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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (12): 2152-2159.doi: 10.3724/SP.J.1006.2008.02152

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

Evaluation of Phosphorus Efficiency in Rapeseed (Brassica napus L.) Recombinant Inbred Lines at Seedling Stage

ZHANG Hai-Wei1,HUANG Yu1,YE Xiang-Sheng1,XU Fang-Sen12*   

  1. 1 Microelement Research Center, Huazhong Agricultural University; 2 National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, Hubei, China
  • Received:2008-05-06 Revised:2008-07-15 Online:2008-12-12 Published:2008-10-10
  • Contact: XU Fang-Sen

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Abstract:

Phosphorus (P) is one of the necessary mineral nutrients for plants. Despite high concentrations of total P in soil, its bio-available concentration is very low compared to the requirement of plants and soil organisms. P deficiency is a major factor limiting plant growth and productivity worldwide. The plant species or cultivars show significant difference in accumulation and utilizing soil P, thus, developing P-efficient crops has been proposed as an available strategy to improve the fertilizer use efficiency or to obtain high yields in low input agricultural systems. The aim of the study was to evaluate P efficiency of 135 recombinant inbred lines (RIL) derived from a cross between P-efficient cultivar and P-inefficient cultivar of rapeseed (Brassica napus L.) through investigating shoot dry weight (SDW), root dry weight (RDW), root/shoot-ratio (R/S), average maximal root length (AMRL), shoot phosphorus uptake (SPU), total phosphorus uptake (TPU) and P use efficiency (PUE) at the seedling stage in a solution culture experiment with low P (P1, 5 μmol L-1) and normal P treatments (P2, 1 000 μmol L-1). The correlation between the tested traits and P efficiency among the RIL was analyzed. The results showed that 1) low-P stress limited seriously plant growth at seedling stage, and there existed significant differences among the genotypes of the RIL compared with normal P treatment; 2) all of the four traits, SDW, RDW, R/S, and AMRL, showed normal distribution in the RIL under both P treatments and presented significant transgressive segregation; and 3) the correlation among the seven traits investigated in the study indicated that relative SDW and RDW could be used as available evaluation indices for P efficiency but the effect of genetic factor should be considered at the same time; 4) on the basis of the screening indexes, genotypes with extremely high P efficiency were screened from the population, but they should be identified on low-P soil further.

Key words: Low-P stress, Rapeseed, P efficiency, Evaluation index, Seedling stage

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