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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (1): 68-75.doi: 10.3724/SP.J.1006.2010.00068

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

Development of Cytoplasmic Male Sterile Line A2Sx3197 with Resistance to Head Smut （Sphacetheca reliana clint） and Pollen Abortion in Sorghum vulara

CHENG Qing-Jun,ZHANG Fu-Yao*,LI Tuan-Yin,LIU Qing-Shan,DU Zhi-Hong,PING Jun   

  1. Sorghum Institute of Shanxi Academy of Agricultural Science，Jinzhong 030600，China
  • Received:2009-06-17 Revised:2009-09-10 Online:2010-01-12 Published:2009-11-17
  • Contact: ZHANG Fu-Yao, E-mail: zfy5607@163.com; Tel: 0354-3963992

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Abstract:

The sorghum cytoplasmic male sterile (CMS) line A1Tx3197 was used widely in China. At the end of 1970s, this line and its hybrids gradually lost resistance to sorghum head smut because of race shift. Meanwhile, the floret abortion of this line led to low yield. Since the maintainer of A2 type CMS can restore the fertility of A1 type CMS, to improve the head smut resistance and floret fertility of A1Tx3197, BV4 with the genes conferring the head smut and floret abortion resistances was used as a donor, and A1Tx3197 was used as a recurrent parent. After five generation backcrossing, a intermediate material BSx3197 carrying head smut and floret abortion resistance genes, a maintainer for A2-CMS, was acquired. Then BSx3197 was used to replace the karyon of A2 type CMS line. Finally a novel A2 type CMS line A2Sx3197 with its maintainer BSx3197 (MS1MS1ms2ms2) was bred. The line A2Sx3197 was restorable in A1 and A5 cytoplasmic background, but sterile in A2, A3, A4, A6, 9E cytoplasmic background. The average disease incidence of A2Sx3197 was 0–0.8%, and the average abortion incidence was 0–8.4%. A2Sx3197 had significantly higher resistance to the head smut and floret abortion than A1Sx3197, which was similar with BV4. The main agronomic traits of A2Sx3197 and A1Tx3197 were not significantly different such as days of heading, plant height, spike length, spike width, 1000-grain weight, grain weight per spike, grain color, shell color, spike shape and spike type.

Key words: Sorghum, Cytoplasmic-male sterile lines, Transbreeding, Head smut resistance, Floret abortion resistance


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