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首页> 外文期刊>African Journal of Biotechnology >Provenance variation in growth and genetic potential of Aquilaria malaccensis under nursery condition
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Provenance variation in growth and genetic potential of Aquilaria malaccensis under nursery condition

机译：苗圃条件下马尾沉香生长和遗传潜力的种源变化

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Aquilaria malaccensis Lam. is commonly known as Agarwood which is distributed in the Indo-malesian genus Aquilaria of family Thymelaeaceae known to produce resin-impregnated heartwood that is fragrant and highly valuable. Agarwood is reputed to be the most expensive wood in the world. Twenty two open pollinated families in A. malaccensis were selected and evaluated for growth attributes and genetic divergence. The experiment was conducted at Forest College and Research Institute, Tamil Nadu Agricultural University; Mettupalayam situated at 11° 19’ N longitude, 76° 56’ E latitude at 300 MSL during January - December 2010. The study indicates significant differences among the selected families for various growth attributes. Among the twenty two progenies evaluated, three progenies viz., NHJA, KHOW-1 and CHEK-1 exhibited consistent superiority over growth periods for shoot length, collar diameter and number of branches. Genetic divergence studies resulted in grouping of the selected families into six clusters which indicated the existence of adequate genetic divergence. Among the clusters, cluster VI was the largest with 9 progenies while the maximum intra clusters distance was recorded in cluster V. The intra and inter cluster distance revealed that maximum inter cluster distance was recorded between cluster IV and V which indicated the presence of wide genetic distance between A. malaccensis progenies. Among the various growth attributes, number of branches contributed maximum towards genetic divergence followed by shoot length. These two characters could act as a reliable indicator for future improvement programme in this economically important species. Genetic analysis of the progenies indicated adequate variability in the population. The phenotypic co-efficient of variation (PCV) and genotypic co-efficient of variation (GCV) estimates exhibited superiority of number of branches followed by shoot length and collar diameter. In case of shoot length, collar diameter and number of branches exhibited moderate heritability. The genetic advance was high for shoot length followed by number of branches which indicated the reliability of these two parameters for inclusion in future improvement programme.
机译：马六甲沉香。俗称沉香木，分布在胸腺科的印度-马来亚沉香属中，已知其生产的树脂浸渍心材香气浓郁，价值很高。沉香被认为是世界上最昂贵的木材。选择了马六酸曲霉中的22个开放授粉科，并对其生长特性和遗传差异进行了评估。实验是在泰米尔纳德邦农业大学森林学院和研究所进行的;于2010年1月至12月，Mettupalayam位于北纬11°19′，北纬76°56′，海拔300 MSL。该研究表明，所选家庭在各种生长特征方面存在显着差异。在评估的22个子代中，NHJA，KHOW-1和CHEK-1这3个子代在苗期，枝条直径和枝条数上表现出一致的优势。遗传差异研究导致将选定的家庭分为六个集群，这表明存在足够的遗传差异。在群集中，群集VI最大，有9个子代，而群集V中记录了最大群集内距离。群集内和群集间距离显示群集IV和V之间记录了最大群集间距离，表明存在广泛的遗传马六甲曲霉后代之间的距离。在各种生长属性中，分支数量对遗传差异贡献最大，其次是枝条长度。这两个特征可以作为该经济重要物种未来改进计划的可靠指标。后代的遗传分析表明种群中有足够的变异性。表型变异系数（PCV）和基因型变异系数（GCV）估计值显示出枝条数量优势，随后是枝条长度和衣领直径。在芽长的情况下，领径和分支数表现出中等的遗传力。枝条长度的遗传进展很高，其次是枝条的数目，表明这两个参数在未来改良计划中的可靠性。

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