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Genetic diversity phylogenetic structure and development of core collections in Melilotus accessions from a Chinese gene bank

机译：中国基因库苜蓿种质的遗传多样性系统发育结构和核心种质发育

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摘要

Melilotus is an important forage legume, with high values as feed and medicine, and widely used as green manure, honey plant, and wildlife habitat enhancer. The genetic diversity, structure and subdivision of this forage crop remain unclear, and plant genetic resources are the basis of biodiversity and ecosystem diversity and have attracted increasing attention. In this study, the whole collection of 573 accessions from the National Gene Bank of Forage Germplasm (NGBFG, China) and 48 accessions from the National Plant Germplasm System (NPGS, USA) in genus Melilotus were measured with respect to five seed characters: seed length, width, width-to-length ratio, circumference and 100-seed weight. Shannon’ genetic diversity index (H’) and phenotypic differentiation (Pst) were calculated to better describe the genetic diversity. The ITS and matK sequences were used to construct phylogenetic trees and study the genetic relationships within genus Melilotu. Based on seed morphology and molecular marker data, we preliminarily developed core collections and the sampling rates of M. albus and M. officinalis were determined to be 15% and 25%, respectively. The results obtained here provide preliminary sorting and supplemental information for the Melilotus collections in NGBFG, China, and establish a reference for further genetic breeding and other related projects.
机译：蜜蜂是重要的牧草豆类，具有很高的饲料和医药价值，并广泛用作绿肥，蜂蜜植物和野生动植物栖息地的改良剂。该草料作物的遗传多样性，结构和细分尚不清楚，植物遗传资源是生物多样性和生态系统多样性的基础，并引起了越来越多的关注。在这项研究中，针对五个种子特征，测量了苜蓿属中来自全国饲草种质资源库（NGBFG，中国）的573个种质和来自国家植物种质系统（NPGS，美国）的48个种质。长，宽，宽长比，周长和100粒重。计算香农的遗传多样性指数（H'）和表型分化（Pst），以更好地描述遗传多样性。 ITS和matK序列用于构建系统进化树，并研究Melilotu属内的遗传关系。根据种子形态和分子标记数据，我们初步开发了核心种质，并将白al和厚朴的采样率分别确定为15％和25％。此处获得的结果为中国NGBFG的Melilotus采集提供了初步的分类和补充信息，并为进一步的遗传育种和其他相关项目提供了参考。

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