Zago B W, Barelli M A A, Hoogerheide E S S, Corrêa C L, Delforno G I S, da Silva C J
Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Amazônia Legal, Rede Bionorte, , , Brasil
Departamento de Agronomia, , , Brasil.
Genet Mol Res. 2017 Aug 17;16(3):gmr-16-03-gmr.16039725. doi: 10.4238/gmr16039725.
Genetic variability of cassava (Manihot esculenta Crantz) in Brazil is wide, being this the result of natural and cultural selection during pre- and post-domestication of the species in different environments. Given the number of species of the genus found in the region (38 of a total of 98 species), the central region of Brazil was defined as the primary center of cassava diversity. Therefore, genetic diversity characterization of cassava accessions is fundamental, both for farmers and for plant breeders, because it allows the organization of genetic resources and better utilization of available genetic diversity. This research aims to assess genetic divergence of cassava accessions from the south-central region of the State of Mato Grosso, based on multi-categorical morphological traits. For this purpose, 38 qualitative and quantitative morphological descriptors were used. Genetic diversity was expressed by the genetic similarity index, with subsequent clustering of accessions by the modified Tocher's procedure and UPGMA. Of 38 descriptors, only growth habit of stem showed no variability. Tocher and UPGMA methods were efficient and corroborated on group composition. Both methods were able to group accessions of different localities in distinct group consistency.
巴西木薯（Manihot esculenta Crantz）的遗传变异性很大，这是该物种在不同环境下驯化前和驯化后的自然和人工选择的结果。鉴于在该地区发现的木薯属物种数量（总共98个物种中的38个），巴西中部地区被定义为木薯多样性的主要中心。因此，对木薯种质的遗传多样性进行表征，对农民和植物育种者来说都至关重要，因为这有助于对遗传资源进行整理，并更好地利用现有的遗传多样性。本研究旨在基于多分类形态性状评估马托格罗索州中南部地区木薯种质的遗传差异。为此，使用了38个定性和定量形态学描述符。通过遗传相似性指数来表示遗传多样性，随后通过改良的托赫尔法和UPGMA对种质进行聚类。在38个描述符中，只有茎的生长习性没有变异性。托赫尔法和UPGMA方法是有效的，并且在组群组成上得到了证实。两种方法都能够将来自不同地区的种质以不同的组群一致性进行分组。
