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为研究烟草主要农艺性状的遗传变异规律,揭示烟草生长过程中性状间的相互作用.本研究选用'粤烟98'×'118-3'为亲本建立的135 份单粒重组自交系(RIL)群体作材料,在大田生长后期测量各株系的茎高、茎围、节距、叶数和最大腰叶的长、宽及重等7 个农艺性状,并采用相关分析、偏相关分析、线性回归分析和通径分析等方法来探究性状间的关系.结果表明,7 个性状的广义遗传力依次为:茎围＞茎高＞叶数＞最大腰叶长＞最大腰叶重＞节距＞最大腰叶宽.相关分析发现27 对性状中有17 对存在显著或极显著相关,而偏相关分析中仅显示7 对性状存在极显著相关;茎高、节距和叶数存在良好的线性关系,构建的回归模型拟合度高达96.7％.通径分析发现性状间直接和间接作用的总效果都为正贡献.本研究通过探讨两个性状间和多个性状间的内在联系,为烟草的早期选择和关联选择提供了更充分的依据,有利于提高育种效率.“,”In order to study the genetic variation law of tobacco main agronomic traits and reveal the interaction between characters in tobacco growth,a group of 135 single seed descent of recombinant inbred lines (RIL) groups,which were established by using 'Yueyan 98'×'118-3' as the parents,were selected as materials.We measured seven agronomic traits of RIL in the late field growth period,including stem height,stem girth,pitch,leaf number as well as the length,width and weight of the maximum waist leaf.In addition,correlation and partial correlation analysis,linear regression analysis and path analysis were used to explore the relationship between characters.The results showed that the broad-sense heritability of seven traits was stem girth ＞ stem height ＞ leaf number ＞ maximum waist leaf length ＞ maximum waist leaf weight ＞ pitch ＞ maximum waist leaf width.Correlation analysis found that in 27 pairs of traits,17 pairs has significant or extremely significant correlation,while in partial correlation analysis,only 7 pairs of traits had extremely significant correlation.Besides,stem height,pitch and number of leaves had a good linear relationship and the fitting degree of the constructed regression model was up to 96.7％.Path analysis indicated that both the direct and indirect effects of traits were positive.This study provided more adequate reference for the early selection and association selection of tobacco by exploring the intrinsic relationship between two traits and multiple traits,which was beneficial to improve the breeding efficiency.