;genetic improvement;yield potential;yield components;dwarfing gene

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

ISSN： 0014-2336

年卷期： 2007 年 157 卷 3 期

页码：

收录情况： SCI

摘要： To understand the genetic gains of grain yield in the Southern China Winter Wheat Region (SCWWR), two yield potential trials, i.e., YPT 1 including 11 leading cultivars from the Middle and Low Yangtze Valley (Zone III) and YPT 2 including 15 leading cultivars from the Southwestern China Region (Zone IV) from 1949 to 2000, were conduced during the 2001-2003 cropping seasons. A completely randomized block design of three replicates was employed with controlled field environments. Molecular markers were used to detect the presence of dwarfing genes and the 1B/1R translocation. Results showed that average annual genetic gain was 0.31% (P < 0.05) or 13.96 kg/ha/year and 0.74% (P < 0.01) or 40.80 kg/ha/year in Zones III and IV, respectively. In YPT 1, changes of all other traits were not significant, but plant height was significantly reduced. In YPT 2, the genetic improvement of grain yield was primarily attributed to the increased thousand kernel weight (TKW) (0.65%, P < 0.01) and kernel weight/spike (0.87%, P < 0.01), reduced plant height and increased harvest index (HI). The dwarfing gene Rht 8 was most frequently present (46.1%), Rht-B1b was observed in three genotypes in Zone III, and Rht-D1b was present in only one genotype in Zone IV. The 1B/1R translocation was present in four genotypes. Utilization of Italian germplasm and development of landmark cultivar Fan 7 were the key factors for grain yield improvement in SCWWR. The future challenge of wheat breeding in this region is to continue improving grain yield and disease resistance, and to develop cultivars suitable for the reduced tillage of wheat/rice double cropping. Utilization of Mexican germplasm could provide opportunities for future yield improvement.