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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (7): 1261-1267.doi: 10.3724/SP.J.1006.2009.01261

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Segregation of Chromosomes and Traits of Hybrid Generations Derived from Cross between Triticum aestivum and Amphidiploid of Aegilops ventricosa X Aegilops cylindrica

WANG Yu-Hai1,4,WANG Li-Ming5,BAO Yin-Guang1,CUI Fa1,HAO Yuan-Feng1,ZONG Hao1,LI Xing-Feng1,GAO Ju-Rong1,WANG Hong-Gang123*   

  1. 1State Key Laboratory of Crop Biology,Shandong Agricultural University,Tai'an 271018,China;2Agronomy College of Shandong Agricultural University,Tai'an 271018,China;3Subcenter of National Wheat Improvement Center,Tai'an 271018,China;4Zaozhuang College,Zaozhuang 277100,China;5College of Agronomy,Henan Science and Technology University,Luoyang 471003,China
  • Received:2008-11-28 Revised:2009-03-23 Online:2009-07-12 Published:2009-05-19
  • Contact: WANG Hong-Gang, E-mail: hgwang@sdau.edu.cn
  • About author:E-mail: yhwang92@163.com

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Abstract:

SDAU18 is an amphidiploid derived from the cross between Aegilops ventricosa and Ae. cylindrical, which carries excellent traits from the both parents. Because of the good crossability with common wheat (Triticum aestivum L.), it also acts as a bridge material to transfer objective genes from Ae. ventricosa and Ae. cylindrical to improved wheat cultivarsthrough hybridization. To disclose the chromosome segregation of hybrid progenies derived from common wheat ´ SDAU18 cross, we used a common wheat cultivar Yannong 15 as female parent and recurrent parent to develop hybrid generations F1, F2, F3, F4, F5, BC1F1, BC2F1, BC3F1, and BC1F2. The mitosis in root tip cells and meiosis in pollen mother cells were observed. Agronomic traits, such as plant height, spike length, spikelet number per spike, grain number per spike, and seed-setting rate were also investigated in BC1F1, BC2F1, and BC3F1 generations. In higher generations of selfing and backcross, the chromosome number gradually decreased and eventually tended to 42, which was the same as common wheat. Backcrossing was able to fasten the process than selfing. In the F5 and BC3F1 generations, plants with 42 chromosomes were accounted for 93.9% and 92.0%, respectively. Chromosome configuration in PMCs MI was simpler in backcross generations than in selfing ones. Compared with the BC1F1 and BC2F1 generations, BC3F1 showed less diversity in chromosome configuration, indicating that excessive backcross resulted in less chromosomes recombination between SDAU18 and common wheat. Two or three rounds of backcross were feasible. With the increasing generation of selfing and backcross, fertility of the hybrid was improved till the stable status in F3 and BC2F1 generations. In various generations, variant plants with excellent traits were found, such as dwarf plant, huge spike, large grain, high resistance or immunity to powdery mildew and stripe rust, and good appearance of grain. In particular, the F3 and BC1F1 generations had the most variation types.

Key words: Aegilops ventricosa, Aegilops cylindrica, Amphidiploid, Wheat, Hybrid progenies, Chromosome segregation

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