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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (10): 1782-1790.doi: 10.3724/SP.J.1006.2012.01782


Performance of Restorer Lines with Salt Tolerance in Whole Growth Period under Normal Irrigated Condition and Development of Hybrid Rice with Salt Tolerance

ZHANG Lu-Biao1,2,PAN Xiao-Biao3,ZHANG Jian2,CHEN Kai2,ZHANG Qiang2,XU Jian-Long2,*,PAN Xue-Biao1,LI Zhi-Kang2   

  1. 1Key Laboratory of Crop Genetics and Physiology of Jiangsu Province / Key Laboratory of Plant Functional Genomics of Education Ministry, Yangzhou University, Yangzhou 225009, China; 2 Institute of Crop Sciences / National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3 Crop Institute of Taizhou Academy of Agricultural Sciences of Zhejiang Province, Linhai 317000, China
  • Received:2012-03-21 Revised:2012-06-10 Online:2012-10-12 Published:2012-07-27
  • Contact: 徐建龙, E-mail: xujlcaas@yahoo.com.cn, Tel: 010-82105854


Four introgression line populations derived from the recurrent parent Minghui 86 and four donor parents (Gayabyeo, Shennong 265, Zaoxian 14, and Y134) were screened and evaluated for salt tolerance (ST) under the stress of 0.5% salt concentration over the whole growth stages in Sanmen county of Zhejiang province, so that a total of 150 restorer lines with ST were selected. In this study, the 150 restorer lines with ST and their test-crossing hybrids with cytoplastic male sterile lines II-32A and Chuan 345A were investigated for grain yield and its related agronomic traits under normal irrigated condition. Segregations presented in yield and its related traits among those lines, showing various types with different populations and traits. Thirty promising restorer lines with significantly higher yield and ST were selected. Most of them showed a decrease in panicle length (PL), plant height (PH), and thousand grain weight (TGW), but significantly increased panicle number per plant (PNP) and seed setting rate (SSR), thus resulting in significantly higher yield. As compared with hybrids crossed between Minghui 86 and the two sterile lines, test-crossing populations derived from the crosses between the restorer lines with ST and the two sterile lines showed shorten PL and PH, similar PNP, but significantly increased TGW when tested with II-32A, indicating there were partial differences in trait performance between salt-tolerant restorer lines and their hybrids. Twenty-two and 23 hybrid combinations showed stronger heterosis as compared with the hybrids derived from Minghui 86 and the two corresponding sterile lines. Among them, seven (from II-32A) and four (from Chuan 345A) hybrids significantly surpassed the commercial check combination Shanyou 10 in yield. It was indicated that ST screening in the field under salt stress combined with selections of yield and its related traits in normal irrigated condition for introgression line populations with an elite restorer background will efficiently improve the ST of restorer lines and possibly facilitate to develop the ST-improved hybrid rice.

Key words: Rice, Salt tolerance, Test cross, Restorer line, Heterosis

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