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Acta Prataculturae Sinica ›› 2016, Vol. 25 ›› Issue (3): 126-134.DOI: 10.11686/cyxb2015170

• Orginal Article • Previous Articles     Next Articles

Determination of general combining ability and estimation of genetic parameters for yield and quality in alfalfa

WANG Hong, SHI Shang-Li*, ZHANG Xu-Ye, ZHANG Li   

  1. College of Grassland Science, Gansu Agricultural University, Sino-US Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China
  • Received:2015-04-01 Online:2016-03-20 Published:2016-03-20

Abstract: To breed high yielding high quality alfalfa cultivars, seeds of 16 half-sib lines with good performance, obtained from the progeny of multiple crosses, were selected. General combining ability (GCA) and the broad-sense heritability (H2) for yield and quality were analyzed and evaluated. Cluster analysis was conducted based on GCA. Two genotypes with high GCA (White flower No. 3 and Fast-growing No.4) and eight strains with moderate GCA (Fast-growing No.15, Fast-growing No.12, White flower No.1, White flower No.2 and Fast-growing No.1 etc.). Strains with high yield and quality can be used as parents in the next crossing cycle. The estimated H2 values for attributes affecting relatively feeding value were in the order>hay yield>leaf-stem ratio>crude protein>branch number>internode length>plant height>growth rate. Most H2 values were >80%, which means they could be used as early generation selection indicators in a breeding programme.