Pogostemon cablin, commonly known as Patchouli (family-Lamiaceae) is a perennial aromatic herb with many medicinal properties and has immense use in different pharmaceutical industries. In this study genetic variability and association studies were performed for 200 M₄ population derived from chemical and physical mutagenic agents. The trial was planted in Randomized Block Design and eleven morphological and quality characters were taken for the study during the year 2020. Analysis of variance (ANOVA) showed high phenotypic and genotypic coefficient of variation (PCV, GCV) for fresh herbage yield per plant, number of monopodia and number of sympodia. High heritability with high genetic advance was observed for the characters, like-length of sympodia (86.703, 28.942), plant height (86.001, 27.439). Correlation study revealed that length of sympodia has significant positive correlation with dry weight of herbage yield/plant, while essential oil yield percentage showed significant negative correlation with fresh herbage yield and dry herbage yield per plant. Patchouli alcohol percentage was also found to be significant and negatively correlated with fresh herbage yield and dry herbage yield per plant. Path coefficient study showed fresh herbage yield/plant to have highest positive direct effect (0.628) on dry weight of herbage yield/plant, while length of monopodia showed highest positive direct effect (0.120) on essential oil percentage. Genetic divergence study partitioned the genotypes into eight clusters, thereby showing great variability among them for the studied traits. So, for increasing essential oil quality characters like- number of sympodia and number of monopodia should be considered and for increasing herbage yield quality, length of sympodia should be taken as selection criteria.

Pogostemon cablin ，俗称广藿香（唇形科），是一种多年生芳香草本植物，具有多种药用价值，在不同的制药行业有广泛的用途。在这项研究中，对来自化学和物理诱变剂_{的 200 M 4种群}进行了遗传变异性和关联研究。该试验采用随机区组设计，并在 2020 年为研究采集了 11 个形态和质量特征。方差分析 (ANOVA) 显示每株新鲜草本产量的表型和基因型变异系数 (PCV、GCV) 较高，单足的数量和sympodia的数量。高遗传力株高(86.703, 28.942),株高(86.001, 27.439)等性状具有较高的遗传进展。相关性研究表明，茎秆长度与草本产量/株干重呈显着正相关，而精油产量百分比与鲜草产量和单株干草产量呈显着负相关。还发现广藿香酒精百分比与每株新鲜牧草产量和干牧草产量呈显着负相关。路径系数研究表明，新鲜牧草产量/植物对牧草产量/植物干重的正向直接影响最高（0.628），而单足长度对精油百分比的正向直接影响最高（0.120）。遗传分歧研究将基因型划分为八个簇，从而在所研究的性状中显示出很大的变异性。因此，为了提高精油的质量特性，如集束器的数量和单叶器的数量，以及为了提高草本产量质量，应将集束器的长度作为选择标准。