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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (11): 2108-2114.doi: 10.3724/SP.J.1006.2012.02108

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Evaluation of Drought Resistance in Rapeseed (Brassica napus L.) DH Lines at Seedling Stage

LI Zhen2,MEI Shu-Fang2,MEI Zhong2,LIU Fang1,ZHOU Guang-Sheng1,*,WU Jiang-Sheng1   

  1. 1 College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; 2 Department of Agriculture and Bioengineering, Jinhua College of Profession and Technology, Jinhua 321000, China
  • Received:2012-03-18 Revised:2012-07-05 Online:2012-11-12 Published:2012-09-10
  • Contact: 周广生, E-mail: zhougs@mail.hzau.edu.cn, Tel: 027-87281507

Abstract:

Drought stress in autumn, winter and spring has endangered the production and quality of rapeseed in China.The objective of the study was to evaluate drought resistance of the rapeseed (Brassica napus L.) DH (doubled haploid) population and screen the most drought-resistant DH lines. For phenotyping, the rapeseed lines from DH population [(Huyou 15×5900) F4 × (No2127-17×275B) F4] were grown in plastic pots. Six traits including plant height, root length, shoot dry weight (SDW), root dry weight (RDW), root/shoot ratio and total dry weight (TDW) together with DRC (drought resistance coefficient) of all the traits were used to evaluate the drought resistance of the 118 DH lines and their parents. The results showed that the six responsive traits changed significantly under the drought conditions compared with the control in the experiment and the effects of drought were much more severe on RDW than on other traits. All traits showed transgressive and continuous distribution under both drought and control conditions. The correlation among all the traits investigated in the study indicated that DRC of SDW, RDW and TDW could be used as available evaluation indices for drought resistance. Lines 032, 034, and 035 screened from the population were the most drought-resistant lines and 006, 091, and 104 were the most drought-sensitive lines.

Key words: Brassica napus, Seedling stage, Drought resistance, Evaluation index

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