关键词: 象草, 产量, 生物学性状, 相关分析, 通径分析, 聚类分析

Abstract: In order to study the relationship between yield and morphological traits in napier grass,some important morphological traits including yield,leaf/stem ratio,plant height,tillers plant^-1,leaf length,leaf width,and stem diameter of 16 lines of napier grass and one purple napier grass and hybrid penisetum(pearl millet×napier grass) as control were investigated in 2007.The results were as follows: The differences were significant for investigated traits among tested lines.There were significantly positive correlations between yield and plant height,tillers plant^-1(P<0.01) and significantly negative correlations between yield and leaf length,leaf/stem ratio(P<0.01).Plant height and leaf/stem ratio had the most important contribution to yield.The tested lines were divided into four groups by clustering analysis based on dry yield,leaf/stem ratio,plant height,etc.The four groups were dwarf and numerous tillers type,semi-dwarf and more tillers type,intermediate height and less tillers type,and high plant and less tillers type.

Key words: Pennisetum purpureum Schum., Yield, Morphological traits, Correlation analysis, Path analysis, Cluster analysis