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Acta Agron Sin ›› 2007, Vol. 33 ›› Issue (04): 578-582.

• ORIGINAL PAPERS • Previous Articles     Next Articles

The Difference of Autotoxic Compounds Content in Alfalfa Cultivars

LU Cheng12**,ZENG Zhao-Hai1**,ZHENG Shi-Zong2,QI Zhi-Qiang1,HU Yue-Gao1*   

  1. 1 Pasture Engineering Research Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094; 2 Zhejiang Institute of Hydraulics & Estuary, Hangzhou 310020, Zhejiang, China
  • Received:2006-06-21 Revised:1900-01-01 Online:2007-04-12 Published:2007-04-12
  • Contact: HU Yue-Gao

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Abstract:

Autotoxicity restricts the development of alfalfa industry. In North America researchers did some work on this field, but in China little work has been done about it. The objective of this research was to evaluate the differences of autotoxic compounds content in different alfalfa (Medicago sativa L.) cultivars by bioassay and high performance liquid chromatography. The results indicated that alfalfa leaf extracts inhibited the radicel growth of ‘vector’, and the treated radicels of ‘vector’ were shorter than that of control significantly (P<0.01). Fifty cultivars of alfalfa showed difference in aotutoxicity, and were divided into three categories based on the autotoxicity of their leaf extracts. Alfalfa ‘Key’ exhibited the least aotutoxicity, while ‘GS2001X’, ‘Super Apollo’, ‘Archer’, ‘NS00-32’, ‘Muye’, and ‘WL232HQ’ showed strong autotoxicity. Coumarine, o-coumaric acid, m-coumaric acid, and p-coumaric acid were detected in leaf extracts of alfalfa by high performance liquid chromatography.

Key words: Autotoxicity, Alfalfa, Bioassay

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