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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (10): 1717-1724.doi: 10.3724/SP.J.1006.2014.01717

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

Phenotype Variation and Vertical Distribution of Foxtail Millet Root System in RIL from a Cross of Yugu 1× Wild Green Foxtail W53

ZHANG Wen-Ying1,ZHI Hui2,LIU Bin-Hui1,WANG Xue-Zheng1,PANG Zhao-Jin1,LI Ji-Ming1,WANG Guang-Cai1,LI Ming-Zhe1,WANG Yong-Fang3,LI Wei3,LI Hai-Quan3,JIA Guan-Qing2,DIAO Xian-Min2,3,*   

  1. 1 Dryland Farming Institute, Hebei Academy of Agricultural and Forestry Science, Hengshui 053000, China; 2 Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3 Institute of Millet Crops, Hebei Academy of Agricultural and Forestry Science, Shijiazhuang 050031, China
  • Received:2013-11-07 Revised:2014-07-06 Online:2014-10-12 Published:2014-07-25
  • Contact: 刁现民, E-mail: diaoxianmin@caas.cn E-mail:zxm.0223@163.com

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Abstract:

Foxtail millet is a well-known drought tolerant crop in arid and semi-arid regions, because root system plays an essential role in crop growth period. Taking 196 lines from foxtail millet RIL, derived from a cross of cultivar Yugu 1 ´ wild green foxtail W53 as materials, we investigated root system variance and distribution in the soil with the root canal soil column culture. The results showed that the average length of root per plant, the average root surface area per plant, the average root volume per plant, the average root diameter per plant and that of root dry weight per plant were 89.42 ± 32.67 m, 2.74 ± 0.93 dm2, 30.94 ± 13.93 mL, 0.52 ± 0.06 mm, and 0.98 ± 0.45 g, respectively. There existed high variation coefficients in the root characters of all lines except root diameter. The deepest root system was detected in 2.4 meters beneath the soil surface, and 90% of root biomass of foxtail millet distributed from the soil surface to the depth of 200 centimeters. The overall distribution of foxtail millet root system was a “8” type structure, which means that foxtail millet root biomass gradually decreased from the soil surface to a depth of 60 centimeters, increased slightly from soil layer of 60 centimeters to 100 centimeters, and then decreased again to zero in the deeper soil layer. The correlation analysis of root traits and agronomic traits above ground showed that plant straw weight and plant grain yield were positively correlated with root traits and the correlation coefficients could be used an indirect index for germplasm evaluation and breeding selection.

Key words: Foxtail millet, Root system, Soil layer, Recombinant inbred lines

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