Discovery and characterization of sweetpotato's closest tetraploid relative.

Discovery and characterization of sweetpotato's closest tetraploid relative.
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甘薯最接近的四倍体亲属的发现和表征。

DOI:
10.1111/nph.17991
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发表时间:
2022-05
期刊:
影响因子:
9.4
通讯作者:
Scotland, Robert W.
Scotland, Robert W.
中科院分区:
生物学1区
文献类型:
--
作者:
Munoz-Rodriguez, Pablo;Wells, Tom;Wood, John R., I;Carruthers, Tom;Anglin, Noelle L.;Jarret, Robert L.;Scotland, Robert W.

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甘薯是一种六倍体物种,其起源知之甚少,部分原因是其四倍体祖先的身份仍然未知。在这项研究中,我们确定,描述和描述一个新的品种的Ipomoea,是甘薯的最接近的四倍体的相对已知的日期,可能是其四倍体祖先的直系后代。我们整合了对六倍体甘薯、其已知最接近的二倍体近缘植物三裂叶牵牛以及来自美洲大陆的与它们密切相关的各种四倍体植物的标本馆和种质资源的形态学、系统发育和基因组分析。我们确定了野生同源四倍体植物从厄瓜多尔是形态上不同的甘薯和I. trifida,但单系和姐妹I. batatas在核数据的系统发育分析。我们将该新种命名为Ipomoea aequatoriensis T.威尔斯& P. Muñoz sp. nov.,将其与在墨西哥收集的杂交四倍体材料区分开来,并表明它可能在甘薯六倍体基因组的起源中发挥了直接作用。这一发现改变了我们对甘薯起源的理解。另见Särkinen等人对这一条款的评注,234:1107-1108。
The origin of sweetpotato, a hexaploid species, is poorly understood, partly because the identity of its tetraploid progenitor remains unknown. In this study, we identify, describe and characterize a new species of Ipomoea that is sweetpotato’s closest tetraploid relative known to date and probably a direct descendant of its tetraploid progenitor. We integrate morphological, phylogenetic, and genomic analyses of herbarium and germplasm accessions of the hexaploid sweetpotato, its closest known diploid relative Ipomoea trifida, and various tetraploid plants closely related to them from across the American continent. We identify wild autotetraploid plants from Ecuador that are morphologically distinct from Ipomoea batatas and I. trifida, but monophyletic and sister to I. batatas in phylogenetic analysis of nuclear data. We describe this new species as Ipomoea aequatoriensis T. Wells & P. Muñoz sp. nov., distinguish it from hybrid tetraploid material collected in Mexico; and show that it likely played a direct role in the origin of sweetpotato’s hexaploid genome. This discovery transforms our understanding of sweetpotato’s origin. See also the Commentary on this article by Särkinen et al., 234: 1107–1108.
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